Closed Throttle (Idle) Switch
NOTE:
It is important that all testing be done with Idle Speed Actuator (ISA) motor plunger in the fully extended position (as it would be after a normal engine shut down). See IDLE SPEED ACTUATOR (ISA) MOTOR in this article.
- Turn ignition switch to the "ON" position. Using a voltmeter, test closed throttle switch voltage at diagnostic connectors "D2" pin No. 13 and "D2" pin No. 7 (ground). See Fig 2 .
- On all models (except Wrangler) "D2" diagnostic connector is located on right fender well, behind relay block. On Wrangler model, "D2" connector is located on bracket, fender side of battery.
- Voltage should be close to zero at closed throttle and greater than 2 volts at any position other than closed throttle.
- If voltage is not present in either test, check for short to ground in wire harness or switch. If voltage is always greater than 2 volts, test for an open in wire harness between ECU and closed throttle switch connector and ground. Repair or replace wire harness as required.