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Diagnosis & Repair

  1. Ensure ignition is off. Access ECM. See ELECTRONIC CONTROL MODULE  under REMOVAL & INSTALLATION. Disconnect ECM connector E4, E12 or E17 (GS, LS or SC model). Using ohmmeter, measure resistance between ground and terminal No. 6 (S4) on ECM connector. See Figure, Figure, Figure or Figure . If resistance is 11-15 ohms, replace ECM and retest. If resistance is not within specification, go to next step.
  2. Disconnect transmission solenoid harness connector. See Figure. Check continuity between terminal S4 on transmission harness connector and corresponding terminal of ECM. See Figure. If continuity exists for all circuits, go to next step. If continuity does not exist for any circuit, inspect and repair circuit(s) as necessary.
  3. Remove and inspect operation of solenoids. See NO. 1, NO. 2, NO. 3 & NO. 4 SOLENOIDS  under COMPONENT TESTS. If solenoid(s) are okay, inspect internal solenoid sub-harness. Replace internal sub-harness as necessary.
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