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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. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Turn ignition off. Disconnect EGR boost sensor connector. Check for damaged or corroded sensor connector terminals. Repair as necessary, and go to step  7 . If connector terminals are okay, go to next step.
  3. Check for continuity between EGR boost sensor harness connector terminal "B" (Black/Yellow wire) and ground. If continuity is present, go to next step. If continuity is not present, check for open in Black/Yellow wire between EGR boost sensor and PCM. See WIRING DIAGRAMS article. Go to step  7 .
  4. Disconnect PCM connector. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step  7 . If connector terminals are okay, go to next step.
  5. Check for continuity between EGR boost sensor harness connector terminals "A" (Yellow/Black wire) and "C" (Gray/Red 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  7 .
  6. Check for continuity of Yellow/Black wire between EGR boost sensor harness connector terminal "A" and PCM harness connector terminal No. 34. See Figure . If continuity is present, go to next step. If continuity is not present, repair open in Yellow/Black wire. See WIRING DIAGRAMS article. Go to next step.
  7. Reconnect all connections. Turn ignition on. Clear DTCs. 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 P0108 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 P0108 is not present, go to next step.
  8. 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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