Pinpoint Test I: The Powertrain Control Module (Pcm) Does Not Respond To The Diagnostic Tool - Controller Area Network (Can)
WARNING: This page is about a different car, the 2005 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
- I1 CHECK THE PCM C175B FOR DAMAGE
- Key in OFF position.
- Disconnect: PCM C175b.
- Inspect the PCM C175b for damage.
- Is the PCM C175b OK?
- Yes : GO to I2.
- No : REPAIR the C175b as necessary. CARRY OUT the diagnostic tool data link test.
- I2 CHECK CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) FOR AN OPEN BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE PCM C175B
- Measure the resistance between the PCM C175b pin 11, circuit 1827 (WH/LG), harness side and the DLC C251 pin 6, circuit 1827 (WH/LG), harness side.
- Measure the resistance between the PCM C175b pin 23, circuit 1828 (PK/LG), harness side and the DLC C251 pin 14, circuit 1828 (PK/LG), harness side.
- Are the resistances less than 5 ohms?
- Yes : GO to I3.
- No : REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.
- I3 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 . CARRY OUT the diagnostic tool data link 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 diagnostic tool data link test.