A/T Does Not Shift D4 To D5

SYSTEM SYMPTOM


A/T Does Not Shift: D4 toD5


SYMPTOM:
- The vehicle does not shift-up from the D4 to D5 gear at the specified speed.
- The vehicle does not shift-up from the D4 to D5 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 D
OK or NG
OK - GO TO 2.
NG - Refer to D" Position", Vehicle Cannot Be Started From D1, "Vehicle Cannot Be
Started from D1".
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to Diagnosis System (TCM).
Do the self-diagnostic results indicate front brake solenoid valve, direct clutch solenoid valve, accelerator pedal position sensor, turbine revolution sensor, vehicle speed sensor A/T (revolution sensor) and vehicle speed sensor MTR?
YES - Check the malfunctioning system. Refer to P1757TM-84, "Diagnosis Procedure", P2138, P0717, P0720, P1721.
NO - GO TO 3.
3.CHECK A/T FLUID LEVEL





Check A/T fluid level. Refer to Checking The A/T Fluid (ATF), "Checking the A/T Fluid
(ATF)".
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. Check control valve with TCM. Refer to Service and Repair.
2. Disassemble A/T. Refer to Disassembly.
3. Check the following items:
- Oil pump assembly. Refer to Oil Pump.
OK or NG
OK - GO TO 7.
NG - Repair or replace damaged parts.
6.DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM. Refer to Service and Repair.
2. Disassemble A/T. Refer to Disassembly.
3. Check the following items:
- Oil pump assembly. Refer to Oil Pump.
- Power train system. Refer to Disassembly.
- Transmission case. Refer to Disassembly.
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 Service and Repair.





2. Check A/T fluid condition. Refer to Checking The A/T Fluid (ATF), "Checking the A/T
Fluid (ATF)".
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 Table (Symptom No.13).
OK or NG
OK - GO TO 9.
NG - Repair or replace damaged parts.
9.CHECK SYMPTOM
Check again. Refer to Cruise Test - Part 1.
OK or NG
OK >> INSPECTION END
NG - GO TO 10.
10.PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to A/T Control System.
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.
11.DETECT MALFUNCTIONING ITEM
- Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to Symptom Table (Symptom No.13).
OK or NG
OK - GO TO 9.
NG - Repair or replace damaged parts.