Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related Service Bulletins available?	Yes	Perform repair or diagnosis according to the available Service Bulletins If the vehicle is not repaired, go to the next step.
2		No	Go to the next step
3	VERIFY RELATED PENDING CODE OR STORED DTCs Switch the ignition to off, then to the ON (Engine off) Verify related pending code or stored DTCs. Are other DTCs present?	Yes	Go to the appropriate DTC troubleshooting. (See DTC TABLE [MZI-3.7] .)
3		No	Go to the next step.
4	INSPECT CKP SENSOR SIGNAL SENT TO PCM NOTE: The battery should be fully charged and the starting system should be functioning properly. Switch the ignition to ON (Engine off) Access the PCM and monitor the RPM PID. Crank the engine Is the engine speed more than 150 RPM?	Yes	Go to Step 13. (The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.)
4		No	Go to the next step.
5	INSPECT TIMING COVER, CKP SENSOR AND EXTERNAL TRIGGER WHEEL (OUTSIDE TIMING COVER) FOR OBVIOUS PHYSICAL DAMAGE Switch the ignition to off. Visually check the timing cover, CKP sensor and external trigger wheel (outside the timing cover) for obvious physical damage. Do any parts appear physically damaged?	Yes	Repair if necessary. Then go to Step 13.
5		No	Go to the next step.
6	INSPECT FOR PROPER CKP BIAS VOLTAGES IN PCM Disconnect the CKP sensor connector Switch the ignition to ON (Engine off) Measure the voltage between: CKP sensor terminal A on the wiring harness side and battery negative CKP sensor terminal B on the wiring harness side and battery negative Are the voltages between 1-3 V?	Yes	Go to the next step.
6		No	Go to Step 9.
7	INSPECT CKP SENSOR RESISTANCE Switch the ignition to off Measure the resistance between CKP sensor terminal A and B on the component side Is the resistance between 575-790 ohms?	Yes	Go to the next step.
7		No	Replace the CKP sensor. Then go to Step 13.
8	INSPECT CKP WIRING HARNESS SHIELD CIRCUIT FOR SHORT TO GROUND NOTE: The wiring harness shield protects the CKP signal from electrical noise and is grounded at one end, typically near the PCM NOTE: Perform the following resistance measurement between the CKP shield and the ground Measure the resistance between CKP_SHLD assembly connector wiring harness side and ground Is the resistance less than 5 ohms?	Yes	Go to the next step.
8		No	Repair the short circuit. Check for a poor ground. Then go to Step 13.
9	INSPECT FOR SHORT BETWEEN CKP (+) AND CKP (-) IN WIRING HARNESS Switch the ignition to off. Disconnect the PCM connector. Measure the resistance between: CKP sensor terminal A and B on the wiring harness side Is the resistance more than 10 kilohms?	Yes	Go to the next step.
9		No	Repair for a short circuit, Then go to Step 13.
10	INSPECT CKP CIRCUIT(S) FOR OPEN CIRCUIT IN WIRING HARNESS Measure the resistance between: CKP sensor connector A on the wiring harness side and PCM terminal 2V CKP sensor connector B on the wiring harness side and PCM terminal 2R Are the resistances less than 5 ohms?	Yes	Go to the next step.
10		No	Repair for an open circuit, Then go to Step 13
11	INSPECT CKP CIRCUIT(S) FOR SHORT TO GROUND IN WIRING HARNESS Measure the resistance between: CKP sensor connector A on the wiring harness side and battery negative CKP sensor connector B on the wiring harness side and battery negative Are the resistances more than 10 kilohms?	Yes	Go to the next step
11		No	Repair for a short to ground, Then go to Step 13 4
12	INSPECT CKP CIRCUIT FOR SHORT TO VOLTAGE IN WIRING HARNESS Switch the ignition to ON (Engine off) Measure the voltage between. CKP sensor connector A on the wiring harness side and battery negative CKP sensor connector B on the wiring harness side and battery negative Are any voltage present?	Yes	Repair for a short to power supply, Then go to Step 13.
12		No	Go to the next step (The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.)
13	VERIFY TROUBLESHOOTING OF DTC P0320:00 HAS BEEN COMPLETED Verify that all disconnected connectors are reconnected Switch the ignition to ON (Engine off). Clear the DTC from the PCM memory using the M-MDS. Start the engine and run it at idle. Retrieve DTCs using the M-MDS Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
13		No	Go to the next step.
14	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [MZI-3.7] ) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7] .)
14		No	Troubleshooting completed.