P1128 HONDA ACCORD – Manifold Absolute Pressure Sensor Signal Lower Than Expected

P1128 HONDA ACCORD Possible Causes

  • Mechanical condition of the engine
  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Manifold Absolute Pressure (MAP) sensor harness is open or shorted
  • Poor electrical connection in the Manifold Absolute Pressure (MAP) sensor circuit

How to Fix P1128 HONDA ACCORD Code?

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

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P1128 HONDA ACCORD Meaning

The Manifold Absolute Pressure (MAP) sensor detects the absolute pressure in the intake manifold (vacuum) and converts it into electrical signals. The MAP sensor outputs a low signal voltage at high vacuum (idle) and a high signal voltage at low vacuum (wide open throttle).
The Engine Control Module (ECM) compares a predetermined MAP value for a given throttle position and manifold absolute pressure to the MAP sensor’s output voltage value.
If the MAP sensor delivers a voltage lower than expected, the ECM detects a malfunction and stores a DTC.

P1128 ACURA – Manifold Absolute Pressure Sensor Signal Lower Than Expected

P1128 ACURA Possible Causes

  • Engine mechanical condition
  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Manifold Absolute Pressure (MAP) sensor harness is open or shorted
  • Poor electrical connection in the Manifold Absolute Pressure (MAP) sensor circuit

How to Fix ACURA Code P1128?

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

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1128 ACURA Meaning

The Manifold Absolute Pressure (MAP) sensor detects the intake manifold absolute pressure (vacuum) and converts it into electrical signals. The MAP sensor outputs a low signal voltage at high vacuum (idle) and a high signal voltage at low vacuum (wide open throttle).
The Engine Control Module (ECM) compares a predetermined MAP value at a given throttle position and intake manifold absolute pressure to the MAP sensor output voltage value.
If the MAP sensor delivers a voltage lower than expected, the ECM detects a malfunction and stores a DTC.

P1128 AUDI – Long Term Fuel Trim System B1 Too Lean

P1128 AUDI Possible Causes

  • Faulty mass air flow (MAF) sensor
  • Low fuel pressure
  • Engine vacuum leak
  • Faulty Bank 1 HO2S

How to Fix P1128 AUDI Code?

Start by checking 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.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1128 AUDI Meaning

Fuel Trim System Too Lean Long Term Bank 1 is the generic description for Audi P1128 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Audi P1128 OBDII code.

P1128 CHRYSLER – Closed Loop Not Achieved Bank 1

P1128 CHRYSLER Possible Causes

  • Low battery charge
  • Faulty totally integrated power module
  • Fuel supply system
  • Manifold absolute pressure (MAP) sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system
  • Faulty powertrain control module (PCM)

How to Fix P1128 CHRYSLER Code?

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

Technical Notes

Start by checking the battery charge and terminals and the alternator charge. If the battery and alternator are in good condition, the totally integrated power module may be damaged.

Possible Symptoms

  • Engine light on (or engine service warning light soon)
  • Engine hesitation
  • Engine stalling
  • Engine misfire

P1128 CHRYSLER Meaning

The powertrain control module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration, when conditions would otherwise have closed loop operation.

P1128 DODGE – Closed Loop Fueling Not Achieved Bank 1

P1128 DODGE Possible Causes

  • Fuel delivery system
  • Manifold Absolute Pressure (MAP) sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system
  • Faulty Powertrain Control Module (PCM)

How to Fix P1128 DODGE Code?

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

What Does It Mean?

Start by checking the battery load and terminals and the alternator charge. If the battery and alternator are in good condition, the totally integrated power module may be damaged.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)
  • Engine hesitation
  • Engine stalling
  • Engine misfire

P1128 DODGE Meaning

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration, when conditions would otherwise have closed loop operation.

P1128 FORD – Front O2 Sensor Connectors Swapped

P1128 FORD Possible Causes

  • Crossed HO2S wiring harness connectors
  • Powertrain Control Module (PCM) wiring harness connector
 

How to Fix P1128 FORD Code?

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

 
 

Possible Symptoms

  • Check Engine Light on (or soon-to-be-serviced engine warning light)
 

P1128 FORD Meaning

The Diagnostic Trouble Code (DTC) will set whenever the Powertrain Control Module (PCM) detects the upstream oxygen sensor is swapped from Bank to Bank. The Heated Exhaust Gas Oxygen (HEGO) sensor monitor checks and determines if the HO2S signal response for fuel trim change matches the correct engine bank. The code sets when the HO2S being tested is not indicated.

P1128 HONDA – Manifold Absolute Pressure Sensor Signal Lower Than Expected

P1128 HONDA Possible Causes

  • Mechanical condition of the engine
  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Manifold Absolute Pressure (MAP) sensor harness is open or short-circuited
  • Poor electrical connection in the Manifold Absolute Pressure (MAP) sensor circuit

How to Fix P1128 HONDA Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine warning light soon to come on)

P1128 HONDA Meaning

The Manifold Absolute Pressure (MAP) sensor detects the absolute pressure of the manifold (vacuum) and converts it into electrical signals. The MAP sensor outputs a low signal voltage at high vacuum (idle) and a high signal voltage at low vacuum (throttle wide open).
The Engine Control Module (ECM) compares a predetermined MAP value for a given throttle position and manifold absolute pressure to the output voltage value of the MAP sensor.
If the MAP sensor delivers a voltage lower than expected, the ECM detects a malfunction and stores a DTC.

P1128 HYUNDAI – Lean Part Load Fuel Circuit

P1128 HYUNDAI Possible Causes

  • Low fuel pressure – Clogged fuel filter
  • Faulty fuel pump
  • Engine mechanical condition
  • Large vacuum leak

How to Fix P1128 HYUNDAI Code?

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

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1128 HYUNDAI Meaning

The lean partial load fuel system is the generic description for the Hyundai P1128 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have any other information about the Hyundai P1128 OBDII code.

P1128 INFINITI – Throttle Actuator Control Motor Short Circuit

P1128 INFINITI Possible Causes

  • Faulty throttle control motor
  • Throttle control motor harness is open or shorted
  • Poor electrical connection in throttle control motor circuit

How to Fix P1128 INFINITI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The Engine Control Module (ECM) detects short circuits between the ECM and the throttle control motor.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1128 INFINITI Meaning

The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle correctly in response to driving conditions.

P1128 ISUZU – MAP Sensor Voltage Lower Than Expected

P1128 ISUZU Possible Causes

  • Engine mechanical condition
  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Manifold Absolute Pressure (MAP) sensor harness is open or shorted
  • Poor electrical connection in the Manifold Absolute Pressure (MAP) sensor circuit

How to Fix ISUZU Code P1128?

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

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1128 ISUZU Meaning

The Manifold Absolute Pressure (MAP) sensor detects the intake manifold absolute pressure (vacuum) and converts it into electrical signals. The MAP sensor outputs a low signal voltage at high vacuum (idle) and a high signal voltage at low vacuum (wide open throttle).
The Engine Control Module (ECM) compares a predetermined MAP value for a given throttle position and intake manifold absolute pressure to the MAP sensor output voltage value.
If the MAP sensor delivers a voltage lower than expected, the ECM detects a malfunction and stores a DTC.