Test SC-8A: Checking Speed Control On/Off Switch
NOTE:
Perform TEST SC-7A
before proceeding.
- If speed control engage light does not illuminate, go to step 5). If speed control engage light illuminates, go to next step.
- Using scan tool, actuate speed control solenoids. If speed control solenoids are not clicking, go to step 5). If speed control solenoids are clicking, go to next step.
- Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Turn ignition on. Using external voltmeter, measure voltage of speed control sense circuit between PCM connector terminal No. 12 (Red/Black wire) and ground. If voltage is 9 volts or less, repair open speed control sense circuit (Red/Black wire) between speed control switch and PCM. Perform TEST SC-VER . If voltage is more than 9 volts, go to next step.
- Measure voltage of speed control light driver circuit between PCM connector terminal No. 22 (Light Green wire) and ground. If voltage is more than 9 volts, replace PCM. Perform TEST SC-VER . If voltage is 9 volts or less, repair open speed control light driver circuit (Light Green wire). Before searching for an open circuit, ensure speed control engage light bulb is okay. Perform TEST SC-VER .
- Turn ignition off. Access and disconnect 8-pin speed control ON/OFF switch connector. Turn ignition on. Using external voltmeter, measure voltage of fused ignition switch output circuit (Black/White wire) between speed control ON/OFF switch connector terminal No. 3 and ground. If voltage is 9 volts or less, repair open fused ignition switch output circuit (Black/White wire). Perform TEST SC-VER . If voltage is more than 9 volts, go to next step.
- Turn ignition off. Using an external ohmmeter, measure resistance of ground circuit between speed control ON/OFF switch connector terminal No. 4 (Black wire) and ground. If resistance is less than 10 ohms, replace speed control ON/OFF switch. Perform TEST SC-VER . If resistance is 10 ohms or more, repair open ground circuit (Black wire). Perform TEST SC-VER .