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Test TC-15C - Speed Control Power Relay & Solenoid Circuits

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see appropriate WIRING DIAGRAMS - NON-TURBO article.
  1. Disconnect Speed Control (SC) servo 4-pin connector. Turn ignition on. Put speed control on/off switch in ON position. DO NOT depress brake pedal during testing. Using scan tool in voltmeter mode, check voltage on SC servo connector Dark Blue/White wire. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, see the CRUISE CONTROL SYSTEMS article in the ACCESSORIES/SAFETY EQUIPMENT section.
  2. Using scan tool in ohmmeter mode, check resistance on SC servo connector Black wire. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Black wire. Perform TEST VER-4A.
  3. Reconnect SC servo connector. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 78 (Light Green/White wire). Record voltage. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 80 (Black/Yellow wire). If voltage on both circuits is more than 9 volts, replace PCM. Perform TEST VER-4A. If voltage on both circuits is 9 volts or less, go to next step.
  4. Disconnect SC servo 4-pin connector. Using scan tool in ohmmeter mode, check resistance of SC servo connector Light Green/White wire. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Light Green/White wire. Perform TEST VER-4A.
  5. Using scan tool in ohmmeter mode, check resistance of SC servo connector Black/Yellow wire. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Black/Yellow wire. Perform TEST VER-4A.
  6. Using an external ohmmeter, check resistance of SC vacuum solenoid control circuit Light Green/White wire between SC servo connector and Powertrain Control Module (PCM) connector terminal No. 78. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Light Green/White wire. Perform TEST VER-4A.
  7. Using an external ohmmeter, check resistance of SC vent solenoid control circuit Black/Yellow wire between SC servo connector and PCM connector terminal No. 80. If resistance is less than 5 ohms, replace SC control servo. Perform TEST VER-4A. If resistance is 5 ohms or more, repair open Black/Yellow wire. Perform TEST VER-4A.
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