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 RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information If the vehicle is not repaired, go to the next step
1		No	Go to the next step.
2	INSPECT VARIABLE INTAKE AIR SOLENOID VALVE CONNECTOR CONDITION Switch the ignition to off Disconnect the variable intake air solenoid valve connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 6
2		No	Go to the next step.
3	INSPECT PCM CONNECTOR CONDITION Disconnect the PCM connector Inspect for poor connection (such as damaged/pulled-out pins, corrosion) Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 6
3		No	Go to the next step.
4	INSPECT VARIABLE INTAKE AIR SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Switch the ignition to ON (engine off). Measure the voltage between PCM terminal 2J (wiring harness-side) and body ground Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 6.
4		No	Go to the next step.
5	INSPECT VARIABLE INTAKE AIR SOLENOID VALVE Inspect the variable intake air solenoid valve (See VARIABLE INTAKE AIR SOLENOID VALVE INSPECTION [L5] .) Is there any malfunction?	Yes	Replace the variable intake air solenoid valve, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5] .)
5		No	Go to the next step
6	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Access the RPM PID using the M-MDS Increase the engine speed more than 4, 750 RPM for 10 times Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [L5] .) Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L5] .)
6		No	Go to the next step.
7	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE" (See AFTER REPAIR PROCEDURE [L5] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection (See DTC TABLE [L5] .)
7		No	DTC troubleshooting completed