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Home >> Ford >> 2005 >> F 150 2WD Pickup V6-4.2L VIN 2 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Test B: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool
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Test B: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool

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


Test B1:






Test B2-B3:






Normal Operation
The PCM communicates with the diagnostic tool through controller area network (CAN) circuits 1827 (WH/LG) and 1828 (PK/LG). If one of the CAN circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 1827 (WH/LG) and 1828 (PK/LG) 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 1827 (WH/LG) and 1828 (PK/LG), damage to the DLC C251, damage to the PCM C175b, or a problem with the in-line connector.

Possible Causes
- circuit 1827 (WH/LG) open
- circuit 1828 (PK/LG) open
- in-line connector
- DLC C251
- PCM C175b
- PCM
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