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 THAT THE ACCS PID IS OFF Switch the ignition ON (Engine running). A/C switch and defroster switch off. Access the ACCS PID using M-MDS. Is the PID state off?	Yes	Go to the next step.
3		No	ACCS input to PCM is requesting A/C. Inspect A/C system operation, then go to Step 12. (See A/C OPERATION CHECK MODE TABLE .)
4	INSPECT A/C RELAY CONNECTOR FOR POOR CONNECTOR Switch the ignition off. Disconnect the A/C relay connector Inspect for poor connection (such as damaged, pulled-out pins, corrosion, etc). Are there any malfunction?	Yes	Repair or replace suspected part, then go to Step 12.
4		No	Go to the next step.
5	INSPECT A/C RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Switch the ignition ON (Engine off). Measure voltage between A/C relay terminal E (wiring harness-side) and body ground. Is voltage B+ ?	Yes	Go to the next step.
5		No	Repair or replace suspected part, then go to Step 12.
6	INSPECT A/C RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Switch the ignition ON (Engine off). Remove the A/C relay. Measure voltage between A/C relay terminal A (wiring harness-side) and body ground. Is voltage B+ ?	Yes	Repair or replace suspected part, then go to Step 12.
6		No	Go to the next step.
7	INSPECT A/C RELAY CONTROL CIRCUIT FOR SHORT TO GROUND Install the A/C relay Switch the ignition off. Inspect continuity between A/C relay terminal A (wiring harness-side) and body ground. Is there continuity?	Yes	Repair or replace suspected part, then go to Step 12.
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION Switch the ignition off. Disconnect the PCM connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace suspected part, then go to Step 12.
8		No	Go to the next step.
9	INSPECT A/C RELAY CONTROL CIRCUIT FOR OPEN CIRCUIT Switch the ignition off. Inspect continuity between A/C relay terminal A (wiring harness-side) and PCM terminal 1W (wiring harness-side) Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace suspected part, then go to Step 12.
10	INSPECT A/C RELAY Inspect A/C relay (See RELAY INSPECTION .) Is A/C relay normal?	Yes	Go to the next step.
10		No	Replace the A/C relay. Start the engine. Turn on the A/C switch. Wait for 15 s . Turn off the A/C switch, then go to Step 12.
11	INSPECT FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Visually inspect for: Pushed out pins Corrosion Connect all the PCM connectors and verify that they seat correctly. Retrieve DTCs using the M-MDS. Is the PENDING CODE for this DTC present?	Yes	Go to the next step.
11		No	The system is correctly. Go to the next step.
12	VERIFY TROUBLESHOOTING OF DTC P0645:00 HAS BEEN COMPLETED Verify that all disconnected connectors reconnected Clear the DTC from the PCM memory using the M-MDS Perform the "KOEO or KOER self-test" using the M-MDS (See KOEO/KOER SELF TEST [MZI-3.7] ) Is the PENDING CODE for the DTC present?	Yes	Replace the PCM, then go to the next step (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
12		No	Go to the next step.
13	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] )
13		No	Troubleshooting completed