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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 [AJ] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • 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.
No ECT PID is higher than 112 °C {234 °F}: 

ECT PID is less than 82 °C {180 °F}  :
2
  • Connect WDS or equivalent to DLC-2.
  • Retrieve any DTCs.
  • Are there any DTCs displayed?
 Yes DTC is displayed: 
  • Go to appropriate DTC test.
No No DTC is displayed: 
  • Go to the next step.
3
  • Measure voltage at PCM terminal 5, 30, 29 (MTX), 31 (MTX) and 55.
  • Are voltage okay?
 Yes Go to Step 5.(MTX)
Go to the next step.(ATX)
No If PCM terminal 5 voltage is not as specified: 
  • Inspect A/C switch, refrigerant pressure switch and fan switch.

If PCM terminal 30 voltage is not as specified: 
  • Inspect refrigerant pressure switch (middle pressure).

If PCM terminal 29 voltage is not as specified: 
  • Inspect clutch switch.

If PCM terminal 31 voltage is not as specified: 
  • Inspect neutral switch.

If PCM terminal 55 voltage is not as specified: 
  • Inspect PSP switch.
4
  • Inspect indication of selector lever position at instrument cluster.
  • Does indicator lamp indicate properly selector lever position?
 Yes Go to the next step.
No Perform N position learning. (See NEUTRAL POSITION LEARNING .) If problem remains replace TR switch.
(See TCM REMOVAL/INSTALLATION .)
5
  • Is there air leakage felt or heard at intake-air system components while racing engine to higher speed?
 Yes Repair or replace parts as necessary.
No Inspect following:
  • Electronic throttle control system operation
  • Accelerator position sensor adjustment
6
  • 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.
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