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Misfire Detection Monitor Disabled

NOTE: The following test procedures are for DTC P1309.

Fig 1: Misfire Detection Monitor Disabled Detection Condition Possible Cause

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Courtesy of MAZDA MOTORS CORP.

MISFIRE DETECTION MONITOR DISABLED INSPECTION/ACTION CHART

STEP	INSPECTION		ACTION
1	Was PCM Quick Test performed?	Yes	Go to next step.
1	Was PCM Quick Test performed?	No	Perform PCM Quick Test. See PCM QUICK TEST .
2	CHECK CMP SENSOR OUTPUT Disconnect PCM. Install Breakout Box and connect PCM. Start engine and vary engine RPM. Measure voltage between PCM test pin E25 (CMP) and PCM test pin C49 (PWR GND). Does the AC voltage vary greater than 0.1 V?	Yes	Verify the correct installation. See CAMSHAFT POSITION (CMP) SENSOR -- 2.3L . See CAMSHAFT POSITION (CMP) SENSOR -- 3.0L (4V) . If CMP is installed properly, replace PCM. See POWERTRAIN CONTROL MODULE (PCM) . Go to next step.
2		No	Replace CMP sensor. See CAMSHAFT POSITION (CMP) SENSOR -- 2.3L . See CAMSHAFT POSITION (CMP) SENSOR -- 3.0L (4V) .
3	VERIFY TROUBLESHOOTING OF DTCs COMPLETED Make sure to reconnect all disconnected connectors. Clear DTCs from PCM memory using WDS or equivalent tester generic OBD II function. Perform Misfire Monitor Drive Cycle. See DRIVE CYCLE . Is same DTC present?	Yes	Replace PCM and repeat PCM Quick Test. See PCM QUICK TEST .
3		No	If any other DTC is present, go to applicable DTC inspection. If no DTC is present, troubleshooting complete.