Test SC-2A - Checking Speed Control Operation
- 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(are) okay, check resistance of speed control switch signal circuit using an external ohmmeter. Measure resistance between speed control switch connector (White 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 greater, check resistance of speed control ground circuit. Measure between speed control switch (Black wire) and ground. If resistance is 5 ohms or greater, repair open in ground circuit. See WIRING DIAGRAMS . Perform TEST SC-VER. If resistance is less than 5 ohms, go to next step.
- Connect a jumper wire between speed control switch connector terminals No. 2 and 3 (switch signal circuit and ground circuit). See Figure
- On all models, use scan tool to read speed control switch voltage. If scan tool displays 0.00V OFF, replace speed control switch. Perform TEST SC-VER . If scan tool does not display 0.00V OFF, ensure ignition is off.
- Disconnect Powertrain Control Module (PCM) connector. Check connector for damaged, pushed out or miswired terminals. Repair as necessary. Perform TEST SC-VER . If connector is okay, go to next step.
- Using an external ohmmeter, check 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 .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 - If resistance is greater than 5 ohms, disconnect clockspring-to-instrument panel harness connector. Connector is located on steering column below clockspring. Check connector for damaged, pushed out or miswired terminals. Repair as necessary. Perform TEST SC-VER .
- If connector is okay, check 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. Also, see WIRING DIAGRAMS . If resistance is less than 5 ohms, replace clockspring. Perform TEST SC-VER . If resistance is greater than 5 ohms, repair open in speed control switch signal circuit between clockspring harness connector terminal No. 3 and Gray PCM connector terminal C32. Perform TEST SC-VER . Also, refer to WIRING DIAGRAMS .