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 HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on the 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 Service Bulletins available?	Yes	Perform repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step
2		No	Go to the next step
3	INSPECT FUEL PUMP POWER, FUEL PUMP RETURN AND INTERNAL FUEL PUMP CIRCUIT RESISTANCE Disconnect the electronic fuel pump relay connector. Measure the resistance between electronic fuel pump relay connector terminal H and B (wiring harness-side). Is the resistance less than 10 ohms?	Yes	Go to Step 6.
3		No	Go to the next step.
4	INSPECT FUEL PUMP POWER AND FUEL PUMP RETURN CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS Disconnect the fuel pump unit connector Measure the resistance between the following terminals. Electronic fuel pump relay terminal H (wiring harness-side) and fuel pump unit terminal B (wiring harness-side) Electronic fuel pump relay terminal B (wiring harness-side) and fuel pump unit terminal D (wiring harness-side) Is the resistance less than 5 ohms?	Yes	Go to the next step.
4		No	Repair for an open circuit, then go to Step 9.
5	INSPECT FUEL PUMP UNIT FOR OPEN CIRCUIT IN WIRING HARNESS Measure the resistance between fuel pump unit connector terminal B and D on the component side Is the resistance less than 10 ohms?	Yes	Go to the next step.
5		No	Replace the fuel pump unit, then go to Step 9. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] .)
6	INSPECT FUEL PUMP POWER CIRCUIT FOR SHORT CIRCUIT TO GROUND Measure the resistance between electronic fuel pump relay connector terminal H and ground. Is the resistance greater than 10 kilohms?	Yes	Go to the next step.
6		No	Repair a short to the ground circuit, then go to Step 9.
7	INSPECT FUEL PUMP POWER AND FUEL PUMP RETURN CIRCUIT FOR SHORT TO POWER SUPPLY Switch the ignition to ON (Engine off) Measure the voltage between the following terminals (wiring harness-side) and body ground. Electronic fuel pump relay terminal H Electronic fuel pump relay terminal B Is voltage B+?	Yes	Repair or replace suspected part, then go to Step 9.
7		No	Go to the next step.
8	INSPECT FUEL PUMP UNIT Inspect the fuel pump unit (See FUEL PUMP UNIT INSPECTION [MZI-3.7] .) Is there any malfunction?	Yes	Replace the fuel pump unit, then go to next step.
8		No	Replace the electronic fuel pump relay, then go to next step.
9	VERIFY TROUBLESHOOTING OF DTC P0627:00 HAS BEEN COMPLETED Verify that all disconnected connectors are reconnected. Switch the ignition to ON (Engine off). Clear the DTC from the PCM memory using the M-MDS. Retrieve DTCs using the M-MDS. Is the same DTC present?	Yes	Replace the PCM, then go to the next step (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [MZI-3.7] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection (See DTC TABLE [MZI-3.7] .)
10		No	Troubleshooting completed.