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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 574 (Symptom Troubleshooting (Engine - MZI-3.7)) >> No. 7 Slow Return To Idle [MZI-3.7] >> Diagnostic procedure

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 Connect the M-MDS to the DLC-2
Switch 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 [MZI-3.7] .)
No No DTC is displayed: 
Go to the next step.
2 Remove thermostat and inspect operation (See THERMOSTAT REMOVAL/INSTALLATION [MZI-3.7] .)
(See THERMOSTAT INSPECTION [MZI-3.7] .)
Is thermostat normal?		 Yes ECT and thermostat are normal
Go to the next step
No Replace the thermostat.
3 Is throttle body free of contamination? Yes Inspect for air leakage from the intake-air system components while racing the engine to higher speed.
No Clean or replace throttle body.
4
  • Verify test results
    • If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] .)
    • 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 the PCM If a later calibration is available Retest
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