P0AF7 - OBD Trouble Code

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Is your vehicle engine performance decreasing and you notice an increase in the fuel consumption and exhaust emissions? Do you notice the Malfunction Indicator Light illuminated on the dashboard? If there are faults in the power module of the car, then P0AF7 fault code is definitely going to trigger up.

If your vehicle has stored a code P0AF7, it means that the powertrain control module (PCM) has detected improper voltage that is outside the normal expected value range within the control circuit with internal temperature higher than normal.

What causes this problem with 14 Volt Power Module Internal Temperature Too High?

• 14-volt power module faulty
• Power module wiring and harness problem
• Poor electrical connections
• PCM programming error

1. Electronic Control Unit - ECU monitors the temperature differences in the boost converter with the help of the temperature sensors to prevent the converter from overheating and malfunctioning. Thus, replace faulty ECU immediately.
2. Engine Control Module - ECM failures and faults can be very difficult to find and resolve as these are very rare and might require a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace it now!
3. Powertrain Control Module - Faulty PCM can disrupt the normal functioning of the vehicle by affecting the transmission system and the fuel delivery system. This will cause the system to store wrong OBD error and thus can lead to misdiagnosis.
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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code PAF7 here:

Common Symptoms

• Illumination in the service engine soon light
• Non-functioning of engine due to high power module system temperature
• Issues in operating the vehicle

We have listed out some ways which would help you to correct the occurrence of OBD Code P0AF7. They are mentioned here as follows:

• Power module replacement
• Faulty wiring and connector replacement
• PCM replacement and reprogramming

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0AF7 code to be stored:

• A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle specific diagnostic information will be required to diagnose a code P0AF7. Locating a technical service bulletin (TSB) that matches the vehicle year, make, and model; as well as the engine size, code/s stored, and symptoms exhibited, could yield helpful diagnostic information.
• Begin my diagnosis with a visual inspection of the module circuit wiring harnesses and connectors. Burnt or damaged wiring and or connectors should be repaired or replaced before proceeding.
• Continue by plugging the scanner into the vehicle diagnostic connector and retrieving all stored codes and pertinent freeze frame data. Consider writing this information down before clearing the codes.
• Test drive the vehicle until the PCM either enters readiness mode or the code is reset. If the PCM enters readiness mode at this time, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions which contributed to the code being stored may need to worsen before an accurate diagnosis can be made.
• If the code is immediately reset, completing the next step of the diagnosis will require that you search your vehicle information source to obtain diagnostic flow charts, connector pin-out charts, connector face views, as well as component testing procedures and specifications.
• Use the DVOM to test (voltage drop) on all power control system grounds. Continue by testing the power supply to the power control system. Test fuses with the circuit loaded to avoid misdiagnosis.
• If input voltage is present on the relay but output voltage is not detected, suspect that the relay is bad. If the module voltage output circuit is within parameters, use the DVOM to test the temperature output. If any of these components fails to meet manufacturer’s specifications, suspect that it has failed.

Common Mistakes When Diagnosing the P0AF7 Code

• Quirks in the powertrain control module
• Wiring related issues