NO.6 SLOW RETURN TO IDLE [G6]

id010395850000

6

SLOW RETURN TO IDLE

DESCRIPTION

The engine takes more time than normal to return to the idle speed.

POSSIBLE CAUSE

•  ECT sensor malfunction

•  Thermostat is stuck open.

•  Throttle body malfunction

•  Air leakage from intake-air system

6	SLOW RETURN TO IDLE
DESCRIPTION	The engine takes more time than normal to return to the idle speed.
POSSIBLE CAUSE	• ECT sensor malfunction • Thermostat is stuck open. • Throttle body malfunction • Air leakage from intake-air system

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: • Go to appropriate the DTC inspection. (See DTC TABLE [G6].)
1		No	No DTC is displayed: • Inspect instrument cluster operation. (See INSTRUMENT CLUSTER INSPECTION.)
2	Remove the thermostat and inspect operation. (See THERMOSTAT REMOVAL/INSTALLATION [G6].) (See THERMOSTAT INSPECTION [G6].) Is the thermostat normal?	Yes	Engine coolant temperature and thermostat are normal. Go to the next step.
2		No	Access ECT PID on M-MDS. Inspect for both ECT PID and temperature gauge on the instrument cluster readings. • If the temperature gauge on the instrument cluster indicates normal range but ECT PID is not same as temperature gauge reading, inspect the ECT sensor. • If the temperature gauge on the instrument cluster indicates cold range but ECT PID is normal, inspect the temperature gauge and the heat gauge unit.
3	Is the throttle body free of contaminations?	Yes	Inspect for air leakage from intake-air system components while racing the engine to higher speed.
3	Is the throttle body free of contaminations?	No	Clean or replace the throttle body.
4	• Verify test results. ― If normal, return to diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [G6].) ― If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle is repaired, troubleshooting completed. • If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [G6].)