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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda MPV and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Record freeze frame data. Check for service bulletins and on-line information. Repair as necessary. After repair, go to next step.
  2. Inspect Poor Connection Of HO2S (Right Rear) Connector -  Turn ignition off. Disconnect right rear HO2S 4-pin harness connector. Check for damaged, loose or corroded terminals. If problem is not present, go to next step. If problem is present, repair as necessary. After repair, go to step  8.
  3. Inspect HO2S Heater (Right Rear) -  Measure resistance between right rear HO2S terminals "C" and "D". See Figure. If resistance is 14.1-18.9 ohms, go to next step. If resistance is not 14.1-18.9 ohms, replace right rear HO2S. After repair, go to step  8.
  4. Inspect HO2S Heater (Right Rear) Power Circuit For Open -  Turn ignition on, engine off. Measure voltage in Black/White wire between ground and right rear HO2S 4-pin harness connector terminal "C". If battery voltage is present, go to next step. If battery voltage is not present, repair open Black/White wire between right rear HO2S 4-pin harness connector terminal "C" and ignition switch. See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS. After repair, go to step  8.
  5. Inspect Poor Connection Of PCM Connector -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for damaged, loose or corroded terminals. If problem is not present, go to next step. If problem is present, repair as necessary. After repair, go to step  8.
  6. Inspect HO2S Heater (Right Rear) Control Circuit For Short To Ground -  Check continuity in Light Green wire between ground and right rear HO2S 4-pin harness connector terminal "D". If continuity is not present, go to next step. If continuity is present, repair short to ground in Light Green wire between right rear HO2S 4-pin harness connector terminal "D" and PCM 104-pin harness connector terminal No. 95. See Figure. After repair, go to step  8.
  7. Inspect HO2S Heater (Right Rear) Control Circuit For Open -  Connect 104-pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check continuity in Light Green wire between right rear HO2S 4-pin harness connector terminal "D" and breakout box terminal No. 95. If continuity is present, go to next step. If continuity is not present, repair open on Light Green wire between right rear HO2S 4-pin harness connector terminal "D" and PCM 104-pin harness connector terminal No. 95. After repair, go to next step.
  8. Verify Trouble Shooting Of DTC P0037 Completed -  Reconnect all connectors. Turn ignition on, engine off. Using scan tool, clear DTC from memory. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0037 is not present, go to next step. If DTC P0037 is present, replace PCM. After repair, go to next step.
  9. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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