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DTC P1739/26: 3RD Clutch Pressure Switch

  1. Turn ignition on. Measure voltage between 22-pin TCM harness connector "B", terminal No. 16 (Blue/White wire) and 26-pin TCM harness connector "A", terminals No. 13 or 26 (Brown/Black wires). See Figure and Figure . If battery voltage is present, go to next step. If battery voltage is not present, go to step 4)  .
  2. Turn ignition off. Disconnect 3rd clutch pressure switch connector. See Figure . Turn ignition on. Measure voltage between ground and 3rd clutch pressure switch connector. If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in Blue/White wire between 22-pin TCM harness connector "B" and 3rd clutch pressure switch connector.
  3. Measure resistance between ground and 3rd clutch pressure switch connector. If resistance is 10 megohms or more, check for loose TCM or 3rd clutch pressure switch harness connectors. Replace TCM or 3rd clutch pressure switch with a known-good unit if necessary. If resistance is less than 10 megohms, replace 3rd clutch pressure switch.
  4. Disconnect 22-pin TCM harness connector "B" and 3rd clutch pressure switch harness connector. Check for continuity between ground and 22-pin TCM harness connector "B", terminal No. 15 (Blue/White wire). If continuity is not present, replace TCM. If continuity is present, repair short to ground in Blue/White wire.
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