A/T Does Not Shift: D3 -> D4

A/T Does Not Shift: D3 -> D4

SYMPTOM:
^ The vehicle does not shift-up from the D3 to D4 gear at the specified speed.
^ The vehicle does not shift-up from the D3 to D4 gear unless A/T is warmed up.

DIAGNOSTIC PROCEDURE
1. CONFIRM THE SYMPTOM
Check if vehicle creeps forward in "D" position" and vehicle can be started from D1.
OK or NG
OK >> GO TO 2.
NG >> Refer to "Vehicle Does Not Creep Forward In "D" Position", "Vehicle Cannot Be Started From D1".

2. CHECK SELF-DIAGNOSTIC RESULTS
Execute self-diagnosis.
Do the self-diagnostic results indicate ATF pressure switch 1, ATF pressure switch 3, front brake solenoid valve, input clutch solenoid valve, accelerator pedal position sensor, vehicle speed sensor A/T (revolution sensor) and vehicle speed sensor MTR?
YES >> Check the malfunctioning system. Refer to "DTC P1841 ATF PRESSURE SWITCH 1 ", "DTC P1843 ATF PRESSURE SWITCH 3", "DTC P1752 INPUT CLUTCH SOLENOID VALVE", "DTC P1757 FRONT BRAKE SOLENOID VALVE", "DTC P1705 THROTTLE POSITION SENSOR", "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)", "DTC P1721 VEHICLE SPEED SENSOR MTR".
NO >> GO TO 3.

3. CHECK A/T FLUID LEVEL





Check A/T fluid level again. Refer to "Checking A/T Fluid".
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.

4. CHECK LINE PRESSURE





Check line pressure at the engine stall point. Refer to "LINE PRESSURE TEST".
OK or NG
OK >> GO TO 7.
NG -1 >> Line pressure high. GO TO 5.
NG -2 >> Line pressure low. GO TO 6.

5. DETECT MALFUNCTIONING ITEM
1. Control valve assembly.
2. Disassemble A/T.
3. Check the following items:
- Oil pump assembly.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

6. DETECT MALFUNCTIONING ITEM
1. Control valve assembly.
2. Disassemble A/T.
3. Check the following items:
- Oil pump assembly.
- Power train system.
- Transmission case.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

7. CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to "Control Valve Assembly".





2. Check A/T fluid condition. Refer to "Fluid Condition Check".
OK or NG
OK >> GO TO 8.
NG >> GO TO 11.

8. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No. 12).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.

9. CHECK SYMPTOM
Check again.
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.

10. PERFORM TCM INSPECTION
1. Perform TCM input/output signal inspection. Refer to "TCM Input/Output Signal Reference Values"
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.

11. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No.12).
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.