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-86, "SELF-DIAGNOSTIC RESULT MODE". Self-Diagnostic Result Mode
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 AT-139, "DTC P1757 FRONT BRAKE SOLENOID VALVE", AT-143, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE", AT-155, "DTC P1841 ATF PRESSURE SWITCH 1", AT-159, "DTC P1845 ATF PRESSURE SWITCH 5", AT-120, "DTC P1705 THROTTLE POSITION SENSOR", AT-107, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)", AT-128, "DTC P1721 VEHICLE SPEED SENSOR MTR".
P1757
P1762
P1841
P1845
P1705
P0720
P1721
NO >> GO TO 3.

3. CHECK A/T FLUID CONDITION
1. Remove oil pan.





2. Check A/T fluid condition. Refer to AT-51, "Fluid Condition Check". Fluid Condition Check
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 AT-61, "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. Refer to AT-55, "Check at Idle". Check at Idle
OK or NG
OK >> INSPECTION END
NG >> GO TO 6.

6. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-83, "TCM Input/Output Signal Reference Values". Pinout Values and Diagnostic Parameters
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 AT-61, "Symptom Chart" (Symptom No.65). Symptom Chart
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.