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

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see 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: SPEED CONTROL VERIFICATION . If connector and terminals are okay, go to next step.
  2. Turn ignition on, engine off. Using scan tool, actuate S/C relay. On AB body, go to step 3)  . On all other bodies, use scan tool in voltmeter mode to check voltage on S/C servo 4-pin connector, brake switch output circuit (Dark Blue/Light Green wire on ZJ body; Dark Blue/Red wire on all other bodies). If voltage is more than 10 volts on TJ, XJ and ZJ bodies, perform TEST TC-82C. On all other bodies, go to step 10)  . If voltage is 10 volts or less, go to step 4)  .
  3. Connect a test light between ground and S/C servo 4-pin connector, S/C brake switch output circuit (Dark Blue/Red wire). If test light illuminates brightly, go to step 10)  . If test light does not illuminate brightly, go to next step.
  4. Disconnect battery. Turn ignition off. Using scan tool in ohmmeter mode, check resistance between ground and S/C servo 4-pin connector, brake switch output circuit (Dark Blue/Light Green wire on ZJ body; Dark Blue/Red wire on all other bodies). If resistance is less than 5 ohms, repair short to ground in brake switch output circuit and perform TEST VER-4A: SPEED CONTROL VERIFICATION . If resistance is 5 ohms or more, go to next step.
  5. Reconnect battery. Disconnect brakelight switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A: SPEED CONTROL VERIFICATION . If connector and terminals are okay, go to next step.
  6. On AB body, go to next step. On all other bodies, turn ignition on, engine off. Using scan tool, actuate S/C solenoid. Using scan tool in voltmeter mode, check voltage on brakelight switch connector, S/C power supply circuit (Yellow/Red wire). If voltage is 10 volts or less, perform TEST TC-82B: SPEED CONTROL SOLENOID CIRCUITS OR SPEED CONTROL POWER RELAY CIRCUITS . If voltage is more than 10 volts, go to step 8)  .
  7. Connect a test light between ground and brakelight switch connector, S/C power supply circuit (Yellow/Red wire). If test light illuminates brightly, perform TEST TC-82B: SPEED CONTROL SOLENOID CIRCUITS OR SPEED CONTROL POWER RELAY CIRCUITS . If test light does not illuminate brightly, go to next step.
  8. 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: SPEED CONTROL VERIFICATION . If connectors and terminals are okay, go to next step.
  9. Using scan tool in ohmmeter mode, check resistance of S/C power supply 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: SPEED CONTROL VERIFICATION . If resistance is 5 ohms or more, repair open S/C power supply circuit and perform TEST VER-4A: SPEED CONTROL VERIFICATION .
  10. 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: SPEED CONTROL VERIFICATION . If resistance is less than 5 ohms, go to next step.
  11. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A: SPEED CONTROL VERIFICATION . If connectors and terminals are okay, go to next step.
  12. 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: SPEED CONTROL VERIFICATION . If resistance is less than 5 ohms, go to next step.
  13. 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: SPEED CONTROL VERIFICATION . If resistance is less than 5 ohms, go to next step.
  14. Check resistance between ground and S/C servo 4-pin connector, S/C vacuum solenoid control circuit (Tan/Red wire). If resistance is less than 5 ohms, repair short to ground in S/C vacuum solenoid control circuit and perform TEST VER-4A: SPEED CONTROL VERIFICATION . If resistance is 5 ohms or more, go to next step.
  15. Check resistance between ground and S/C servo 4-pin connector, S/C vent solenoid control circuit (Light Green/Red wire). If resistance is less than 5 ohms, repair short to ground in S/C vent solenoid control circuit and perform TEST VER-4A: SPEED CONTROL VERIFICATION . If resistance is 5 ohms or more, replace S/C servo and perform TEST VER-4A: SPEED CONTROL VERIFICATION .
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