Idle/Throttle Speed Control Unit: Testing and Inspection

Chart 6C-7:

ISC Circuit:

CIRCUIT DESCRIPTION
The Idle Speed Control (ISC) Check verifies proper ISC motor operation and checks ISC plunger adjustment. This check requires ISC adjusting wrench J29607.

NOTES ON FAULT TREE
1. This procedure checks for a high minimum air idle which could cause a sail-on condition. Minimum air idle should be 450-500 rpm.

2. Follow PCM Trouble Code P030 diagnosis to identify the cause of a faulty ISC motor.

3. This procedure determines ISC motors ability to reach maximum extension. At maximum extension PD01 should read 13.0 - 13.8 degrees. If it does not, adjust to within range.

4. TP SENSOR/IDLE LEARN procedure must be performed after ISC plunger adjustment.