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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. 1C.
  2. Voltage should be about zero volts or about 5 volts. If voltage is within specification, go to step 5). If voltage is not within specification, go to next step.
  3. Turn ignition off. Remove instrument cluster. Disconnect ECM harness connectors. Check continuity of Green/Red wire between terminal No. 1C on ECM connector and terminal No. 2K on instrument cluster harness connector. Repair as needed. If continuity exists, go to next step.
  4. With combination removed, measure continuity between terminals No. 2D and 2H on combination meter connector. If continuity exists, go to next step. If continuity does not exist, replace combination meter or circuit board (as applicable).
  5. Inspect VSS. See appropriate SYSTEM/COMPONENT TESTS - 2.3L article. Replace as needed. If VSS is okay, go to next step.
  6. 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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