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No Response From Transmission Control Module

  1. Ensure ignition is off. Disconnect Transmission Control Module (TCM) connector. See Figure . Turn ignition on. Using a DVOM, measure voltage between ground and TCM connector terminal No. 26 (Dark Blue/White wire). See Figure . If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Dark Blue/White wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  2. Connect a jumper wire between ground and TCM connector terminal No. 7 (Violet/Brown wire). 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 does not display BUS SHORTED TO GROUND, repair open in Violet/Brown wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  3. Connect a jumper wire between ground and TCM connector terminal No. 6 (White/Black wire). Using scan tool, perform BUS TEST. If scan tool displays BUS SHORTED TO GROUND, replace TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS SHORTED TO GROUND, repair open in White/Black wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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