Understanding the Nissan P1443 Diagnostic Trouble Code

The P1443 diagnostic trouble code is a manufacturer-specific code that primarily affects Nissan and Infiniti vehicles. This code indicates a malfunction in the Evaporative Emission Control (EVAP) system, specifically related to the canister vent control valve circuit. The EVAP system is crucial for preventing fuel vapors from escaping into the atmosphere, making this code directly related to your vehicle’s emissions compliance and environmental impact.

What Does P1443 Mean in Nissan Vehicles?

P1443 specifically points to an electrical issue within the canister vent control valve circuit. This valve, typically located near the fuel tank or charcoal canister, is responsible for managing the flow of fresh air into the EVAP system and controlling the purging of fuel vapors. When the Powertrain Control Module (PCM) detects an irregular voltage, resistance, or signal in this circuit that falls outside predetermined parameters, it stores the P1443 code and illuminates the check engine light.

The Role of the EVAP System in Modern Nissans

Modern Nissan vehicles employ sophisticated EVAP systems to meet stringent emission standards. The system captures fuel vapors from the fuel tank and stores them in the charcoal canister. During specific engine conditions, the PCM activates the vent control valve and purge valve to direct these vapors into the engine for combustion. The P1443 code directly impacts this process, potentially allowing fuel vapors to escape or creating operational issues.

Common Symptoms of P1443 Code in Nissan Vehicles

Recognizing the symptoms associated with P1443 is crucial for timely diagnosis and repair. While some vehicles may only display a check engine light, others exhibit more noticeable driving characteristics that can help technicians pinpoint the issue more accurately.

Check Engine Light and Fuel System Indicators

The most immediate and consistent symptom is the illumination of the check engine light on your dashboard. In some Nissan models, you might also notice:

• Persistent check engine light (MIL) illumination
• Failed emissions testing during inspection
• Difficulty refueling due to premature pump shut-off
• Fuel odor around the vehicle, particularly near the fuel tank

Performance and Operational Symptoms

While the P1443 code doesn’t typically cause significant drivability issues, some vehicle operators report subtle changes in operation:

• Slight decrease in fuel economy due to improper vapor management
• Rough idle in some cases when the EVAP system affects air-fuel ratio
• Unusual sounds from the fuel tank area during engine operation
• Extended cranking time before engine startup

Primary Causes of P1443 Code in Nissan Models

Diagnosing the root cause of P1443 requires systematic testing of several components within the EVAP system. Understanding these potential causes helps technicians develop an efficient diagnostic strategy.

Electrical Circuit Failures

The most common causes involve electrical issues within the vent control valve circuit:

• Failed or stuck EVAP canister vent control valve/solenoid
• Damaged wiring or connectors in the control circuit
• Blown fuse affecting the EVAP system operation
• Poor electrical connections or corrosion at connector terminals
• Short to ground or open circuit in the control wiring

Mechanical and Component Failures

Physical damage or wear can also trigger the P1443 code:

• Clogged or restricted vent line preventing proper airflow
• Damaged charcoal canister affecting overall system function
• Physical damage to the vent valve from road debris or impact
• Contaminated vent valve preventing proper operation
• Age-related deterioration of EVAP system components

Step-by-Step Diagnostic Procedure for P1443

Proper diagnosis of P1443 requires methodical testing using appropriate tools and following manufacturer-specific procedures. This systematic approach ensures accurate identification of the root cause.

Initial Inspection and Visual Checks

Begin with a thorough visual inspection of the EVAP system components:

• Locate the vent control valve (typically near the fuel tank or charcoal canister)
• Inspect wiring harness for damage, chafing, or burnt insulation
• Check electrical connectors for corrosion, bent pins, or poor seating
• Examine vacuum lines for cracks, disconnections, or deterioration
• Look for physical damage to the canister and surrounding components

Electrical Circuit Testing

Using a digital multimeter, perform comprehensive electrical tests:

• Check power and ground circuits at the vent control valve connector
• Measure resistance of the vent control valve solenoid (compare to specifications)
• Test for short to ground or open circuit in control wires
• Verify PCM output signals using appropriate scan tool data
• Check related fuses and relay operation in the EVAP system circuit

Repair Procedures and Solutions for P1443

Once diagnosis is complete, implementing the correct repair is essential for permanent resolution. The specific repair will depend on the identified root cause during diagnostic testing.

Component Replacement Guidelines

Common repair procedures for resolving P1443 include:

• Replacing the faulty EVAP canister vent control valve
• Repairing or replacing damaged wiring harness sections
• Cleaning or replacing corroded electrical connectors
• Replacing blown fuses and identifying the cause of the overload
• Installing new vacuum lines if deterioration is found

Post-Repair Verification and System Testing

After completing repairs, thorough verification is crucial:

• Clear the diagnostic trouble codes using your scan tool
• Perform a drive cycle to allow the PCM to run complete system tests
• Verify that the check engine light remains off during operation
• Use a scan tool to monitor EVAP system readiness monitors
• Confirm proper operation through live data parameter observation

Preventive Maintenance and Long-Term Considerations

Preventing recurrence of P1443 and maintaining EVAP system health requires attention to several maintenance aspects that many vehicle owners overlook.

EVAP System Maintenance Best Practices

Extend the life of your Nissan’s EVAP system with these practices:

• Avoid overfilling the fuel tank during refueling
• Ensure the gas cap is properly tightened after refueling
• Address other EVAP-related codes promptly to prevent system strain
• Keep the area around the fuel tank and canister clear of debris
• Have the EVAP system inspected during routine maintenance

While P1443 is generally not an emergency repair, addressing it promptly prevents potential emissions test failures and ensures your Nissan operates as designed. The complexity of modern EVAP systems makes professional diagnosis advisable for most vehicle owners, though experienced DIY technicians with proper tools can successfully resolve this issue following the systematic approach outlined above.

How severe is this DTC?

An incorrect air/fuel ratio can result from insufficient fuel or excess air (vacuum). A P219B code should be classified as severe and corrected as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P219B fault code may include:

• Reduced fuel efficiency
• Lack of overall engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

• Engine vacuum leak (large)
• Faulty oxygen sensor(s)
• Burned, chafed, broken, or disconnected wiring and/or connectors
• Engine exhaust leaks
• A faulty mass airflow or manifold air pressure sensor
• Bad fuel pump or clogged fuel filter

What are the troubleshooting steps for P219B?

All misfire codes, throttle position sensor codes, manifold air pressure codes, and mass airflow sensor codes should be addressed before attempting to diagnose a P219B code. The engine must also be running properly and efficiently. If it is determined that there is a rich or lean condition (with the engine), this must be repaired as it may be the cause of the P219B being stored.

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P219B code.

You can save time by searching for Technical Service Bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may actually be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P219B to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

If the engine is running correctly and the P219B code continues to reset, start the engine and let it reach its normal operating temperature. Let the engine idle (with the transmission in neutral or park). With the scanner connected to the vehicle’s diagnostic port, observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data, and you will get a faster response.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good running condition.

In most cases, you will fix this code by correcting a rich or lean running engine.

How severe is this DTC?

Cylinder imbalance can be caused by a mechanical or electrical issue. A P219C code should be classified as severe and rectified as quickly as possible.

What are some of the symptoms of the code?

Symptoms of a P219C fault code may include:

• Reduced fuel efficiency
• A lack of overall engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

• Inadequate engine compression
• Faulty oxygen sensor(s)
• Faulty CKP or CMP sensor
• Burned, rubbed, broken, or disconnected wiring and/or connectors
• A faulty mass airflow or manifold air pressure sensor
• Bad fuel pump or clogged fuel filter

What are the troubleshooting steps for P219C?

All misfire codes, throttle position sensor codes, manifold air pressure codes, and mass airflow sensor codes should be addressed before attempting to diagnose a P219C code. The engine must also be running properly and efficiently. If it is determined that there is a rich or lean condition (with the engine), this must be repaired as it may be the cause of the P219C being stored.

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P219C code. A digital oscilloscope will be helpful when testing the CKP and CMP sensor output.

You can save time by searching for Technical Service Bulletins (TSBs) that reproduce the recorded code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it could provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode. The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P219C to be stored may need to worsen before an accurate diagnosis can be made.

If the code is immediately reset, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location charts, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

If the engine runs smoothly and the P219C code persists, start the engine and let it reach its normal operating temperature with the engine idling and the transmission in neutral or park. With the scanner connected to the vehicle’s diagnostic port, observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you will get a faster response. If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable) compared to the pre-cat sensors). Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

Use the oscilloscope to test for voltage spikes or noise in the CKP and CMP sensor inputs.

In most cases, you will fix P219C by correcting an engine mechanical failure

How severe is this DTC?

Cylinder imbalance can be caused by a mechanical or electrical issue. A P219D code should be classified as severe and rectified as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P219D fault code may include:

• Reduced fuel efficiency
• Lack of overall engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

• Inadequate engine compression
• Faulty oxygen sensor(s)
• Faulty CKP or CMP sensor
• Burned, rubbed, broken, or disconnected wiring and/or connectors
• A faulty mass airflow or manifold air pressure sensor
• Bad fuel pump or clogged fuel filter

What are the troubleshooting steps for P219D?

All misfire codes, throttle position sensor codes, manifold air pressure codes, and mass airflow sensor codes should be addressed before attempting to diagnose a P219D code. The engine must also be running properly and efficiently. If it is determined that there is a rich or lean condition (with the engine), this must be repaired as it may be the cause of the P219D being stored.

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P219D code. A digital oscilloscope will be helpful when testing the CKP and CMP sensor output.

You can save time by searching for technical service bulletins (TSBs) that match the recorded code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode. The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P219D to be stored may need to worsen before an accurate diagnosis can be made.

If the code is immediately reset, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and the vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

If the engine runs smoothly and the P219D code persists, start the engine and let it reach its normal operating temperature with the engine idling and the transmission in neutral or park. With the scanner connected to the vehicle’s diagnostic port, observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data, and you will get a faster response. If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

Use the oscilloscope to test for voltage spikes or noise in the CKP and CMP sensor inputs.

In most cases, you will fix P219D by correcting an engine mechanical fault…

How severe is this DTC?

Cylinder imbalance can be caused by a mechanical or electrical issue. A P219E code should be classified as severe and rectified as quickly as possible.

What are some symptoms of the code?

Symptoms of a P219E fault code may include:

• Reduced fuel efficiency
• Lack of overall engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes of this code may include:

• Inadequate engine compression
• Faulty oxygen sensor(s)
• Faulty CKP or CMP sensor
• Burned, rubbed, broken, or disconnected wiring and/or connectors
• A faulty mass airflow or manifold air pressure sensor
• Bad fuel pump or clogged fuel filter

What are the troubleshooting steps for P219E?

All misfire codes, throttle position sensor codes, manifold air pressure codes, and mass airflow sensor codes should be addressed before attempting to diagnose a P219E code. The engine must also be running properly and efficiently. If it is determined that there is a rich or lean condition (with the engine), this must be repaired as it may be the cause of the P219E being stored.

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P219E code. A digital oscilloscope will be helpful when testing the CKP and CMP sensor output.

You can save time by searching for Technical Service Bulletins (TSBs) that match the recorded code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it could provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode. The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P219E to be stored may need to worsen before an accurate diagnosis can be made.

If the code is immediately reset, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location charts, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

If the engine runs smoothly and the P219E code persists, start the engine and let it reach its normal operating temperature with the engine idling and the transmission in neutral or park. With the scanner connected to the vehicle’s diagnostic port, observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you will get a faster response. If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

Use the oscilloscope to test for voltage spikes or noise in the CKP and CMP sensor inputs.

In most cases, you will fix P219E by correcting an engine mechanical fault.

Code P219F indicates a cylinder imbalance, often related to irregular combustion or a mechanical/electrical failure. This issue can damage the engine and catalytic converter if not addressed promptly.

---

Code Severity

• Risk Level: High (requires immediate attention).
• Consequences:
  • Catalytic converter overheating.
  • Premature wear of piston rings or cylinder liners.
  • Risk of engine stalling or failure.

---

Common Symptoms

• Check engine light on (with associated codes: P0300-P0308, P0171/P0172).
• Loss of power and jerking during acceleration.
• Increased fuel consumption (+10-20%).
• Unstable idle (unusual vibrations).

---

Main Causes

Mechanical Issues

• Uneven compression: Worn piston rings, deformed valve, faulty head gasket.
• Ignition problems: Faulty spark plugs, coils, or injectors.

Electrical/Electronic Failures

• Faulty sensors:
  • Oxygen sensor (O2): Incorrect signal disrupting air-fuel mixture.
  • CKP/CMP sensor: Incorrect camshaft or crankshaft timing.
  • MAF or MAP sensor: Incorrect air measurements.
• Damaged wiring: Chafed wires, corroded connectors.

Fuel Problems

• Weak fuel pump: Insufficient pressure (test with a pressure gauge).
• Clogged fuel filter: Restricted flow to injectors.

---

Diagnostic Steps

1. Read associated codes:
   • Prioritize misfire codes (P030X) or sensor codes (MAF, O2).
2. Inspect ignition system:
   • Test spark plugs, coils, and injectors with an ohmmeter or noid light.
3. Check compression:
   • Use a compression tester (max. 10% difference between cylinders).
4. Analyze sensors:
   • Oscilloscope: Check CKP/CMP signals (no interference).
   • OBD2 scanner: Compare pre/post-catalyst O2 sensor data.
5. Check fuel system:
   • Measure pressure with a pressure gauge (3–4 bar for gasoline, 200–300 bar for diesel).
   • Replace fuel filter if old or clogged.
6. Inspect wiring:
   • Look for broken wires, burnt or corroded connectors.

---

Common Solutions

Problem	Solution	Estimated Cost (€)
Faulty spark plugs/coils	Replace full set.	100–300
Faulty injector	Clean or replace.	150–500
Faulty O2 sensor	Replace pre-catalyst sensor.	80–200
Weak fuel pump	Install new pump.	200–600
Compression leaks	Engine overhaul (rings, gaskets).	1,000–3,000

---

Best Practices

• ECM update: Check manufacturer technical service bulletins (TSB) for software fixes.
• Use appropriate tools: Oscilloscope for CKP/CMP signals, pressure gauge for fuel pressure.

---

FAQ

Q: Can I drive with a P219F code?
A: No! Cylinder imbalance can damage the engine. Limit driving and consult a professional.

Q: Why does the code return after replacing spark plugs?
A: Check O2 sensors or compression. The issue may lie elsewhere.

Understanding the Mitsubishi P1443 Diagnostic Trouble Code

The P1443 code is a manufacturer-specific diagnostic trouble code (DTC) that pertains exclusively to Mitsubishi vehicles. When this code appears, it indicates a malfunction within the Evaporative Emission Control (EVAP) system, specifically related to the Leak Detection Pump (LDP) circuit. The EVAP system is a critical component of your vehicle’s emission control system, designed to prevent fuel vapors from escaping into the atmosphere. Understanding this code is essential for proper diagnosis and repair, as it directly impacts both vehicle emissions and overall performance.

What is the EVAP System and Its Function?

The Evaporative Emission Control system is a sealed network that captures and stores fuel vapors from the fuel tank, preventing them from being released into the environment. This system includes several key components:

• Fuel tank and cap
• Charcoal canister (vapor storage)
• Purge valve/solenoid
• Vent valve
• Leak Detection Pump (LDP)
• Various hoses and connectors

The system works by routing fuel vapors to the charcoal canister, where they are stored until the engine is running under specific conditions. The engine control module (ECM) then opens the purge valve, allowing these stored vapors to be drawn into the engine and burned during normal combustion.

Role of the Leak Detection Pump in Mitsubishi Vehicles

The Leak Detection Pump is a crucial component that actively tests the integrity of the entire EVAP system. Unlike passive systems, Mitsubishi’s LDP creates pressure or vacuum within the EVAP system to check for leaks. The pump typically consists of an electric motor, diaphragm, and various valves that work together to pressurize the system. The ECM monitors the pump’s operation and can detect when it’s not functioning within specified parameters, leading to the P1443 code being stored in the vehicle’s computer memory.

Technical Definition of Code P1443

According to Mitsubishi’s technical documentation, P1443 is defined as “Leak Detection Pump Switch or Mechanical Fault.” This means the vehicle’s Engine Control Module (ECM) has detected an abnormal condition in the Leak Detection Pump circuit or its mechanical operation. The ECM continuously monitors the LDP’s performance during specific drive cycles and will set this code when it detects that the pump isn’t operating as expected, potentially indicating a leak in the EVAP system that exceeds allowable limits.

Common Symptoms and Causes of P1443 Code

Recognizing the symptoms and understanding the potential causes of the P1443 code is the first step toward effective diagnosis and repair. While this code may not always cause immediate drivability issues, it should not be ignored due to its impact on emissions and potential for more significant problems.

Primary Symptoms of P1443 Code

When the P1443 code is stored in your Mitsubishi’s computer, you may experience one or more of the following symptoms:

• Illuminated Check Engine Light (MIL)
• Failed emissions test
• Fuel odor around the vehicle
• Decreased fuel economy
• Rough engine idle in some cases
• No noticeable symptoms in many instances

It’s important to note that the P1443 code may not always cause obvious drivability issues, which is why many drivers discover it only during routine emissions testing or when the check engine light illuminates.

Electrical Causes of P1443 Code

Electrical issues are common culprits for the P1443 code and require thorough diagnostic testing:

• Faulty Leak Detection Pump motor or internal components
• Damaged wiring harness to the LDP
• Corroded or loose electrical connectors
• Blown fuses related to the EVAP system
• Poor ground connections
• Failed ECM in rare cases

Electrical problems often require circuit testing with a digital multimeter to verify proper voltage, ground, and signal integrity throughout the LDP circuit.

Mechanical and Physical Causes

Beyond electrical issues, several mechanical factors can trigger the P1443 code:

• Failed Leak Detection Pump diaphragm
• Clogged or restricted EVAP system lines
• Damaged vacuum hoses
• Faulty gas cap (incorrect seal or damaged)
• Cracked charcoal canister
• Obstructed vent valve or lines

Mechanical failures often require physical inspection of components and smoke testing to identify leaks or restrictions in the EVAP system.

Professional Diagnostic and Repair Procedures

Proper diagnosis of the P1443 code requires a systematic approach using appropriate tools and following manufacturer-recommended procedures. Attempting repairs without proper diagnosis can lead to unnecessary part replacement and continued issues.

Step-by-Step Diagnostic Process

Follow this professional diagnostic approach for accurate P1443 troubleshooting:

• Begin with a visual inspection of all EVAP system components, hoses, and electrical connections
• Use an OBD2 scanner to confirm the P1443 code and check for any additional codes
• Clear the code and perform a test drive to see if it returns
• Perform electrical tests on the LDP circuit including voltage, ground, and resistance checks
• Conduct a smoke test to identify any leaks in the EVAP system
• Test LDP operation using a bidirectional scanner if available
• Monitor live data parameters related to the EVAP system during operation

Testing the Leak Detection Pump

Specific testing procedures for the Leak Detection Pump include:

• Checking LDP resistance specifications (typically 10-30 ohms)
• Verifying proper voltage supply to the pump (usually 12 volts)
• Testing pump operation by applying direct power
• Inspecting the pump diaphragm for damage or leaks
• Checking for proper vacuum/pressure generation
• Verifying the LDP switch operation

Refer to Mitsubishi-specific service information for exact specifications and testing procedures for your particular model and year.

Repair Solutions and Cost Considerations

Once the root cause is identified, appropriate repairs can be implemented:

• Replacing the Leak Detection Pump (most common solution)
• Repairing or replacing damaged wiring and connectors
• Replacing cracked or damaged vacuum hoses
• Installing a new gas cap if faulty
• Replacing the charcoal canister if damaged
• Clearing obstructions from EVAP lines

Repair costs for P1443 can vary significantly based on the specific cause. Parts alone can range from $20 for a gas cap to $300 or more for a new Leak Detection Pump, with labor costs adding $100-$300 depending on repair complexity and shop rates.

Preventive Maintenance and Final Verification

After completing repairs, proper verification and maintenance are crucial:

• Always clear codes after repairs and perform a complete drive cycle
• Verify repair success by monitoring for code recurrence
• Ensure the EVAP system passes functional tests
• Regularly inspect EVAP system components during routine maintenance
• Always use the correct fuel cap and ensure proper installation
• Address any check engine lights promptly to prevent additional issues

Proper diagnosis and repair of the P1443 code will restore your Mitsubishi’s emission system functionality, ensure compliance with environmental regulations, and maintain optimal vehicle performance.

P2000 Possible Causes

• Faulty sensor or solenoid
• Sensor or solenoid wiring harness is open or short-circuited
• Poor electrical connection in sensor or solenoid circuit
• Powertrain Control Module (PCM) / Engine Control Module (ECM) software update
• Faulty Powertrain Control Module (PCM) / Engine Control Module (ECM)
• Damaged catalytic converter
• Catalytic converter malfunction

What Does It Mean?

How to Fix Code P2000

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2000 Possible Symptoms

Engine light on (or service engine soon warning light)

P2000 Meaning

The Powertrain Control Module (PCM) monitors the oxygen sensor. The PCM sets the OBDII code when the oxygen sensor does not meet factory specifications.

P2001 Possible Causes

• Faulty sensor or solenoid
• Sensor or solenoid harness is open or shorted
• Poor electrical connection in sensor or solenoid circuit
• Powertrain Control Module (PCM) / Engine Control Module (ECM) software update
• Faulty Powertrain Control Module (PCM) / Engine Control Module (ECM)
• Damaged catalytic converter
• Improper catalytic converter operation

What Does It Mean?

How to Fix Code P2001

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2001 Possible Symptoms

Engine light on (or service engine soon warning light)

P2001 Meaning

NOx Trap Efficiency Below Threshold Bank 2 is the generic description for P2001 code, but the manufacturer may have a different description. Currently we have no further information about the OBDII P2001 code

P2002 Possible Causes

• Faulty, damaged, or clogged diesel particulate filter (DPF)
• Dirty air filter element

What Does It Mean?

How to Fix Code P2002

Check the “possible causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2002 Technical Notes

To resolve this issue, you will need to change the diesel particulate filter and reset the code with an OBD scanner.

What Does It Mean?

P2002 Possible Symptoms

Engine light on (or service engine soon warning light)

P2002 Meaning

The diesel particulate filter (DPF) is monitored for conditions where it may become overloaded. The monitor compares the calculated DPF restriction to two thresholds. Exceeding the first threshold for a sufficient period of time will trigger a key light. Exceeding the second threshold for a sufficient period of time will trigger both a key light and MIL, and engine power will be limited while EGR is disabled.