No Response From TCM

NO RESPONSE FROM TCM





For complete wiring diagram refer to the wiring section.

POSSIBLE CAUSES
- (A919) fused B(+) circuit open or shorted
- (Z908) (Z977) ground circuit open
- (F202) (F924) fused ignition SW output circuit open or shorted
- (D65) CAN C bus (+) circuit open
- (D64) CAN C bus (-) circuit open
- Powertrain control module

DIAGNOSTIC TEST

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE:
- Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts. With the scan tool, select ECU view.
- A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
- Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding.

Q: Does the scan tool display a red X next to the module?

YES: Go To 2
NO: The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent , pushed out, and corroded terminals.

2. ATTEMPT TO COMMUNICATE WITH THE PCM
With the scan tool in ECU view, observe the status of the PCM.

Q: Does the scan tool display a red X next to the PCM?

YES: Refer to the No Response From PCM test procedure. Refer to the table of contents.
NO: Go To 3




3. (Z908) (Z977) GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM C4 harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Using a 12-volt test light connected to 12-volts, check each (Z908) and (Z977) ground circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Replace and program the Powertrain Control Module in accordance with the service information.
NO: Repair the ground circuit for an open. Perform the appropriate TRANSMISSION VERIFICATION TEST.