Engine Speed Does Not Return to Idle

15. Engine Speed Does Not Return To Idle (Light Braking D4 -> D3 )

SYMPTOM:
^ Engine speed does not smoothly return to idle when A/T shifts from D4 to D3.
^ Vehicle does not decelerate by engine brake when turning overdrive control switch OFF.
^ Vehicle does not decelerate by engine brake when shifting A/T from D to 2 position.

1. CHECK SELF-DIAGNOSTIC RESULTS





Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?
Yes or No
Yes >> Check overrun clutch solenoid valve circuit. Refer to "DTC P1760 OVERRUN CLUTCH SOLENOID VALVE".
No >> GO TO 2.

2. CHECK THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR]





Check throttle position sensor [accelerator pedal position (APP) sensor]. Refer to "DTC P0122, P0123 TP SENSOR" and "DTC P2138 APP SENSOR".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace throttle position sensor [accelerator pedal position (APP) sensor].

3. CHECK A/T FLUID CONDITION





1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.

4. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check the following items:
- Overrun clutch control valve
- Overrun clutch reducing valve
- Overrun clutch solenoid valve
3. Disassemble A/T.
4. Check the following items:
- Overrun clutch assembly
- Oil pump assembly
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

5. DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly.
2. Check the following items:
- Overrun clutch control valve
- Overrun clutch reducing valve
- Overrun clutch solenoid valve
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

6. CHECK SYMPTOM
Check again.
OK or NG
OK >> INSPECTION END
NG >> GO TO 7.

7. CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.