LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lincoln >> 2003 >> Town Car Protection Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 767 (Module Communications Network) >> Diagnosis And Testing >> Communications Network >> Pinpoint Test H: The Powertrain Control Module (PCM) Does Not Respond To The Diagnostic Tool >> Normal Operation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Normal Operation

WARNING: This page is about a different car, the 2003 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

The PCM communicates with the diagnostic tool through the controller area network (CAN) circuits 4-EC7 (GY/RD) and 5-EC7 (BU/RD). If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 4-EC7 (GY/RD) and 5-EC7 (BU/RD) between the PCM C175a and the data link connector (DLC) C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in circuit 4-EC7 (GY/RD) or 5-EC7 (BU/RD), damage to the DLC C251, or damage to the PCM C175a.

scientia non olet · About LEMON Manuals