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	RESULTS	ACTION
1	Inspect for the following: Air cleaner element for contamination ATF level (ATX) Fuel quality Coolant level Brake dragging Clutch slippage (MTX) Are all the items normal?	Yes	Go to the next step.
1		No	Service if necessary. Repeat Step 1
2	Connect the M-MDS to the DLC-2. Switch the ignition to ON (Engine off). Retrieve any DTCs Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE [L5] .)
2		No	No DTC is displayed: Go to the next step
3	Access the ECT PID Drive the vehicle while monitoring the PID (See PCM INSPECTION [L5] .) Is PID within specification?	Yes	Go to the next step.
3		No	Inspect for coolant leakage, and inspect the cooling fan and condenser fan operations or and inspect the thermostat operation.
4	Perform the spark test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5] ) Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning part according to the spark test result.
5	Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L5] .) Is the fuel line pressure correct?	Yes	Go to the next step
5		No	Low: Inspect the fuel pump relay and the fuel pump circuit Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5] .) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5] .)
6	Inspect the variable tumble control operation (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5] ) Does the variable tumble control function properly?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning part
7	Inspect the variable valve timing control system operation (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5] ) Does the variable valve timing control system function properly?	Yes	Go to the next step
7		No	Repair or replace the malfunctioning part
8	Inspect the variable intake air control operation (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5] ) Does the variable intake air control function properly?	Yes	Go to the next step
8		No	Repair or replace the malfunctioning part
9	Remove and shake the PCV valve Does the PCV valve rattle?	Yes	Go to the next step
9	Remove and shake the PCV valve Does the PCV valve rattle?	No	Replace the PCV valve (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L5] .)
10	Visually inspect the exhaust system parts Are there any deformed exhaust system parts?	Yes	Replace the suspected part
10		No	Go to the next step.
11	Inspect the MAF sensor for contamination Is there any contamination?	Yes	Go to the next step
11		No	Inspect for cause
12	Inspect the MAF sensor for contamination Is there any contamination?	Yes	Replace the MAF/IAT sensor (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5] .)
12		No	Go to the next step.
13	Is the engine compression correct?	Yes	Inspect the valve timing.
13	Is the engine compression correct?	No	Inspect for cause
14	Verify test results If normal, return to the diagnostic index to service any additional symptoms (See SYMPTOM DIAGNOSTIC INDEX [L5] .) If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis If the vehicle is repaired, troubleshooting is completed. If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available Retest