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 THE VOLTAGE AND GROUND CIRCUITS TO THE ELECTRONIC FUEL PUMP RELAY Switch the ignition off Disconnect the electronic fuel pump relay connector Switch the ignition to ON (Engine off) Measure the voltage between electronic fuel pump relay terminal G and A (wiring harness-side) Is the voltage greater than 10 V?	Yes	Go to Step 8.
3		No	Go to the next step.
4	INSPECT THE VOLTAGE TO ELECTRONIC FUEL PUMP RELAY Measure the voltage between electronic fuel pump relay terminal G (wiring harness-side) and body ground Is the voltage greater than 10 V?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT ELECTRONIC FUEL PUMP RELAY GROUND CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS Switch the ignition off Measure the resistance between electronic fuel pump relay terminal A (wiring harness-side) and body ground Is the resistance less than 5 ohms?	Yes	Unable to duplicate or identify the concern at this time
5		No	Repair for an open circuit, then go to Step 13
6	INSPECT FUEL PUMP RELAY FOR CORRECT OPERATION Switch the ignition off Disconnect the fuel pump relay connector Inspect the fuel pump relay (See RELAY INSPECTION ) Is there any malfunction?	Yes	Replace the fuel pump relay, then go to Step 13 (See RELAY LOCATION )
6		No	Go to the next step.
7	INSPECT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS Measure the voltage between fuel pump relay (wiring harness-side) and body ground Is the voltage greater than 10 V?	Yes	Go to Step 5.
7		No	A power supply circuit concern is present Inspect the condition of the related fuse/fuse links. If the fuse is normal, repair for an open circuit If the fuse/fuse link is damaged, inspect the circuit for a 1 short to ground before installing a new fuse/fuse link. Go to Step 13.
8	INSPECT FUEL PUMP MONITOR CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS Switch the ignition off Disconnect the PCM connector Measure the resistance between electronic fuel pump relay terminal D (wiring harness-side) and PCM terminal 1H (wiring harness-side) Is the resistance less than 5 ohms?	Yes	Go to the next step.
8		No	Repair for an open circuit, then go to Step 13
9	INSPECT FUEL PUMP MONITOR CIRCUIT FOR SHORT TO GROUND Measure the resistance between electronic fuel pump relay terminal D (wiring harness-side) and body ground Is the resistance greater than 10 kilohms?	Yes	Go to the next step.
9		No	Repair for a short circuit, then go to Step 13.
10	INSPECT FUEL PUMP MONITOR CIRCUIT FOR VOLTAGE Switch the ignition off. Measure the voltage between electronic fuel pump relay terminal D (wiring harness-side) and body ground Is any voltage present?	Yes	Repair for a short circuit, then go to Step 13.
10		No	Go to the next step.
11	INSPECT FUEL PUMP MONITOR CIRCUIT FOR CORRECT RESPONSE Switch the ignition off. Connect the PCM connector Switch the ignition to ON (Engine off). Measure the voltage between electronic fuel pump relay terminal D (wiring harness-side) and body ground Is the voltage greater than 10 V?	Yes	Replace the electronic fuel pump relay, then go to Step 13.
11		No	Go to the next step.
12	INSPECT FOR CORRECT PCM OPERATION Disconnect all the PCM connectors Visually inspect for Pushed out pins Corrosion Connect all the PCM connectors and verify that they seat correctly. Retrieve DTCs using the M-MDS Is the same DTC present?	Yes	Go to the next step.
12		No	Go to the next step. (The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.)
13	VERIFY TROUBLESHOOTING OF DTC U0109:00, U0109:01, U0109:02 HAVE 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 Perform the KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7] .) Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
13		No	Go to the next step.
14	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] .)
14		No	Troubleshooting completed.