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. 9 FAST IDLE/RUNS ON DIAGNOSTIC PROCEDURE

STEP

INSPECTION

RESULTS

ACTION

Connect WDS or equivalent to DLC-2.
Access ECT PID.
Start and warm up engine to normal operating temperature.
Is ECT PID reading between 82-112°C {180-234°F}?

Yes

Go to the next step.

ECT PID is higher than 112°C {234°F}:
Go to symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS - OVERHEATING ".
ECT PID is less than 82°C {180°F}:
Go to symptom troubleshooting "NO. 18 COOLING SYSTEM CONCERNS - RUNS COLD ".

Connect WDS or equivalent to DLC-2.
Turn ignition switch to ON position (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.

Measure voltages at following PCM terminal.

5, 30, 55 (⁽¹⁾)
1AC, 1Q, 1R (MTX), 1W, 1Z
(See PCM INSPECTION .)

Is voltage normal?

Yes

Go to the next step.

If PCM terminal 5 ⁽¹⁾ , 1AC ⁽²⁾ voltage is not specified:
Inspect A/C switch, refrigerant pressure switch and fan switch.
If PCM terminal 30 ⁽¹⁾ , 1Q ⁽²⁾ voltage is not specified:
Inspect refrigerant pressure switch (middle pressure).
If PCM terminal 1R ⁽²⁾ voltage is not specified:
Inspect clutch pedal position switch.
If PCM terminal 1W ⁽¹⁾ voltage is not specified:
Inspect neutral switch (MTX), TR switch (ATX).
If PCM terminal 55 ⁽¹⁾ , 1Z ⁽²⁾ voltage is not specified:
Inspect P/S pressure switch.

Is there air leakage felt or heard at intake-air system components while racing engine to higher speed?

Yes

Repair or replace parts if necessary.

Inspect the following:

Electronic throttle control system operation
Accelerator position sensor adjustment

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