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Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs during KOEO and KOER self-test. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0103 is present, go to next step. If DTC P0103 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Disconnect MAF sensor connector. Check for damaged or corroded MAF sensor connector terminals. Repair as necessary, and go to step  6 . If connector terminals are okay, go to next step.
  3. Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal "E" (Red/Green wire).Figure If voltage is not present, go to next step. If voltage is present, check for short to power in Red/Green wire between MAF sensor and PCM. Repair as necessary and go to step  6 .
  4. Turn ignition off. Disconnect PCM connector. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step  6 . If connector terminals are okay, go to next step.
  5. Check for continuity of Brown/Red wire between MAF harness connector terminal "E" and PCM harness connector terminal No. 36. See Figure . If continuity is present, replace MAF sensor and go to next step. If continuity is not present, repair open in Brown/Red wire. See WIRING DIAGRAMS article. Go to next step.
  6. Reconnect all connections. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Perform KOEO self-test. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0103 is present, replace PCM and go to next step. See REMOVAL, OVERHAUL & INSTALLATION article. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION. If DTC P0103 is not present, go to next step.
  7. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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