Pinpoint Test D: The Powertrain Control Module (Pcm) Does Not Respond To The Diagnostic Tool
WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- D1 CHECK THE PCM C175B
- Key in OFF position.
- Disconnect: PCM C175b.
- Inspect the PCM C175b for damage.
- Is the PCM C175b OK?
- Yes : GO to D2.
- No : REPAIR the PCM C175b. CARRY OUT the data link diagnostics test.
- D2 CHECK CIRCUITS 1814 (WH/LB) AND 1815 (PK/LB) BETWEEN THE PCM C175B AND THE DLC C251 FOR AN OPEN
- Measure the resistance between the PCM C175b pin 2, circuit 1814 (WH/LB), harness side and the DLC C251 pin 6, circuit 1814 (WH/LB), harness side.
- Measure the resistance between the PCM C175b pin 3, circuit 1815 (PK/LB), harness side and the DLC C251 pin 14, circuit 1815 (PK/LB), harness side.
- Are the resistances less than 5 ohms?
- Yes : GO to D3.
- No : REPAIR the circuit in question. CARRY OUT the data link diagnostics test.
- D3 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the data link diagnostics test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.