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Home >> Lincoln >> 2005 >> LS V6-3.0L DOHC VIN S >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Tests >> Test H: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool
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Test H: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool

PINPOINT TEST H: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL


H1:






H2-H3:






Normal Operation
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 CAN communications network circuits become 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 C175b and the data link connector (DLC) C251. The 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 C175b.

Possible Causes
- 4-EC7 (GY/RD) or 5-EC7 (BU/RD) shorted to ground or open
- PCM C175b
- DLC C251
- PCM
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