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 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 repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT EGR VALVE CONNECTOR CONDITION Switch the ignition to off. Disconnect the EGR valve connector Inspect for poor connection (such as damaged/pulled-out pins, corrosion) Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 10.
3		No	Go to the next step.
4	INSPECT EGR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT Switch the ignition to ON (engine off). Measure the voltage between the following terminals and body ground: EGR valve terminal C (wiring harness-side) EGR valve terminal D (wiring harness-side) Is the voltage B+?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for a possible short to ground or open circuit, then go to Step 10.
5	INSPECT PCM CONNECTOR CONDITION 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 and/or connector, then go to Step 10.
5		No	Go to the next step
6	INSPECT EGR CONTROL CIRCUIT FOR SHORT TO GROUND Inspect for continuity between the following terminals and body ground EGR valve terminal E (wiring harness-side) EGR valve terminal A (wiring harness-side) EGR valve terminal B (wiring harness-side) EGR valve terminal F (wiring harness-side) 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 EGR CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Switch the ignition to ON (engine off) Measure the voltage between the following terminals and body ground. EGR valve terminal E (wiring harness-side) EGR valve terminal A (wiring harness-side) EGR valve terminal B (wiring harness-side) EGR valve terminal F (wiring harness-side) Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 10
7		No	Go to the next step
8	INSPECT EGR VALVE Inspect the EGR valve (See EGR VALVE INSPECTION [L5] .) Is there any malfunction?	Yes	Replace the EGR valve, then go to Step 10. (See EGR VALVE REMOVAL/INSTALLATION [L5] .)
8		No	Go to the next step
9	INSPECT EGR CONTROL CIRCUIT FOR OPEN CIRCUIT Switch the ignition to off. Inspect for continuity between the following terminals EGR valve terminal E (wiring harness-side) and PCM terminal 2AX (wiring harness-side) EGR valve terminal A (wiring harness-side) and PCM terminal 2BA (wiring harness-side) EGR valve terminal B (wiring harness-side) and PCM terminal 2AT (wiring harness-side) EGR valve terminal F (wiring harness-side) and PCM terminal 2AW (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 DTC TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Perform the KOEO/KOER self test (See KOEO/KOER SELF TEST [L5] .) Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L5] .)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE" (See AFTER REPAIR PROCEDURE [L5] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection (See DTC TABLE [L5] .)
11		No	DTC troubleshooting completed