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 A/F SIGNAL AND A/F SENSOR GROUND REFERENCE CIRCUITS FOR OPEN CIRCUIT IN WIRING HARNESS Switch the ignition to off Disconnect the suspect A/F sensor connector. Disconnect the PCM connector. Measure the resistance between the following circuits For DTC P0130:00: A/F sensor (RH) terminal 5 and PCM terminal 2AC A/F sensor (RH) terminal 3 and PCM terminal 2AG For DTC P0150:00: A/F sensor (LH) terminal 5 and PCM terminal 2AE A/F sensor (LH) terminal 3 and PCM terminal 2AK Is the resistance less than 5 ohms?	Yes	Go to the next step.
3		No	Repair for an open circuit, then go to Step 7.
4	INSPECT A/F SIGNAL, A/F SENSOR GROUND REFERENCE, A/F SENSOR PUMPING CURRENT AND A/F SENSOR PUMPING CURRENT TRIM CIRCUITS FOR SHORT CIRCUIT TO GROUND IN WIRING HARNESS Measure the resistance between suspect A/F sensor terminals and ground. A/F sensor wiring harness-side connector terminal 1 A/F sensor wiring harness-side connector terminal 3 A/F sensor wiring harness-side connector terminal 5 A/F sensor wiring harness-side connector terminal 6 Is the resistance greater than 10 kilohms?	Yes	Go to the next step.
4		No	Repair for a short circuit, then go to Step 7.
5	INSPECT A/F SIGNAL, A/F SENSOR GROUND REFERENCE, A/F SENSOR PUMPING CURRENT AND A/F SENSOR PUMPING CURRENT TRIM CIRCUITS FOR SHORT CIRCUIT TO POWER SUPPLY IN WIRING HARNESS Switch the ignition to off. Measure the voltage between the suspect A/F sensor terminals and ground. A/F sensor wiring harness-side connector terminal 1 A/F sensor wiring harness-side connector terminal 3 A/F sensor wiring harness-side connector terminal 5 A/F sensor wiring harness-side connector terminal 6 Is any voltage present?	Yes	Repair for a short circuit, then go to Step 7.
5		No	Go to the next step.
6	INSPECT A/F SENSOR GROUND REFERENCE CIRCUIT FOR VOLTAGE Switch the ignition to off. Reconnect the PCM connector. Switch the ignition to ON (Engine off). Measure the voltage between suspect A/F sensor wiring harness-side connector terminal 3 and ground. Is the voltage between 2.4-2.6 V?	Yes	Replace the suspect A/F sensor, then go to the next step.
6		No	Go to the next step. (The system is operating normally at this time. The concern may have been caused by a loose or corroded connector.)
7	VERIFY TROUBLESHOOTING OF DTC P0130:00, P0150:00 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] .)
7		No	Go to the next step.
8	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] .)
8		No	Troubleshooting completed.