NO.7 SLOW RETURN TO IDLE [L3 R.H.D.]


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


STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs using the WDS or equivalent. Are any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE [L3 R.H.D.].)
1		No	No DTC is displayed: Go to the next step.
2	Remove the thermostat and inspect operation. (See THERMOSTAT REMOVAL/INSTALLATION [L3].) (See THERMOSTAT INSPECTION [L3].) Is the thermostat normal?	Yes	ECT sensor and thermostat are normal. Go to the next step.
2		No	Access the ECT PID on the WDS or equivalent. Inspect the readings of the ECT PID and temperature gauge on the instrument cluster. • If the temperature gauge indicates normal range but the ECT PID is not the same as temperature gauge reading, inspect the ECT sensor. • If the temperature gauge indicates cold range but the ECT PID is normal, inspect the temperature gauge and heat gauge unit.
3	Is the throttle body free of contaminations?	Yes	Inspect for air leakage from the intake-air system components while racing engine to a 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 the diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [L3 R.H.D.].) • If any malfunction remains, inspect related service information, and repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [L3].)