Test Description

WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.

Numbers below refer to the numbers in the Diagnostic Procedure:

1

IAC motor analyzer (J39027-A) is used to extend and retract IAC valve. Valve movement is verified by a change in engine speed. If no change in engine speed occurs, IAC valve can be resettled when removed from throttle body.

2

This step checks quality of IAC movement in step 1. Between 700-1500 RPM, engine speed should change smoothly with each flash of test light in both extend and retract directions. If IAC valve is retracted beyond control range (about 1500 RPM), it may take many flashes to extend IAC valve before engine speed will begin to drop. This is normal on certain engines. Fully extending IAC may cause engine to stall and may be considered normal.

6

Steps 1 and 2 , verified proper IAC valve operation. This step checks IAC circuits. Each lamp on noid light should flash red and green while IAC valve is cycled. While sequence of color is not important, if either light is OFF or does not flash red and green, check IAC circuits for faults, beginning with poor terminal contacts.