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 availability. Is any related Service Bulletins available?	Yes	Perform repair or diagnosis according to available Service Bulletins. If vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT FUEL INJECTOR NO. 4 CONNECTOR FOR POOR CONNECTION Switch the ignition to off Disconnect the fuel injector No. 4 connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are there malfunction?	Yes	Repair or replace suspected part, then go to Step 10.
3		No	Go to the next step.
4	INSPECT PCM CONNECTOR FOR POOR CONNECTION Switch the ignition to off. Disconnect the PCM connector Inspect for poor connection (such as damaged/pulled-out pins, corrosion) Is there malfunction?	Yes	Repair or replace suspected part, then go to Step 10.
4		No	Go to the next step.
5	INSPECT FUEL INJECTOR NO. 4 POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Switch the ignition to ON (Engine off) Measure the voltage between fuel injector No 4 connector terminal B and body ground. Is the voltage greater than 10 V	Yes	Go to the next step.
5		No	Repair for an open circuit, then go to Step 10.
6	INSPECT FUEL INJECTOR NO. 4 SIGNAL CIRCUIT FOR OPEN INSPECT FOR OPEN CIRCUIT IN WIRING HARNESS Measure the resistance between fuel injector No 4 terminal A (wiring harness-side) and PCM terminal 2BG (wiring harness-side). Is the resistance less than 5 ohms?	Yes	Go to the next step.
6		No	Repair for an open circuit, then go to Step 10.
7	INSPECT FUEL INJECTOR NO. 4 SIGNAL CIRCUIT FOR SHORT TO GROUND IN WIRING HARNESS Measure the resistance between fuel injector No 4 connector terminal A (wiring harness-side) and body ground Is the resistance greater than 10 kilohms?	Yes	Go to the next step.
7		No	Repair for a short circuit, then go to Step 10.
8	INSPECT FUEL INJECTOR NO. 4 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY IN WIRING HARNESS Switch the ignition to ON (Engine off) Measure the voltage between fuel injector No. 4 terminal A (wiring harness-side) and body ground Is any voltage present?	Yes	Repair for a short circuit, then go to Step 10.
8		No	Go to the next step.
9	INSPECT FUEL INJECTOR NO. 4 Inspect the fuel injector No. 4. (See FUEL INJECTOR INSPECTION [MZI-3.7] .) Is there any malfunction?	Yes	Replace the fuel injector No. 4, then go to the next step.
9		No	Go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0204:00 HAS BEEN COMPLETED Verify that all disconnected connectors reconnected Clear DTC from memory using M-MDS. Start the engine Perform the "KOEO/KOER self-test" (See KOEO/KOER SELF TEST [MZI-3.7] ) Is same DTC present?	Yes	Replace the PCM, then go to the next step.
10		No	Go to the next step.
11	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] .)
11		No	Troubleshooting completed.