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	INSPECT FOR POWER SUPPLY IN WIRING HARNESS Disconnect the suspect HO2S connector. Switch the ignition to ON (Engine off) Measure the voltage between the suspect HO2S connector terminal A and C, on the wiring harness side. Is the voltage more than 10 V?	Yes	Switch the ignition to off. Go to the next step.
3		No	Inspect the ENGINE fuse If the fuse deterioration, replace the fuse. If the fuse melts, repair for short to ground and replace the fuse If the fuse is normal, repair the open circuit. Go to Step 9.
4	INSPECT HO2S HEATER FOR SHORT TO GROUND Disconnect the PCM Measure the resistance between HO2S connector terminal A, the wiring harness side, and body ground Is the resistance more than 10 kilohms?	Yes	Go to the next step.
4		No	Repair or replace suspected part, Go to Step 9
5	INSPECT HO2S HEATER FOR SHORT IN WIRING HARNESS Measure the resistance between the following terminals HO2S terminal A (wiring harness-side) and HO2S terminal C (wiring harness-side) HO2S terminal A (wiring harness-side) and HO2S terminal D (wiring harness-side) HO2S terminal A (wiring harness-side) and HO2S terminal B (wiring harness-side) Are the resistances more than 10 kilohms?	Yes	Go to the next step
5		No	Repair or replace suspected part, Go to Step 9
6	INSPECT HO2S HEATER CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS For DTC P0054:00 Measure resistance between PCM terminal 3N and HO2S (RH) terminal A. For DTC P0060:00 Measure resistance between PCM terminal 3AM and HO2S (LH) terminal A. Is the resistance less than 5.0 ohms?	Yes	Go to the next step.
6		No	Repair or replace suspected part, Go to Step 9.
7	INSPECT INTERNAL RESISTANCE OF HO2S HEATER Measure the resistance between the suspect HO2S terminal A and C on the component side Is the resistance between 2-50 ohms?	Yes	Go to the next step.
7		No	Replace the suspect HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7] .) Go to Step 9.
8	INSPECT HO2S CASE FOR SHORT TO POWER SUPPLY, HTR, AND SIGNRTN Measure the resistance between the suspect HO2S terminal A and D on the component side. Measure the resistance between the suspect HO2S terminal A and body ground Is the resistance more than 10 kilohms?	Yes	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.)
8		No	Replace the suspect HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7] .) Go to the next step
9	VERIFY TROUBLESHOOTING OF DTC P0054:00, P0060:00 HAVE BEEN COMPLETED Verify that all disconnected connectors 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. 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] .)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [MZI-3.7] .) Are any DTC present?	Yes	Go to the applicable DTC inspection (See DTC TABLE [MZI-3.7] .)
10		No	Troubleshooting completed