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

WARNING: This page is about a different car, the 1996 Eagle Vision, 1996 Dodge Intrepid, 1996 Chrysler New Yorker, 1996 Chrysler LHS, and 1996 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
  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, perform TEST SC-VER .
  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 SC-VER .
  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 SC-VER . 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 SC-VER .
  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 SC-VER .
  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 SC-VER .
  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 SC-VER . If resistance is 5 ohms or more, repair open Black/Yellow wire. Perform TEST SC-VER .
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