Test K

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

Test K1:

Test K1-K3:

Test K3-K5:

Test K5-K7:

Test K7-K9:

Test K9-K11:

Test K11-K14:

Test K15-K18:

Normal Operation
The powertrain control module (PCM), anti-lock brake system (ABS) module, electronic automatic temperature control (EATC) module, tire pressure monitoring system module, and the instrument cluster communicate with the diagnostic tool through the CAN circuits 3125 (RD/YE) and 3126 (TN/YE). 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 with degraded performance. If a module is lost due to internal concerns, communications can continue to all other modules. Check circuits 3125 (RD/YE) and 3126 (TN/YE) between the PCM C175b, tire pressure monitoring system module C3183, ABS module C155, EATC module C228b, instrument cluster C220b, and the 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 3125 (RD/YE) and 3126 (TN/YE), damage to the data link connector (DLC) C251, damage to one of the network modules, or, a problem in the in-line connectors or an internal problem with one of the networked modules. 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 run 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
- circuits 3125 (RD/YE) and 3126 (TN/YE) shorted to ground or open
- DLC C251
- ABS module
- PCM
- EATC module
- instrument cluster
- tire pressure monitoring system module (if equipped)