Test SC-1C: Checking Speed Control Operation
NOTE:
Perform TEST CS-1A: CHECKING SPEED CONTROL OPERATION before proceeding.
- Turn ignition off. Observe vacuum gauge for 10 seconds. If vacuum holds for at least 10 seconds, go to next step. If vacuum does not hold for at least 10 seconds, replace vacuum check valve. Perform TEST VER-4A: SPEED CONTROL VERIFICATION .
- Inspect throttle cable. If throttle cable is disconnected or damaged, repair as necessary. Perform TEST VER-4A: SPEED CONTROL VERIFICATION . If throttle cable is not disconnected or damaged, go to next step.
- Turn ignition off. Disconnect speed control servo connector. Disconnect Powertrain Control Module (PCM) connector. Using a DVOM, check resistance of speed control vacuum solenoid control circuit between speed control servo connector and PCM connector terminal No. 56. See SPEED CONTROL SERVO CONNECTOR WIRE IDENTIFICATION table and PCM CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open speed control vacuum solenoid control circuit. Perform TEST VER-4A: SPEED CONTROL VERIFICATION .
- Using a DVOM, check resistance of speed control vent solenoid control circuit between speed control servo connector and PCM connector terminal No. 80. See SPEED CONTROL SERVO CONNECTOR WIRE IDENTIFICATION table and PCM CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, replace speed control servo. See TEST VER-4A: SPEED CONTROL VERIFICATION . If resistance is 5 ohms or more, repair open speed control vent solenoid control circuit. Perform TEST VER-4A: SPEED CONTROL VERIFICATION .
SPEED CONTROL SERVO CONNECTOR WIRE IDENTIFICATION
| Application | Wire Color |
|---|---|
| Brake Switch Output Circuit | Dark Blue/Red |
| Speed Control Vacuum Solenoid Control Circuit | Tan/Red |
| Speed Control Vent Solenoid Control Circuit | Light Green/Red |
| Ground | Black |
PCM CONNECTOR WIRE IDENTIFICATION
| Application | Wire Color | |
|---|---|---|
| PCM Terminal No. 56 | ||
| Speed Control Vacuum Solenoid Control Circuit | Tan/Red | |
| PCM Terminal No. 80 | ||
| Speed Control Vent Solenoid Control Circuit | Light Green/White | |