*NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE) - NGC





For a complete wiring diagram Refer to Section 8W.



Possible Causes
  
(A209) B(+) CIRCUIT OPEN OR SHORTED
  
(Z903) GROUND CIRCUIT OPEN
  
(F1) 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


NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.



NOTE: 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.



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



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 in this section.


No
  • Go To 3

3.(Z903) GROUND CIRCUIT OPEN





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.




Does the test light illuminate brightly?

Yes
  • Replace and program the Powertrain Control Module in accordance with the service information.
  • Perform the appropriate VERIFICATION TEST.


No
  • Repair the (Z903) ground circuit for an open.
  • Perform the appropriate VERIFICATION TEST.