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Test SC-2A: Checking Speed Control Operation

  1. Turn ignition off. Disconnect speed control switch connector(s). Check connector(s) for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST SC-VER  . If connector(s) is okay, go to next step.
  2. Using external ohmmeter, measure resistance of speed control switch signal circuit between speed control switch connector (Red/Light Green wire) and ground. If resistance is less than 5 ohms, repair short to ground in Yellow/Red or White wire. Perform TEST SC-VER  . If resistance is 5 ohms or more, go to next step.
  3. Measure the resistance of the speed control ground circuit between the speed control switch (Brown/Yellow wire) and ground. If the resistance is 5 ohms or more, repair the open in the ground circuit. Refer to WIRING DIAGRAMS  . Perform TEST SC-VER  . If resistance is less than 5 ohms, go to next step.
  4. Connect a jumper wire between speed control switch connector terminals No. 1 and 2 (switch signal circuit and ground circuit). See Figure . Use scan tool to read speed control switch voltage. If scan tool displays 0.00V, replace speed control switch. Perform TEST SC-VER  . If scan tool does not display 0.00V, go to next step.
  5. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, measure resistance of speed control switch signal circuit between speed control switch connector and PCM Gray connector. See SPEED CONTROL SWITCH SIGNAL CIRCUIT WIRE IDENTIFICATION  . See Figure and Figure . If resistance is less than 5 ohms, replace PCM. Perform TEST SC-VER  . If resistance is more than 5 ohms, go to next step.
    SPEED CONTROL SWITCH SIGNAL CIRCUIT WIRE IDENTIFICATION

    Body Terminal No. Wire Color
    At PCM C32 Red/Light Green
    At Speed Control Switch 2 Red/Light Green
  6. Disconnect clockspring-to-instrument panel harness connector. Connector is located on steering column below clockspring. Measure resistance of speed control switch signal circuit between clockspring harness connector terminal No. 3 and Gray PCM connector terminal C32 using an external ohmmeter. See Figure . See WIRING DIAGRAMS  . If resistance is less than 5 ohms, replace clockspring. Perform TEST SC-VER  . If resistance is more than 5 ohms, repair open in speed control switch signal circuit between clockspring harness connector terminal No. 3 and Gray PCM connector terminal C32. See the following:
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