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Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Install Tech 2 scan tool. Turn ignition on, with engine off. Ensure engine is at normal operating temperature, transmission is in Park or Neutral, parking brake is set and A/C is off. Using scan tool, command IAC valve from 900 to 2000 RPM. If engine RPM changes smoothly, go to next step. If engine RPM does not change smoothly, go to step  5.
  3. Turn ignition off. Disconnect IAC valve harness connector. Remove IAC valve. Check resistance IAC windings between IAC valve terminals "A" and "B", and then terminals "C" and "D". See SYSTEM WIRING DIAGRAMS article. If one or both readings are not 40-80 ohms, go to step  13. If each reading is 40-80 ohms, go to next step.
  4. Measure resistance between IAC valve terminals "B" and "C", and then between terminals "A" and "D". See SYSTEM WIRING DIAGRAMS article. If each reading is infinite, go to step  15. If one or both readings are not infinite, go to step  13.
  5. Turn ignition on, with engine off. Disconnect IAC valve connector. With test light connected to ground, probe all 4 terminals at IAC valve harness connector. If test light illuminates on 2 terminals, go to next step. If test light does not illuminate on 2 terminals, go to step  7.
  6. With test light connected to positive battery terminal, probe all 4 terminals at IAC valve harness connector. If test light illuminates on 2 terminals, go to step  8. If test light does not illuminate on 2 terminals, go to step  9.
  7. Check for an open or short to ground in IAC valve low and high circuits. See SYSTEM WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  15. If circuits are okay, go to step  10.
  8. Start engine and allow it to idle. With test light connected to ground, probe all 4 terminals at IAC valve harness connector. If test light flashes on and off for all 4 terminals, go to step  11. If test light does not flash on and off for all 4 terminals, go to step  12.
  9. Check for an open or short to voltage in IAC valve low and high circuits. See SYSTEM WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  15. If circuits are okay, go to next step.
  10. Check PCM connector for poor terminal connections. Repair as necessary. After repairs, go to step  15. If connector is okay, go to step  14.
  11. Inspect IAC valve passages. Repair as necessary. After repairs, go to step  15. If IAC passages are okay, go to step  13.
  12. If test light remained on constantly for terminals that did not flash in step  8, go to step  9. If test light did not remain on constantly for terminals that did not flash, go to step  7.
  13. Replace IAC valve. After repair is completed, go to step  15.
  14. Replace PCM. Program replacement PCM using appropriate equipment. See PROGRAMMING . After replacing PCM, go to next step.
  15. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, then enter DTC P0506. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step  2.
  16. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time. See DIAGNOSTIC AIDS .
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