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 the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY Verify related Service Information availability. Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING OR STORED DTC Switch the ignition to off, then to the ON (Engine off). Verify the pending code or stored DTCs using the M-MDS. Is other DTC present?	Yes	Go to the appropriate DTC troubleshooting procedures (See DTC TABLE [MZI-3.7] .)
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P0131:00 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting procedures for DTC on FREEZE FRAME DATA. (See DTC TABLE [MZI-3.7] .)
5	INSPECT A/F SENSOR CONNECTOR FOR POOR CONNECTION Switch the ignition to off. Disconnect the A/F sensor connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 10.
5		No	Go to the next step.
6	INSPECT A/F SENSOR CIRCUIT FOR SHORT TO GROUND Switch the ignition to off. Inspect for continuity between the following terminals and body ground: A/F sensor terminal A (wiring harness-side) and body ground A/F sensor terminal B (wiring harness-side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 10.
6		No	Go to the next step.
7	INSPECT A/F SENSOR Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZI-3.7] .) Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 10. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZI-3.7] .)
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION Switch the ignition to off. Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 10.
8		No	Go to the next step.
9	INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT Switch the ignition to off. Inspect for continuity between the following circuits: A/F sensor terminal A (wiring harness-side) and PCM terminal 2Z (wiring harness-side) A/F sensor terminal B (wiring harness-side) and PCM terminal 2AD (wiring harness-side) Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0131:00 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Perform the "KOEO self-test". (See KOEO/KOER SELF TEST [MZI-3.7] .) Is the DTC P0131:00 present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
10		No	Go to the next step.
11	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] .)
11		No	DTC troubleshooting completed.