Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NO. 10 LOW IDLE/STALLS DURING DECELERATION [AJ] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Does engine idle rough?	Yes	Go to symptom troubleshooting "NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE ".
1	Does engine idle rough?	No	Go to the next step.
2	Turn off A/C switch and fan switch. Does A/C magnetic clutch engage?	Yes	Go to symptom troubleshooting "NO. 24 A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY "?
2		No	Go to the next step.
3	Verify following: Proper routing and no damage to vacuum lines No air leakage from intake-air system Are all items okay?	Yes	Go to the next step.
3		No	Service as necessary. Repeat Step 3.
4	Connect WDS or equivalent to DLC-2. Turn ignition switch to ON position (Engine OFF). Retrieve any DTC. Are there any DTCs displayed?	Yes	DTC is displayed: Go to appropriate DTC test.
4		No	No DTC is displayed: Go to the next step.
5	Perform electronic throttle control system operation inspection. (See ELECTRONIC THROTTLE CONTROL INSPECTION .) Does electronic controlled throttle work properly?	Yes	Go to the next step.
5		No	Repair or replace malfunctioning part according to electronic throttle control system operation inspection results.
6	Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side. Plug opening end of vacuum hose. Drive vehicle. Does engine condition improve?	Yes	Inspect EVAP control system.
6		No	Go to the next step.
7	Connect WDS or equivalent to DLC-2. Access APP1, APP2, TP_REL, MAF and VSS PIDs. Monitor each PID while driving vehicle. (See PCM INSPECTION .) Are PIDs okay?	Yes	Intermittent concern exists. (See INTERMITTENT CONCERN TROUBLESHOOTING .)
7		No	APP1 or APP2 PIDs: Inspect APP sensor. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION .) TP_REL PID: Inspect TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION .) MAF PID: Inspect MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .) VSS PID: Inspect VSS. (See VEHICLE SPEEDOMETER SENSOR INSPECTION (WITHOUT ABS) .)
8	Verify test results. If okay, return to diagnostic index to service any additional symptoms. If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, reprogram PCM if later calibration is available. Retest.