P0111 code definition

Intake Air Temperature (IAT) sensor circuit range or performance problem

P0111代码意味着什么

P0111 is the OBD-II generic code that indicates the engine control module (ECM) has recorded the IAT sensor input go out of the sensors range or the sensor performance was not as the ECM expected.

是什么原因导致P0111代码？

• The IAT sensor range input to the ECM went to -40°F or 240°F indicating a short or open circuit.

• The IAT sensor input to the ECM is erratic and not giving a steady stable reading.

P0111代码的症状是什么？

• ECM将打开检查引擎灯并进入故障安全模式。
• 发动机可能有艰难的起步条件。
• The engine may also have a reduction in fuel mileage.
• 排气可能会吹黑烟。

Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.

How does a mechanic diagnose the P0111 code?

• The mechanic will need to do a visual inspection to determine any electrical connector, wiring, or sensor issues.

• The technician will scan and document the codes received and view the freeze frame data to see when the code was set.

• The codes should then be reset to clear the OBD-II fault codes and retest the vehicle to see if the code comes back.

• 机械师将在扫描仪上观察传感器的实时数据，以便温度输出在规格之内。

If no problems are noted, then the next step for the technician to do is to perform a manufacturer's specific pinpoint tests for the code and repair as needed.

诊断P0111代码时常见错误

• Not doing a visual inspection first

• 不遵循制造商的精确测试程序，并逐步进行跳过步骤

• 在测试之前替换IAT传感器表明问题

• Before installation of the new IAT sensor, not connecting it and viewing the ECM data to see if the temperature output from the sensor is as expected

P0111代码有多严重？

• The P0111 code will cause the engine ECM to go into a failsafe mode.

• The failsafe mode may cause excessive fuel consumption, carbon fouling of engine components, and various drive complaints, depending on the manufacturer failsafe mode strategy.

• Driving the vehicle for an extended time with the vehicle in failsafe mode may require additional repairs to remove carbon or repair possible ignition problems.

What repairs can fix the P0111 code?

• Repairing or replacing the IAT connector
• Repairing or replacing the wiring as necessary
• 将传感器重新定位回空气滤清器外壳或进气管
• 用新传感器代替IAT

Additional comments for consideration regarding the P0111 code

• P0111代码通常与P0112，P0113和P0114代码相关联。

• Most failures for code P0111 are a harness shorting or a connector corrosion issue.

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