A/T Does Not Shift : 5th Gear To 4th Gear, When Lever Switch "OFF" To "ON"

TROUBLE DIAGNOSIS FOR SYMPTOMS


A/T Does Not Shift: 5th gear to 4th gear, When Lever Switch "OFF" to "ON"


SYMPTOM:
A/T does not shift from D5 to D4, when pushed lever switch to "ON" position. (O/D OFF indicator lamp "ON" and A/T indicator "4".)

DIAGNOSTIC PROCEDURE
1.CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to Inspections Before Trouble Diagnosis.
OK or NG
OK - GO TO 2.
NG - Refill ATF.
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis.
Is any malfunction detected by self-diagnostic?
YES - Check the malfunctioning system.
NO - GO TO 3.
3.DETECT MALFUNCTIONING ITEM
1. Control valve assembly. Refer to Service and Repair.
2. Disassemble A/T. Refer to Disassembly.
3. Check the following items:
- Forward and direct clutch assembly. Refer to Disassembly.
- 2nd coast brake. Refer to Service and Repair, One-Way Clutch Outer Race Sub Assembly And 2nd Coast Brake Hub And One-Way Clutch No.1,.
- One-way clutch No.1. Refer to One-Way Clutch Outer Race Sub Assembly And 2nd Coast Brake Hub And One-Way Clutch No.1,
OK or NG
OK - GO TO 4.
NG - Repair or replace damaged parts.
4.CHECK TCM
1. Check TCM input/output signal. Refer to Pinout Values and Diagnostic Parameters.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - GO TO 5.
NG - Repair or replace damaged parts.
5.CHECK SYMPTOM
Check again.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.