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	VISUALLY INSPECT A/F SENSOR WIRING HARNESS NOTE: Disconnect the A/F sensor wiring harness connector. Only the suspect A/F sensor needs to be diagnosed. Switch the ignition to off Disconnect the A/F sensor connector Visually inspect the A/F sensor wiring harness. Check the connector (both halves) for contamination Make sure the connector pins are fully seated Is a concern present?	Yes	Repair if necessary. Go to Step 8.
3		No	Go to the next step.
4	INSPECT A/F SENSOR SIGNAL LEVEL TOO HIGH Connect HO2S connector Start the engine run it at idle. Access and monitor the following A/F sensor signal PIDs. P0132:00: O2S11 P0152:00: O2S21 Race the engine several times. Does the PID value change?	Yes	Go to the next step.
4		No	Go to Step 6.
5	PERFORM THOROUGH WIGGLE TEST ON A/F SENSOR WIRING HARNESS Switch the ignition to off. Switch the ignition to ON (Engine off). Access and monitor the A/F sensor signal PID at Step 4. Perform a thorough wiggle test on the A/F sensor wiring harness. Does the voltage change during the wiggle test?	Yes	Repair if necessary. Go to Step 8.
5		No	Perform the "INTERMITTENT CONCERN TROUBLESHOOTING". Then go to the next step.
6	INSPECT A/F SENSOR SIGNAL FOR SHORT CIRCUIT TO POWER SUPPLY INSIDE SENSOR Switch the ignition to off. Disconnect the suspect A/F sensor connector. Start the engine and run it at idle. Access and monitor the A/F sensor signal PID at Step 4. Race the engine several times. Does the PID value change?	Yes	Replace the suspect A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZI-3.7] .) Then go to Step 9.
6		No	Go to the next step.
7	INSPECT A/F SENSOR CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY IN WIRING HARNESS Switch the ignition to off Disconnect the PCM connector. Switch the ignition to ON (Engine off). Measure the voltage between suspect A/F sensor terminal 5 (wiring harness-side) and ground Is any voltage present?	Yes	Repair for a short circuit, then go to the next step.
7		No	Go to the next step. (The system is operating normal at this time The concern may have been caused by a loose or corroded connector.)
8	VERIFY TROUBLESHOOTING OF DTC P0132:00, P0152:00 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. Perform the KOER self-test (See KOEO/KOER SELF TEST [MZI-3.7] .) 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] .)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [MZI-3.7] ) Are any DTC displayed?	Yes	Go to the applicable DTC inspection (See DTC TABLE [MZI-3.7] )
9		No	Troubleshooting completed