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No Response From Transmission Control Module (TCM)

  1. Ensure ignition is off. Disconnect TCM connector. Turn ignition on. Using voltmeter, measure voltage between ground and terminal No. 26 (Dark Blue/White wire) on TCM harness connector. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair open Dark Blue/White wire.
  2. Connect jumper wire between ground and terminal No. 6 (White/Black wire) on TCM harness connector. Using scan tool, select BODY, BODY COMPUTER, then SYSTEM TEST. Perform CCD BUS test. If scan tool displays BUS SHORTED TO GROUND, go to next step. If scan tool displays BUS SHORTED TO GROUND, repair open White/Black wire.
  3. Connect jumper wire between ground and terminal No. 7 (Violet/Brown wire). Using scan tool, perform BUS TEST. If scan tool displays BUS SHORTED TO GROUND, replace TCM. If scan tool displays BUS SHORTED TO GROUND, repair open Violet/Brown wire.
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