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Home › Mazda › 1998 › B2500 SX, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - Testing › Diagnostic Trouble Codes › DTC P1309: Misfire Detection Monitor › Condition

DTC P1309: Misfire Detection Monitor: Condition

NOTE: DTC indicates misfire detection monitor malfunction.
  1. Turn ignition and all accessories off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Connect DVOM between test pin No. 85 and test pin No. 51 or 103 at breakout box. Using starter, bump engine in short bursts for at least 10 revolutions. DO NOT allow engine to start. If voltage switches from less than 2 volts to more than 8 volts, check CMP sensor for correct installation. If sensor is correctly installed, replace PCM. If voltage does not switch from less than 2 volts to more than 8 volts, replace CMP sensor. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS in TESTS W/CODES - INTRODUCTION article.

  2. Check CMP Sensor Output

    Turn ignition and all accessories off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950). Connect PCM to breakout box. Connect DVOM between test pin No. 85 and test pin No. 51 or 103 at breakout box. Start engine and vary engine speed. If A/C voltage varies more than .1 volt, check CMP sensor for correct installation. If sensor is correctly installed, replace PCM. If voltage does not vary more than .1 volt, replace CMP sensor. Perform MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS in TESTS W/CODES - INTRODUCTION article.
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