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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 P0453 is present, go to next step. If DTC P0453 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Disconnect FTP sensor connector. Check for loose, damaged or corroded connector terminals. Repair as necessary, and go to step  11 . If connector terminals are okay, go to next step.
  3. Check for continuity between FTP sensor harness connector terminal "A" (Black/Yellow wire) and ground. If continuity is present, go to step  5 . If continuity is not present, go to next step.
  4. Disconnect in-line 16-pin connector located at back of joint box. See Figure . Check for continuity between in-line 16-pin male connector terminal "K" (Black/Yellow wire) and ground. See Figure . If continuity is present, check for open in Black/Yellow wire between in-line 16-pin female connector terminal "K" and FTP sensor connector terminal "A". See Figure . Repair as necessary. See WIRING DIAGRAMS article. Go to step  11 . If continuity is not present, check for open in Black/Yellow wire between in-line 16-pin male connector terminal "K" and PCM connector terminal No. 91. See Figure . Repair as necessary. See WIRING DIAGRAMS article. Go to step  11 .
  5. Check for damaged or corroded in-line 16-pin connector terminals. Repair as necessary, and go to step  11 . If connector terminals are okay, go to next step.
  6. Check for continuity between in-line 16-pin female connector terminals "C" (Pink/Green wire) and "E" (Gray/Red wire). See Figure . If continuity is not present, go to next step. If continuity is present, repair Gray/Red wire to Pink/Green wire short, between in-line 16-pin connector and FTP sensor. See WIRING DIAGRAMS article. Go to step  11 .
  7. Check for continuity of Pink/Green wire between FTP sensor harness connector terminal "B" and in-line 16-pin female connector terminal "C". If continuity is present, go to next step. See Figure . If continuity is not present, repair Pink/Green wire. See WIRING DIAGRAMS article. Go to step  11 .
  8. Disconnect PCM connector. Check for loose, damaged or corroded connector terminals. Repair as necessary, and go to step  11 . If connector terminals are okay, go to next step.
  9. Check for continuity between in-line 16-pin male connector terminals "C" (Pink/Green wire) and "E" (Gray/Red wire). See Figure . If continuity is not present, go to next step. If continuity is present, repair Gray/Red wire to Pink/Green wire short, between in-line 16-pin connector and PCM. See WIRING DIAGRAMS article. Go to step  11 .
  10. Check for continuity of Pink/Green wire between PCM harness connector terminal No. 62 and in-line 16-pin male connector terminal "C". See Figure . If continuity is present, go to next step. If continuity is not present, repair open in Pink/Green wire. See WIRING DIAGRAMS article. Go to next step.
  11. Reconnect all connections. Turn ignition on. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs during KOEO and KOER self-test. If DTC P0453 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 P0453 is not present, go to next step.
  12. 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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