Misfire Detection Monitor Disabled

DTC P1309 DETECTION CONDITION & POSSIBLE CAUSES

DTC P1309	MISFIRE DETECTION MONITOR
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 powertrain control module (PCM) Engine coolant temperature (ECT), mass air flow (MAF) and crankshaft position (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.
Courtesy of MAZDA MOTORS CORP.

DTC P1309 DIAGNOSTIC PROCEDURE

DTC P1309		MISFIRE DETECTION MONITOR
STEP	INSPECTION		ACTION
1	Was the PCM quick test performed?	Yes	Go to next step.
1	Was the 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 85 (CMP) and PCM test pin 103 (PWR GND). Does the AC voltage vary greater than 0.1 V?	Yes	Verify the correct installation. See CAMSHAFT POSITION (CMP) SENSOR REMOVAL / INSTALLATION - 2.3L for 2.3L engine. See CAMSHAFT POSITION (CMP) SENSOR REMOVAL / INSTALLATION - 3.0L for 3.0L and 4.0L engines. If CMP is installed properly, replace PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . Go to next step.
2		No	Replace CMP sensor. See CAMSHAFT POSITION (CMP) SENSOR REMOVAL / INSTALLATION - 2.3L for 2.3L engine. See CAMSHAFT POSITION (CMP) SENSOR REMOVAL / INSTALLATION - 3.0L for 3.0L engine. Go to next step.
3	VERIFY TROUBLESHOOTING OF DTCs COMPLETED Connect all disconnected connectors. Clear DTCs from PCM memory using WDS or equivalent tester. Perform misfire monitor drive cycle. See DRIVE CYCLES . 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. See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) . If no DTC is present, troubleshooting is complete.