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Home >> Infiniti >> 2004 >> FX35 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Engine Controls - System & Component Testing) >> Fuel System >> Idle Air Control System Check (Rodeo & Rodeo Sport 2.2L) >> Diagnostic Procedure
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Diagnostic Procedure

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.
  1. Turn ignition off. Connect Tech 2 or equivalent scan tool to Data Link Connector (DLC). DLC is located under small cover on lower left side of instrument panel. Connect IAC motor analyzer (J39027-A) to IAC valve. Set parking brake. Block wheels. Turn A/C off. Start engine, and allow to idle. On scan tool, observe RPM. Using IAC motor analyzer extend and retract IAC valve. RPM should increase and decrease as IAC is cycled. If RPM changes as commanded, go to next step. If RPM does not change, go to step  3.
  2. RPM should change smoothly with each flash of IAC motor analyzer light. RPM should change from 700-1500 RPM. If RPM changes as specified, go to step  6. If RPM does not change as specified, go to step  5.
  3. Remove IAC valve. Check IAC passages for blockages. If problem is found, clean any obstructions as necessary. If no problem is found, go to next step.
  4. Replace IAC valve. See FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. After repair, retest system.
  5. Turn ignition off. Disconnect PCM Red 32-pin harness connector C1. PCM is located under center console in front of shifter. Following IAC motor analyzer instructions, install appropriate noid light to PCM harness connector. Turn ignition. Observe noid light while cycling IAC motor analyzer. Noid lights should cycle from red to green, but never off. If noid lights cycle as specified, go to next step. If noid lights do not cycle as specified, go to step  7.
  6. At IAC motor analyzer pigtail, use DVOM to measure resistance between terminals "A" and "B". Measure resistance between terminals "C" and "D". Resistance should be 40-80 ohms at both measurements. If resistance is as specified, go to step  8. If resistance is not as specified, go to step  9.
  7. Check for poor, loose or damaged terminal connections in IAC valve. Check for open, short to ground or short to voltage. Check for poor, loose or damage terminal connections in PCM. If problem is found, go to step  12.
  8. At IAC motor analyzer pigtail, measure resistance between terminals "B" and "C". Measure resistance between terminals "A" and "D". Resistance should be infinite. If resistance is as specified, go to step  10. If resistance is not as specified, go to step  11.
  9. Replace IAC valve. See FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. After repair, retest system.
  10. Check IAC valve and related circuits. If problem is found, check for intermittent problem. See DIAGNOSTIC AIDS . If no problem is found, go to next step.
  11. Replace IAC valve. See FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to step  8.
  12. Repair or replace faulty components. After repair, go to step  5.
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