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The IAC solenoid controls engine idle speed and dashpot functions by regulating the volume of air by-passing the throttle plate. IAC solenoid positioning is determined by signals sent from the PCM. On 2.0L models, a thermowax material is built into the unit to aid operation of IAC solenoid.
Perform this test when instructed by QUICK TEST or if directed by other test procedures. This test is intended to diagnose:
RPM during SELF-TEST mode.
IAC solenoid.
Wiring harness circuits (IAC and VPWR).
Powertrain Control Module (PCM).
To prevent replacement of good components, be aware the following non-EEC related areas may be at fault:
Engine temperature outside correct operating range.
A/C input (electrical problem).
Incorrect throttle stop adjustment.
Faulty throttle or cruise control linkage.
Continuous Memory Code 332 Code 332 indicates that within previous 80 warm-up cycles, PCM did not detect EGR flow at part throttle. Possible causes for this fault are:
Damaged or plugged vacuum line.
EGR valve stuck closed.
Damaged EGR pressure transducer.
Damaged or plugged exhaust tube.
Faulty EGRT sensor.
Open or shorted wiring harness circuit.
Turn ignition off. Disconnect vacuum hose at EGR valve. Connect vacuum pump to EGR valve. Apply 10 in. Hg to EGR valve. If vacuum is not held, repair or replace EGR valve. If vacuum is held, Release vacuum from EGR valve. Clear codes from PCM memory. Start engine. Apply 10 in. Hg to EGR valve, and hold 2 minutes. If engine does not idle rough or stall, clean or replace EGR valve
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Sunday, June 27th, 2010 AT 6:06 AM
