A/T Does Not Shift: D3->D4
A/T Does Not Shift: D3 -> D4SYMPTOM:
^ 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. CHECK 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
Perform self-diagnosis. Refer to AT-94, "SELF-DIAGNOSTIC RESULT MODE", With Manufacturer's Scan Tool AT-104, "Diagnostic Procedure Without CONSULT-II". Without Scan Tool
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system.
NO >> GO TO 3.
3. CHECK A/T FLUID LEVEL
Check A/T fluid level.
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.
4. CHECK LINE PRESSURE
Check line pressure at the engine stall point.
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.
2. Disassemble A/T.
3. Check the following.
- Oil pump assembly.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.
6. DETECT MALFUNCTIONING ITEM
1. Check control valve with TCM.
2. Disassemble A/T.
3. Check the following.
- 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.
2. Check A/T fluid condition.
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.
OK or NG
OK >> GO TO9.
NG >> Repair or replace damaged parts.
9. CHECK SYMPTOM
Check again.
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.
10. 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.
11. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts.
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.