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 AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (misfire related) been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS 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	VERIFY RELATED PENDING AND STORED DTC Switch the ignition to off, then to ON (engine off) Verify pending and stored DTCs using the M-MDS. Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L5] .)
3		No	Go to the next step.
4	VERIFY CURRENT INPUT SIGNAL STATUS Access the following PIDs using the M-MDS. (See PCM INSPECTION [L5] .) APP1 APP2 ECT IAT MAF RPM TP REL VSS Is there any signal that is far out of specification when switch the ignition to ON and the engine idles?	Yes	Repair or replace the malfunctioning part according to inspection results, then go to Step 16.
4		No	Go to the next step.
5	VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION Access the following PIDs under FREEZE FRAME DATA condition. (See PCM INSPECTION [L5] .) APP1 APP2 ECT IAT MAF RPM TP REL VSS Is there any signal which causes drastic changes?	Yes	Repair or replace the malfunctioning part according to inspection results, then go to Step 16.
5		No	Go to the next step.
6	INSPECT IGNITION SYSTEM OPERATION Perform the spark test (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5] .) Is strong blue spark visible at each cylinder?	Yes	Go to Step 10.
6		No	Go to the next step.
7	INSPECT SPARK PLUG CONDITION Remove the spark plug. Inspect the spark plug. (See SPARK PLUG INSPECTION [L5] .) Is there any malfunction?	Yes	Replace the spark plug, then go to Step 16 (See SPARK PLUG REMOVAL/INSTALLATION [L5] .)
7		No	Go to the next step.
8	INSPECT IGNITION COIL RELATED WIRING HARNESS OR CONNECTOR CONDITION Inspect the ignition coil related wiring harness condition (intermittent open or short) for all cylinders and connector for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to inspection results, then go to Step 16.
8		No	Go to the next step.
9	INSPECT IGNITION COIL Inspect the ignition coil for all cylinders (See IGNITION COIL INSPECTION [L5] .) Is there any malfunction?	Yes	Replace the malfunctioning ignition coil, then go to Step 16. (See IGNITION COIL REMOVAL/INSTALLATION [L5] ).
9		No	Go to the next step.
10	INSPECT INTAKE AIR SYSTEM FOR AIR SUCTION Inspect for air leakage at the following: Around connection of dynamic chamber and intake manifold Around connection of intake manifold and cylinder head Is there any leakage?	Yes	Repair or replace the malfunctioning part according to inspection results, then go to Step 16.
10		No	Go to the next step.
11	INSPECT FUEL INJECTOR OPERATION Remove the intake air system parts Disconnect the fuel injector connector on suspected cylinder. Connect the NOID LIGHT to fuel injector terminals. Inspect dim of light during cranking Does the light illuminate?	Yes	Go to the next step.
11		No	Go to Step 14.
12	INSPECT FUEL INJECTOR RELATED WIRING HARNESS OR CONNECTOR CONDITION Inspect the fuel injector related wiring harness condition (intermittent open or short) and connector for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to inspection results, then go to Step 16.
12		No	Go to the next step.
13	INSPECT FUEL INJECTOR Remove the fuel injector. Switch the fuel injector with the fuel injector on other cylinder. Start the engine and idle it. Is the misfire DTC for cylinder which has a suspected fuel injector?	Yes	Replace the malfunctioning fuel injector, then go to Step 16. (See FUEL INJECTOR REMOVAL/INSTALLATION [L5] .)
13		No	Go to the next step.
14	INSPECT SEALING OF ENGINE COOLANT PASSAGE Perform the "ENGINE COOLANT LEAKAGE INSPECTION" (See ENGINE COOLANT LEAKAGE INSPECTION [L5] .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to inspection results, then go to Step 16.
14		No	Go to the next step
15	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION [L5] .) Is there any malfunction?	Yes	Perform the engine overhaul for repairs, then go to the next step.
15		No	Go to the next step.
16	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Start the engine and warm it up completely. Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L5] .)
16		No	Go to the next step.
17	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] .)
17		No	DTC troubleshooting completed