When it comes to diagnostics and repairs of vehicles, the Ford P0351 code can be one of the most difficult codes to decipher. This code is often associated with an ignition coil A primary control circuit/open and is set when the powertrain control module (PCM) does not receive a valid ignition diagnostic monitor (IDM) pulse signal from the ignition module PCM. While this code is relatively common, it can still be a challenge to diagnose and repair. In many cases, the cause of the code can be attributed to an open or shorted VPWR circuit, an open or shorted COP1 circuit, an open or shorted CDA circuit, a damaged COP or coil pack, or a variety of other issues. To diagnose and repair this code, it is important to understand the underlying causes and potential solutions. The following table outlines the causes and solutions for the Ford P0351 code.
Causes and Solutions for the Ford P0351 Code
| Cause | Solution |
|---|---|
| VPWR circuit open | Test the VPWR voltage at the ignition coil harness connector using a 12 volt non-powered test lamp. |
| VPWR circuit short to ground | Check the VPWR circuit for continuity. |
| COP1 circuit open (COP) | Check the COP1 circuit for continuity. |
| CDA circuit open (coil pack) | Check the CDA circuit for continuity. |
Testing the VPWR Circuit
The first step in diagnosing and repairing the Ford P0351 code is to test the VPWR circuit. This can be done by using a 12 volt non-powered test lamp to check the voltage at the ignition coil harness connector. If the voltage is found to be low or non-existent, then the VPWR circuit is likely open and needs to be repaired.
Checking for a Short to Ground
The next step in diagnosing and repairing the Ford P0351 code is to check for a short to ground. This can be done by using a multimeter to check the VPWR circuit for continuity. If a short to ground is found, then the circuit needs to be repaired.
Testing the COP1 Circuit
The third step in diagnosing and repairing the Ford P0351 code is to test the COP1 circuit. This can be done by using a multimeter to check the COP1 circuit for continuity. If an open or shorted circuit is found, then the circuit needs to be repaired.
Testing the CDA Circuit
The last step in diagnosing and repairing the Ford P0351 code is to test the CDA circuit. This can be done by using a multimeter to check the CDA circuit for continuity. If an open or shorted circuit is found, then the circuit needs to be repaired.
Conclusion
The Ford P0351 code can be one of the most difficult codes to diagnose and repair. However, with a thorough understanding of the underlying causes and potential solutions, it can be addressed and fixed. By testing the VPWR, COP1, and CDA circuits, the cause of the code can be identified and repaired. With patience and a good understanding of the code, the Ford P0351 code can be successfully addressed and repaired.
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