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Home >> Mazda >> 2005 >> Tribute s, 4WD >> Repair and Diagnosis >> Engine Performance >> Symptom Troubleshooting [Engine Control System] >> Unique Idle Concern
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Unique Idle Concern

UNIQUE IDLE CONCERN INSPECTION/ACTION CHART

4 UNIQUE IDLE CONCERN
DESCRIPTION
  • Slow return to idle
UNIQUE IDLE CONCERN INSPECTION/ACTION CHART

STEP INSPECTION ACTION
1 PRELIMINARY CHECKS
  • Perform the following preliminary checks:
    • Vacuum leaks.
    • Throttle linkage.
    • Intake air system.
    • Throttle body.
  • Are all the checks OK? 
 Yes Go to next step.
No Service as necessary.
Verify symptom no longer exists.
2 PERFORM PCM QUICK TEST
See PCM QUICK TEST  .
  • Are any DTCs displayed during Continuous Memory or Key On Engine Off (KOEO) Self-Tests? 
 Yes Check for cause.
See DIAGNOSTIC TROUBLE CODE NUMBERS  .
No Go to next step.
3 CHECK PCV SYSTEM
  • Remove PCV valve and shake it.
  • Does PCV valve rattle? 
 Yes Install PCV valve.
Go to next step.
No Replace PCV valve.
See POSITIVE CRANKCASE VENTILATION (PCV) VALVE -- 2.3L .
4 CHECK PCV SYSTEM
  • Start engine and bring to normal operating temperature. Disconnect crankcase ventilation hose from throttle body. Place a stiff piece of paper over the hose. Wait one minute.
  • Does vacuum hold paper in place? 
 Yes Go to next step.
No Disconnect evaporative hose. Place a stiff piece of paper over the hose. Wait one minute.
Does vacuum hold paper in place?
If yes, go to step 2 of See EVAPORATIVE EMISSION (EVAP) SYSTEM MALFUNCTION  step 9.
If no, check for vacuum leaks, obstructions in the PCV system, oil cap, PCV valve, rocker cover bolt torque/gasket leak. Service as required.
5
  • Verify test results. If OK, DIAGNOSTIC INDEX  to service any additional symptoms.
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