Engine Speed Does Not Return to Idle (Light Braking D4-D3)

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 A/T selector lever is in 3 position.
^ 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. P1760
No >>GO TO 2.

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





Check throttle position sensor [accelerator pedal position (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.