Engine Speed Does Not Return to Idle

Engine Speed Does Not Return to Idle

SYMPTOM: When a shift-down is performed, the engine speed does not smoothly return to the idling speed.

DIAGNOSTIC PROCEDURE





1. CHECK A/T FLUID LEVEL
Check A/T fluid level.

OK or NG
OK >> GO TO 2.
NG >> Refill ATF.

2. CHECK SELF-DIAGNOSTIC RESULTS Perform self-diagnosis. Refer to AT-85, "SELF-DIAGNOSTIC RESULT MODE". With Manufacturer's Scan Tool

Do the self-diagnostic results indicate front brake solenoid valve, direct clutch solenoid valve, ATF pressure switch 1, ATF pressure switch 5, accelerator pedal position sensor, vehicle speed sensor A/T (revolution sensor) and vehicle speed sensor MTR?
YES >> Check the malfunctioning system. Refer to "DTC P1757 FRONT BRAKE SOLENOID VALVE" P1757, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE" P1762, "DTC P1841 ATF PRESSURE SWITCH 1" P1841, "DTC P1845 ATF PRESSURE SWITCH 5" P1845, "DTC P1705 THROTTLE POSITION SENSOR" P1705, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)" P0720, "DTC P1721 VEHICLE SPEED SENSOR MTR" P1721.
NO >> GO TO 3.

3. CHECK A/T FLUID CONDITION





1. Remove oil pan.
2. Check A/T fluid condition.

OK or NG
OK >> GO TO 4.
NG >> GO TO 7.

4. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No.65) Symptom Chart.

OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.

5. CHECK SYMPTOM
Check again.

OK or NG
OK >> INSPECTION END
NG >> GO TO 6.

6. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection.
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.

OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.

7. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No.65) Symptom Chart.

OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.