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 Fuel quality Coolant level Brake dragging Are all 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 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 [MZI-3.7] .)
2		No	No DTC is displayed: Go to the next step.
3	Access ECT PID. Drive vehicle while monitoring PID. (See PCM INSPECTION [MZI-3.7] .) Is PID within specification?	Yes	Go to the next step.
3		No	Inspect for coolant leakage, cooling fan and condenser fan operations or thermostat operation.
4	Perform the spark test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] .) Is strong blue spark visible at each cylinder?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning part according to spark test result.
5	Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? (See FUEL LINE PRESSURE INSPECTION [MZI-3.7] .)	Yes	Go to the next step.
5		No	Low: Perform "Fuel Pump Operation Inspection" and "Fuel Pump Control System Operation Inspection", repair or replace according to inspection results. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .) High: Perform "Fuel Pump Operation Inspection" and "Fuel Pump Control System Operation Inspection", repair or replace according to inspection results. If there is no malfunction, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .)
6	Inspect for variable valve timing control system operation. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] .) Does the variable valve timing control system function properly?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning part.
7	Remove and shake the PCV valve Does the PCV valve rattle?	Yes	Go to the next step.
7	Remove and shake the PCV valve Does the PCV valve rattle?	No	Replace the PCV valve.
8	Visually inspect the exhaust system part. Is there any deformed exhaust system?	Yes	Replace the suspected part.
8		No	Go to the next step.
9	Inspect for contaminated MAF sensor. Is there any contamination?	Yes	Go to the next step.
9		No	Inspect for cause.
10	Inspect the MAF sensor for contamination. Is there any contamination?	Yes	Replace MAF sensor.
10		No	Go to the next step.
11	Is engine compression correct?	Yes	Inspect the valve timing.
11	Is engine compression correct?	No	Inspect for cause
12	Verify test results. If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] .) If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed If vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest