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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 P0122 is present, go to next step. If DTC P0122 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Disconnect TP sensor connector. Check for damaged or corroded sensor connector terminals. Repair as necessary, and go to step  12 . If connector terminals are okay, go to next step.
  3. Connect a fused jumper wire between TP sensor harness connector terminal "B" (Gray/Red wire) and terminal "C" (Violet/Yellow wire). Turn ignition on. Using scan tool check TP V PID data. If TP V PID data is 4.5-5.5 volts, go to next step. If TP V PID data is not 4.5-5.5 volts, go to step  5 .
  4. Turn ignition off and remove fused jumper wire. Check TP sensor operation. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. Replace as necessary and go to step  12 . If TP sensor is okay, go to step  12 .
    5. NOTE: If DTC P0107 and P0452 are also present, check reference voltage. See REFERENCE VOLTAGE TEST  .
  5. Turn ignition off and remove fused jumper wire. Turn ignition on. Measure voltage between ground and TP sensor harness connector terminal "B" (Gray/Red wire). If 4.5-5.5 volts are present, go to step  8 . If 4.5-5.5 volts are not present, go to next step.
  6. Turn ignition off. Disconnect PCM connector. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step  12 . If connector terminals are okay, go to next step.
  7. Check for continuity of Gray/Red wire between TP sensor harness connector terminal "B" and PCM harness connector terminal No. 90. See Figure . If continuity is present, go to step  12 . If continuity is not present, repair open in Gray/Red wire. See WIRING DIAGRAMS article. Go to step  12 .
  8. Check for continuity between ground and TP sensor harness connector terminal "C" (Violet/Yellow wire). If continuity is not present, go to next step. If continuity is present, repair short to ground in Violet/Yellow wire. See WIRING DIAGRAMS article. Go to step  12 .
  9. Check for continuity between TP sensor harness connector terminals "C" (Violet/Yellow wire) and "A" (Black/Yellow wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits. See WIRING DIAGRAMS article. Go to step  12 .
  10. Disconnect PCM connector. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step  12 . If connector terminals are okay, go to next step.
  11. Check for continuity of Violet/Yellow wire between TP sensor harness connector terminal "C" and PCM harness connector terminal No. 89. See Figure . If continuity is present, go to next step. If continuity is not present, repair open in Violet/Yellow wire. See WIRING DIAGRAMS article. Go to next step.
  12. 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. Perform KOEO and KOER self-test. If DTC P0122 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 P0122 is not present, go to next step.
  13. 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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