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

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 2.5L 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 a voltmeter, 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 appropriate CRUISE CONTROL SYSTEMS article.
  2. Using an ohmmeter, 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. Turn ignition off. Reconnect SC servo connector. Disconnect Powertrain Control Module (PCM) connectors. Turn ignition on. Using a voltmeter, check voltage on PCM connector terminal No. 78 (Light Green/White wire). Record voltage. Using a voltmeter, 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. Turn ignition off. Disconnect SC servo 4-pin connector. Using an ohmmeter, 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 an ohmmeter, 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 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 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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