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Test TC-82A - Speed Control Power Relay Or 12-Volt Driver Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
NOTE: DO NOT depress brake pedal during following steps.
  1. Disconnect S/C servo 4-pin connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A. If connector and terminals are okay, go to next step.
  2. Turn ignition on, engine off. Using scan tool, actuate S/C relay. Using scan tool in voltmeter mode, check voltage on S/C servo 4-pin connector, switched S/C power supply circuit. If voltage is more than 10 volts, go to step 7). If voltage is 10 volts or less, go to next step.
  3. Turn ignition off. Using scan tool in ohmmeter mode, check resistance between ground and S/C servo 4-pin connector, switched S/C power supply circuit. If resistance is less than 5 ohms, repair short to ground in switched S/C power supply circuit and perform TEST VER-4A. If resistance is 5 ohms or more, go to next step.
  4. Disconnect brakelight switch connector. Turn ignition on, key off. Using scan tool, actuate S/C solenoid. Using scan tool in voltmeter mode, check voltage on brakelight switch connector, S/C on/off switch sense circuit (Yellow/Red wire). If voltage is 10 volts or less, perform TEST TC-82B. If voltage is more than 10 volts, go to next step.
  5. 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-4A. If connectors and terminals are okay, go to next step.
  6. Using scan tool in ohmmeter mode, check resistance of S/C on/off switch sense circuit (Yellow/Red wire) between PCM Gray connector and brakelight switch connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-4A. If resistance is 5 ohms or more, repair open S/C on/off switch sense circuit and perform TEST VER-4A.
  7. Turn ignition off. Using an external ohmmeter, check resistance between ground and S/C servo 4-pin connector, ground circuit (Black wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  8. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A. If connectors and terminals are okay, go to next step.
  9. Using an external ohmmeter, check resistance of S/C vacuum solenoid control circuit (Tan/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  10. Check resistance of S/C vent solenoid control circuit (Light Green/Red wire) between PCM Gray connector and S/C servo 4-pin connector. If resistance is 5 ohms or more, repair open S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  11. Check resistance between ground and S/C servo 4-pin connector,S/C vacuum solenoid control circuit (Tan/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vacuum solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, go to next step.
  12. Check resistance between ground and S/C servo 4-pin connector,S/C vent solenoid control circuit (Light Green/Red wire). If resistance is 5 ohms or more, repair short to ground in S/C vent solenoid control circuit and perform TEST VER-4A. If resistance is less than 5 ohms, replace S/C servo and perform TEST VER-4A.
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