Chart C-2B Idle Speed Control (ISC) Check

Chart C-2B:

Idle Speed Control 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 J 29607.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This procedure checks for a high minimum air idle which could cause a sail-on condition. It is OK if engine cannot stay running at minimum air idle.
2. Follow PCM DTC 30 diagnosis to identify the cause of a faulty ISC motor.
3. This procedure determines ISC authority. This is determined by comparing the minimum air TPS value to the maximum ISC extend value. ISC authority should be adjusted to 10°-11° of throttle angle.
4. IDLE LEARN procedure must be performed after ISC plunger adjustment. Service and Repair