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 DIAGNOSTIC PROCEDURE

STEP

INSPECTION

RESULTS

ACTION

Does engine idle roughly?

Yes

Go to symptom troubleshooting "NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE ".

Go to the next step.

Turn off A/C switch and fan switch.
Does A/C magnetic clutch engage?

Yes

Go to symptom troubleshooting "NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY ".

Go to the next step.

Verify the following:

Proper routing of and no damage to vacuum lines
No air leakage from intake-air system

Are all items normal?

Yes

Go to the next step.

Service if necessary.
Repeat Step 3.

Connect WDS or equivalent to DLC-2.
Turn ignition switch to ON (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?

Yes

DTC is displayed:
Go to appropriate DTC test.

No DTC is displayed:
Go to the next step.

Perform electronic throttle control system operation inspection.
(See ELECTRONIC THROTTLE CONTROL SYSTEM INSPECTION .)
Does electronic throttle control system work properly

Yes

Go to the next step.

Repair or replace malfunctioning part according to electronic throttle control system operation inspection results.

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.

Go to the next step.

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 normal?

Yes

Go to the next step.

APP1, APP2 PIDs: Inspect accelerator position sensor.
TP_REL PID: Inspect TP sensor.
MAF PID: Inspect MAF sensor.
VSS PID: Inspect VSS.

Measure voltage at following PCM terminal.

82 (⁽¹⁾)
1K, 1R (MTX), 1W (⁽²⁾)
(See PCM INSPECTION .)

Is voltage normal?

Yes

Intermittent concern exists.
(See INTERMITTENT CONCERN TROUBLESHOOTING .)

If PCM terminal 82 ⁽¹⁾ , 1K ⁽²⁾ voltage is not as specified:
Inspect brake switch.
If PCM terminal 1R ⁽²⁾ voltage is not as specified:
Inspect clutch pedal position switch.
If PCM terminal 1W ⁽²⁾ voltage is not as specified:
Inspect neutral switch (MTX), TR switch (ATX).

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.

⁽¹⁾	California emission regulation applicable ATX model

⁽²⁾	Except for California emission regulation applicable ATX model