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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 I: No Controller Area Network (CAN) Communication
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Test I: No Controller Area Network (CAN) Communication

PINPOINT TEST I: NO CONTROLLER AREA NETWORK (CAN) COMMUNICATION


Test I1-I2:






Test I3-I4:






Test I4-I6:






Test I6-I9:






Test I10-I11:






Normal Operation
The anti-lock brake system (ABS) module, the instrument cluster and the powertrain control module (PCM) communicate with the diagnostic tool through 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. If a module is lost due to internal concerns, communications can continue to all other modules. Check circuits 1827 (WH/LG) and 1828 (PK/LG) between the ABS module C135, the instrument cluster C220a, 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 circuits 1827 (WH/LG) and 1828 (PK/LG), damage to the DLC C251, damage to the PCM C175b, the ABS module C135, the instrument cluster C220a, a problem in the in-line connectors or an internal problem with the PCM, the ABS module, or the instrument cluster. If, after individual checks of each circuit leading to a module show resistance values less than 5 ohms and no in-line connector issues present, the data link diagnostics test must be ran with the module in question disconnected. If the data links diagnostics test passes with the module in question disconnected, it is the source of the concern and should be removed and a new module installed.

Possible Causes
- CAN circuit 1827 (WH/LG) short to voltage, short to ground, or open
- CAN circuit 1828 (PK/LG) short to voltage, short to ground, or open
- in-line connector
- DLC C251
- ABS module C135
- ABS module
- instrument cluster C220a
- instrument cluster
- PCM C175b
- PCM
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