Misfire Detection Monitor Disabled

DTC P1309 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P1309	MISFIRE DETECTION MONITOR DISABLED
DETECTION CONDITION	P1309 indicates the misfire detection monitor is disabled, usually due to the input signal generated by the camshaft position sensor (CMP) when sensing the passage of teeth from the CMP wheel.
POSSIBLE CAUSE	Damaged CMP. Damaged PCM. ECT, MAF and CKP sensors.
HINT	CMP Sensor Description Magnetic transducer. Detects the position of the camshaft and identifies when piston No. 1 is on its compression stroke. A signal is then sent to the PCM and used for synchronizing the firing of sequential fuel injectors.
Courtesy of MAZDA MOTORS CORP.
Courtesy of MAZDA MOTORS CORP.

DTC P1309 DIAGNOSTIC PROCEDURE

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.