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Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect all applicable harness connectors. Repair as needed. Turn ignition on. Access ECM harness connector. ECM is mounted in front of center console, under radio. Using voltmeter, backprobe applicable ECM harness connector. Measure voltage between ground and terminal No. 4M.
  2. Voltage should be about one volt with ignition on or about 11 volts with engine idling at normal operating temperature. If voltage is within specification, go to step 6). If voltage is not within specification, go to next step.
  3. Disconnect IAC valve harness connector. Ensure ignition is on. Measure voltage between ground and terminal "A" on IAC valve harness connector. If battery voltage is present, go to next step. If battery voltage is not present, check for open or short in Red/Black wire between IAC valve and main relay.
  4. Turn ignition off. Disconnect ECM harness connectors. Check continuity of Blue/Black wire between terminal No. 4M on ECM connector and terminal "B" on IAC valve harness connector. Repair as needed. If continuity exists, go to next step.
  5. Check continuity between component terminals on IAC valve. If continuity exists, go to next step. If continuity does not exist, replace IAC valve.
  6. Inspect IAC valve. See appropriate SYSTEM/COMPONENT TESTS - 2.3L article. Replace as needed. If IAC valve is okay, go to next step.
  7. Erase DTCs. See CLEARING CODES  in SELF-DIAGNOSTIC SYSTEM section. If DTC resets, replace ECM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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