Test N: No High Speed Controller Area Network (CAN) Communication

PINPOINT TEST N: NO HIGH SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION

N1-N2:

N2-N4:

N5:

N5-N8:

N8-N11:

N11-N13:

N14-N17:

N17-N18:

N19-N20:

N20-N22:

N23-N26:

N27-N28:

Normal Operation
The following modules communicate using the high speed CAN:
- powertrain control module (PCM)
- instrument cluster
- transmission control module (TCM) 6-speed
- TCM FNR5
- anti-lock brake system (ABS) module
- restraint control module (RCM)
- occupant classification sensor

The high speed CAN has an unshielded twisted pair cable, circuits VDB04 (WH/BU) and VDB05 (WH).

For normal operation of the high speed CAN, correct network termination resistance is required. The PCM and instrument cluster share communications network termination responsibilities with the use of a split termination resistor in each module.

Check the high speed CAN circuits between each network module 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 one of the high speed CAN circuits, damage to the DLC C251, damage to one of the module connectors, or a problem in an in-line connector.

Possible Causes
- high speed CAN data plus circuit VDB04 (WH/BU) open, short to ground, or short to voltage
- high speed CAN data minus circuit VDB05 (WH) open, short to ground, or short to voltage
- DLC C251
- PCM C175b
- TCM C2352b (FNR5) or C1533 (6-speed)
- ABS module C135
- RCM C310b
- occupant classification sensor C3159
- instrument cluster C220
- PCM
- TCM (FNR5) or (6-speed)
- ABS module
- RCM
- occupant classification sensor
- instrument cluster