A/T Does Not Shift: D4 -> D3

A/T Does Not Shift: 4th Gear -> 3rd Gear

SYMPTOM: When shifted from M4 to M3 position in manual mode, does not downshift from 4th to 3rd gear.

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT-90, SELF-DIAGNOSTIC RESULT MODE. Self-Diagnostic Result Mode
Refer to AT-100, Diagnostic Procedure Without CONSULT-II. Displaying & Reading Trouble Codes
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system.
NO >> GO TO 2.

2. CHECK A/T FLUID LEVEL
Check A/T fluid level.
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.

3. CHECK CONTROL LINKAGE
Check the control linkage.
OK or NG
OK >> GO TO 4.
NG >> Adjust control linkage.

4. CHECK MANUAL MODE SWITCH
Check the manual mode switch.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.

5. CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
OK or NG
OK >> GO TO 6.
NG >> GO TO 9.

6. DETECT MALFUNCTIONING ITEM
Check the malfunction items. If any items are damaged, repair or replace damaged parts.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

7. CHECK SYMPTOM
Check again.
OK or NG
OK >> INSPECTION END
NG >> GO TO 8.

8. CHECK TCM
1. Check TCM input/output signals.
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.

9. DETECT MALFUNCTIONING ITEM
Check the malfunction items. If any items are damaged, repair or replace damaged parts.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.