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Home >> Mazda >> 2002 >> 626 ES, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5L >> Diagnostic Tests >> DTC P0068: TP Sensor Inconsistent With MAF Sensor >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME DATA has been recorded. Check for related service bulletins. Repair as necessary and go to next step.
  2. Start engine. Using scan tool, check Engine Coolant Temperature (ECT), TP and MAF PID data. Allow engine to reach 176°F (80°C) or more. Read TP PID data when MAF PID is more than 55 percent. If TP PID data is less than 4.82 percent, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If TP PID data is 4.82 percent or more, check TP sensor operation. Ensure TP sensor resistance changes smoothly while gradually opening throttle valve. Replace as necessary and go to step  5 . If TP sensor operates properly, go to next step.
  3. Turn ignition off. Disconnect MAF sensor connector. Check for loose, damaged or corroded connector terminals. Repair as necessary, and go to step  5 . If connector terminals are okay, go to next step.
  4. Disconnect PCM connector. Check for loose, damaged or corroded connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
  5. Reconnect all connections. Turn ignition on. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0068 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 P0068 is not present, go to next step.
  6. 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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