Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE SYMPTOM TROUBLESHOOTING - (3 OF 5)DTC APPLICATION CHART - POWERTRAIN CONTROL MODULE (PCM)MISFIRE DETECTION MONITOR DISABLED

2006 Mazda B4000 Base, Automatic

Misfire Detection Monitor Disabled

2006 Mazda B4000 Base, AutomaticSECTION 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.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.