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	RESULTS	ACTION
1	Does the engine idle roughly?	Yes	Go to the symptom troubleshooting "No. 8 Engine runs rough/rolling idle". (See NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [L5] )
1	Does the engine idle roughly?	No	Go to the next step
2	Turn off the A/C switch and fan switch Does the A/C magnetic clutch engage?	Yes	Go to the symptom troubleshooting "No 24 A/C is always on or A/C compressor runs continuously." (See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L5] )
2		No	Go to the next step.
3	Verify the following Proper routing of and no damage to the vacuum lines No air leakage from the intake air system Are all items normal?	Yes	Go to the next step.
3		No	Service if necessary Repeat Step 3.
4	Connect the M-MDS to the DLC-2. Switch the 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 [L5] .)
4		No	No DTC is displayed: Go to the next step
5	Perform the electronic throttle control system operation inspection (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5] ) Does the electronic throttle control system function properly?	Yes	Go to the next step
5		No	Repair or replace the malfunctioning part according to electronic throttle control system operation inspection results
6	Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side Plug the open end of the vacuum hose Drive the vehicle Does the engine condition improve?	Yes	Inspect the evaporative emission control system.
6		No	Go to the next step.
7	Connect the M-MDS to the DLC-2 Access the APP1, APP2, TP_REL, MAF and VSS PIDs. Monitor each PID while driving the vehicle (See PCM INSPECTION [L5] .) Are the PIDs normal?	Yes	Go to the next step
7		No	APP1, APP2 PIDs: Inspect the APP sensor. TP_REL PID: Inspect TP sensor. MAF PID: Inspect MAF sensor VSS PID: Inspect VSS.
8	Connect the M-MDS to the DLC-2 Access the ACCS, COLR CPP/PNP and TR PIDs. Monitor each PID. (See PCM INSPECTION [L5] .) Are the PID normal?	Yes	Go to the next step.
8		No	ACCS PID: Inspect the A/C switch, refrigerant pressure switch and fan switch COLP PID: Inspect the refrigerant pressure switch (middle pressure) CPP PID: Inspect the clutch switch (MTX). CPP/PNP PID: Inspect the neutral switch (MTX). TR PID: TR switch (ATX).
9	Verify test results If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5] .) If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis If the vehicle is repaired, troubleshooting is completed. If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.