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 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] .)
1		No	No DTC is displayed: Go to the next step
2	Make sure the nonreturn valve is installed properly Inspect nonreturn valve operation (See NONRETURN VALVE INSPECTION [MZI-3.7] .) Is the nonreturn valve normal?	Yes	Inspect for the following: Improper use of fuel nozzle Inadequate fuel filling speed
2		No	Nonreturn valve is installed improperly: Reinstall nonreturn valve to proper position. Nonreturn valve does not operate properly: Replace nonreturn valve
3	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