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Test TC-188A - O/D Switch Low Rationality

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.
  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
  2. Using scan tool in ohmmeter mode, check resistance of PCM Gray connector, Overdrive (O/D) off switch sense circuit (Orange/White wire). Press O/D off switch 2 or 3 times. If resistance changes while pressing button, replace PCM and perform TEST VER-2A . If resistance does not change, go to next step.
  3. Disconnect O/D switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
  4. Using scan tool in ohmmeter mode, check resistance of O/D switch connector, O/D switch sense circuit (Orange/White wire). If resistance is less than 5 ohms, repair short to ground in O/D switch sense circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  5. Using an external ohmmeter, check resistance of O/D switch sense circuit between PCM Gray connector and O/D switch connector. If resistance is 5 ohms or more, repair open O/D switch sense circuit and perform TEST VER-2A . If resistance is less than 5 ohms, replace O/D switch and perform TEST VER-2A.
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