Part 2 of 2

DTC P030: Part 2 Of 2:

Throttle Position Switch Circuit:

CIRCUIT DESCRIPTION:
The PCM controls idle RPM by increasing or decreasing the throttle opening using the Idle Speed Control (ISC) motor. The ISC motor will control engine RPM any time the throttle position switch is closed. Code P030 sets because the actual RPM never reaches desired RPM signifying a slow or failed ISC motor.

NOTES ON FAULT TREE:
5. Checking the PCM's ability to control the ISC motor by checking for signal present at ISC motor.
6. Checking for an open or short to ground in CKT 425 or CKT 426.
7. Checking the PCM's ability to control the ISC motor by checking for signal present at ISC motor.
8. Checking if ISC motor is receiving the signal and is not responding to it correctly. Voltage should fluctuate continuously between a negative and positive value.