Unique Idle Concern

UNIQUE IDLE CONCERN REFERENCE CHART

4	UNIQUE IDLE CONCERN
DESCRIPTION	Slow return to idle

DTC DETECTION CONDITION POSSIBLE COUSES CHART

STEP	INSPECTION		ACTION
1	PRELIMINARY CHECKS Carry out the following preliminary checks: Vacuum leaks Intake air system Electronic Throttle Body Are all the checks OK?	Yes	GO to the next step.
1		No	REPAIR as necessary. VERIFY symptom no longer exists.
2	CARRY OUT 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 DTC INDEX - PCM .
2		No	For 2.5L engine, GO to the next step. For 3.0L engine, GO to step 4.
3	CHECK PCV SYSTEM Remove PCV valve and shake it. Does PCV valve rattle?	Yes	REINSTALL PCV valve. GO to the next step.
3		No	INSTALL a new PCV valve.
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 1 minute. Does vacuum hold paper in place?	Yes	GO to the next step.
4		No	DISCONNECT evaporative hose. PLACE a stiff piece of paper over the hose. Wait 1 minute. Does vacuum hold paper in place? If yes, GO to step 2 of DTCs P0455 AND P1443: EVAPORATIVE EMISSION (EVAP) SYSTEM MALFUNCTION 01-01A-313 If no, CHECK for vacuum leaks, obstructions in the PCV system, oil cap, PCV valve, rocker cover bolt torque/gasket leak. REPAIR as required.