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	Connect the M-MDS to the DLC-2 Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC test
1		No	No DTC is displayed: Go to the next step
2	Remove the fuel-filler pipe Make sure nonreturn valve is installed properly Inspect the nonreturn valve operation Is nonreturn valve normal?	Yes	Inspect for the following Improper use of fuel nozzle Fuel is not inserted correctly Inspect fuel shut-off valve
2		No	Nonreturn valve is installed improperly: Reinstall the nonreturn valve to proper position Nonreturn valve does not operate properly: Replace the nonreturn valve
3	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.