什么是P0114故障码？

P0114是动力总成系统中表示进气温度传感器电路间歇性信号的通用OBD-II故障代码。动力总成控制模块检测到该传感器信号出现异常且不规则的波动。

IAT传感器的作用与症状

IAT传感器对空燃比计算和点火正时至关重要。发生故障时可能出现以下症状：

• 发动机性能下降（尤其在冷启动时）
• 加速时犹豫或失火
• 燃油消耗量增加
• 怠速不稳
• 故障指示灯亮起

P0114故障码的可能原因

• IAT传感器连接器松动或腐蚀（最常见原因）
• 线路损坏、短路或断路
• IAT传感器故障
• 集成式空气流量传感器问题
• 空气滤清器堵塞或进气管损坏
• 动力总成控制模块故障（罕见）

诊断步骤

1. 初步检查：

• 查阅制造商技术服务公告
• 目视检查连接器、线路、空气滤清器和进气管

2. 使用诊断工具测试：

• 通过OBD2扫描器读取IAT传感器实时数据
• 对比显示温度与实际环境温度
• 若数值异常或不稳定，需进行进一步测试

3. 传感器电气测试：

• 用数字万用表测量传感器电阻值
• 与制造商标准值对比（通常温度升高时电阻降低）
• 检查连接器基准电压与接地情况

4. 电路检查：

• 若传感器正常，测试传感器与动力总成控制模块间的线路通断及短路情况

维修建议

若IAT传感器数值超出规定范围应予以更换。必要时清洁或固定连接器。维修完成后清除故障码，并通过路试确认问题是否复发。

💡 温馨提示： 若近期更换过空气滤清器，请检查IAT传感器连接器是否松动！

相关故障码

P0110、P0111、P0112、P0113、P0095、P0096、P0097、P0098、P0099

车辆诊断遇到困难？ 为确保诊断准确性与安全性，建议咨询配备专业扫描设备的维修专家。

What is the P0113 Code?

The trouble code P0113 is a generic OBD-II (On-Board Diagnostics) powertrain-related code. It indicates that the Powertrain Control Module (PCM) has detected an abnormally high input voltage in the Intake Air Temperature (IAT) sensor circuit 1. Although it is a generic code, specific diagnostic procedures may vary depending on the vehicle’s manufacturer and model.

How the IAT Sensor Works

The PCM sends a 5-volt reference voltage to the IAT sensor. This sensor is a thermistor, meaning its electrical resistance changes with the temperature of the intake air.

• Cold Air: High resistance → High signal voltage
• Warm Air: Low resistance → Low signal voltage

The P0113 code is triggered when the PCM detects a signal voltage exceeding 4.5-5 volts (indicating an unrealistically low temperature, such as below -30°C).

Symptoms of the P0113 Code

This trouble code often presents few symptoms noticeable to the driver:

• Illumination of the Malfunction Indicator Lamp (MIL) or “Check Engine” light
• Slight decrease in performance or fuel economy
• In some cases, the vehicle may enter Limp Mode (reduced power mode)

Potential Causes of the P0113 Code

The following issues can cause this code:

1. Internal failure of the IAT sensor (most common cause)
2. Poor connection: Loose, corroded, or damaged IAT sensor connector
3. Wiring problems: Short to power in the signal circuit or open in the ground circuit
4. Electrical interference: IAT sensor harness placed too close to high-voltage components (spark plugs, alternator)
5. PCM failure (rare, but possible)

Diagnosis and Repair

Here is a step-by-step diagnostic procedure to identify and resolve the cause of the P0113 code.

1. Verification with a Diagnostic Tool

Connect an OBD-II scan tool and observe the IAT temperature value in real-time.

• If the displayed value is plausible (e.g., 10°C on a cold day), the issue is likely intermittent. Check for loose wiring connections.
• If the displayed value is abnormally low (e.g., -40°C), proceed with the following tests.

2. Testing the Sensor and Wiring

Procedure A: With the ignition OFF, disconnect the IAT sensor connector. Connect a jumper wire between the signal pin and ground pin on the harness side connector. Turn the ignition ON (without starting the engine) and check the IAT reading on the scan tool.

• If the reading becomes very high (e.g., >120°C), the wiring is okay. Replace the IAT sensor.
• If the reading remains low, there is a problem with the wiring or the PCM.

Procedure B: Use a Digital Multimeter (DVOM) to measure the voltage between the signal wire and ground.

• It should read approximately 5 volts. If no voltage is present, check for an open circuit in the PCM’s 5V reference circuit.
• Check the continuity and for shorts in each wire (signal, ground, reference voltage) between the PCM connector and the IAT sensor connector.

3. Cleaning and Replacement

Visually inspect the connector and sensor for corrosion or damage. Clean the terminals if necessary. If the previous tests indicate a faulty sensor, replace it with an OEM quality part.

Related DTC Codes

Other codes related to the IAT sensor circuit: P0110, P0111, P0112, P0114

Summary and Call to Action

The P0113 code is often resolved by replacing the IAT sensor, which is a relatively accessible and low-cost component. However, accurate diagnosis using a scan tool and multimeter is essential to avoid unnecessary part replacement.

Unsure about performing these tasks? For your vehicle’s diagnosis and repair, consult a certified professional mechanic. They possess the expertise and equipment to efficiently resolve the issue and ensure your engine’s proper operation.

代码P0112：定义与说明

故障代码P0112是动力总成相关的通用OBD-II代码。它表示发动机控制模块（PCM）检测到进气温度（IAT）传感器输入的电压异常偏低。虽然这是通用代码，但具体诊断步骤可能因汽车制造商和型号而异。

IAT传感器（进气温度传感器）的作用

IAT传感器负责测量进入发动机的空气温度。这些数据对PCM至关重要，用于调整空燃比和点火正时。由于热空气密度较低，需要调整以维持最佳性能和低排放。该传感器基于热敏电阻原理工作：温度升高时电阻降低。PCM发送5V参考电压，通过解读返回电压来确定温度。

代码P0112的症状

症状可能不明显或更为显著：

• 仪表板发动机警告灯（MIL）亮起
• 燃油消耗量显著增加
• 空燃比过浓（燃油过多）
• 加速时失火、熄火或爆震
• 排放检测不合格（氮氧化物排放量高）
• 可能进入跛行模式（功能降级模式）

故障代码P0112的可能原因

此代码的可能原因包括：

• IAT传感器故障：内部故障、短路或断路
• 线路问题：信号线对地短路，电源线或接地线断路/腐蚀
• 连接器不良：传感器插头针脚氧化/松动/损坏
• 异常高温：进气过热（如：发动机附近进气管损坏）
• PCM故障：较为罕见，但可作为最终排查方向

P0112的诊断与解决方案

请按以下步骤诊断和修复故障：

1. 外观检查：检查传感器、连接器及线束是否损坏/腐蚀/存在异物
2. 读取实时数据：使用OBD2扫描仪查看IAT温度值，冷车时应接近环境温度
3. 断开测试：拔下传感器插头，扫描仪读数应骤降（如显示-40°C），若如此则传感器极可能需更换
4. 通断与短路测试：若断开后读数仍异常偏高，需用万用表检测信号线对地短路情况，并检查电源/接地线导通性
5. 更换部件：确定问题根源后更换故障件（传感器/线缆），清除代码并验证故障是否排除

相关DTC代码

IAT电路相关代码：P0095、P0096、P0097、P0098、P0099、P0110、P0111、P0113、P0114

遇到困难？

电气系统诊断可能较为复杂。若缺乏工具或专业信心，建议咨询专业技师以获取精准诊断和可靠维修。

什么是P0111故障码？

P0111是OBD-II通用动力总成故障码，表示进气温度传感器电路性能异常。该传感器通过监测进气温度来帮助发动机控制模块调整空燃比，对发动机正常运行至关重要。

IAT传感器工作原理

进气温度传感器采用热敏电阻设计，其电阻值会随温度变化而改变。传感器通常包含两条线路：一条接收来自PCM的5伏参考电压，另一条连接接地线。PCM通过监测电路电压降来计算温度值。

• 低温空气：电阻值升高 → 信号电压增强
• 高温空气：电阻值降低 → 信号电压减弱

当PCM检测到电压出现异常波动或超出合理范围时，便会触发P0111故障码。

故障症状

该故障码常表现为间歇性问题，症状可能不明显：

• 发动机故障灯点亮
• 动力输出下降
• 燃油消耗增加
• 偶发性的怠速不稳或发动机喘振

潜在成因

可能引发P0111故障码的因素包括：

• 🔧 传感器本体故障（最常见原因）
• ⚡ 电路问题：信号线开路或对地短路
• 🔌 连接器故障：传感器或PCM端接口氧化/松动/腐蚀
• 🧵 线束损伤：导线磨损或断裂

诊断与解决方案

基础检查

1. 同步故障码检测：优先诊断与IAT系统相关的其他故障码（如P0110/P0112/P0113）

2. 外观检查：仔细检查传感器连接器及线束是否存在物理损伤或腐蚀

专业设备检测

使用OBD-II诊断仪时：

• 在点火开关开启状态下读取传感器实时数据
• 对比冷启动时的进气温度与冷却液温度读数，正常状态下两者应趋于一致
• 调用诊断仪”冻结帧”功能分析故障发生时的数据特征：
  • 若读数异常偏低（如-30°F），需排查间歇性高电阻问题（线路开路或传感器失效）
  • 若读数异常偏高（如>250°F），需检查间歇性低电阻状况（线路对地短路）

传感器测试

物理检测步骤：

1. 断开传感器电气连接器
2. 使用万用表电阻档测量端子间阻值
3. 对传感器进行温度刺激测试（如冷藏后适度加热，避免过热损坏）
4. 正常传感器应呈现平滑连续的电阻变化，否则需更换

电路系统检测

若传感器正常，则需检查电路：

• 用电压表验证连接器处5V参考电压与接地是否正常
• 启动状态下晃动线束，观察信号电压是否出现突变

总结与建议

对于新款车型，更换IAT传感器通常能解决P0111故障码。老旧车辆建议重点检查线束系统。

🔧 遇到技术难题？ 若诊断过程复杂，建议寻求专业技师进行精准检测与维修。

相关故障码：P0095，P0096，P0097，P0098，P0099，P0110，P0112，P0113，P0114，P0127

What is the P0110 Code?

P0110 is a generic OBD-II powertrain-related error code. It indicates a malfunction in the Intake Air Temperature (IAT) sensor circuit, sensor 1. This code signifies that the Powertrain Control Module (PCM) has detected an abnormal voltage from the IAT sensor outside the normal operating range.

Role and Operation of the IAT Sensor

The Intake Air Temperature (IAT) sensor is a thermistor. Its electrical resistance changes according to the temperature of the air it measures. It is typically installed in the air intake duct or intake manifold.

The PCM sends a 5-volt reference voltage to the sensor. As the air temperature changes, the sensor’s resistance varies, altering the signal voltage returned to the PCM. The PCM interprets this voltage to calculate the air temperature. Cold air increases resistance and voltage, while warm air decreases resistance and voltage.

Symptoms of the P0110 Code

• Malfunction Indicator Lamp (MIL) illuminated on the dashboard.
• Incorrect air-fuel ratio.
• Reduced engine power.
• Increased fuel consumption.
• Irregular idling.
• In some cases, no noticeable symptoms may appear.

Possible Causes of the P0110 Code

• Faulty IAT Sensor: The sensor itself is not functioning.
• Electrical Circuit Issues: Short to ground or power, open circuit, damaged wiring.
• Connector Problems: Corroded, loose, or damaged terminals/connectors.
• Improper Sensor Installation: Sensor is dislodged and not in the airflow.
• PCM Issues: Internal failure of the control module (rare).

Diagnosis and Solutions for Fixing P0110

Preliminary Checks

1. Visual Inspection: Check if the IAT sensor is properly installed and if the air ducts are loose or have holes.
2. Connector Check: Inspect the sensor’s electrical connector for corrosion, damage, or loose wiring.

Testing with Diagnostic Tools

1. Turn the key to ON (engine off) when the engine is cold.
2. Use a diagnostic tool to compare the values of the IAT sensor and the Coolant Temperature Sensor (CTS). They should be very close (within a few degrees).
3. If the IAT value shows an extreme temperature (e.g., -40°C or +300°C), it confirms an issue.

Electrical Testing of the Sensor

1. Disconnect the IAT sensor connector.
2. Set a multimeter to ohmmeter mode and measure the resistance between the two pins of the sensor.
3. Compare the reading with the manufacturer’s specifications (available in repair manuals). Infinite resistance (open circuit) or zero resistance (short circuit) indicates a faulty sensor that needs replacement.

Advanced Circuit Diagnosis

If the reading is very high (around 300°C):

1. Disconnect the sensor. If the reading changes to a very low value (around -50°C), replace the IAT sensor.
2. If the reading does not change, use a multimeter to check for a short to ground in the signal wire. If continuity to ground is present, repair the wiring.

If the reading is very low (around -50°C):

1. Disconnect the sensor and check for the presence of a 5V reference voltage and a good ground at the vehicle-side connector.
2. If 5V and ground are present, short the two pins of the vehicle-side connector. If the diagnostic tool reading changes to a very high value, replace the sensor.
3. If 5V is not present, check the circuit to the PCM for an open wire.

Related DTC Codes

P0095, P0096, P0097, P0098, P0099, P0111, P0112, P0113, P0114, P0127

Conclusion and Call to Action

The P0110 code is often resolved by replacing the IAT sensor, which is typically an inexpensive part. However, careful verification of the electrical circuit is essential to avoid unnecessary part replacements.

Don’t have a diagnostic tool or unsure about performing these steps? Leave the diagnosis to a professional mechanic. They can quickly identify and resolve the issue, ensuring your vehicle operates correctly.