A/T Does Not Shift: D5 -> D4

A/T Does Not Shift: 5th Gear -> 4th Gear

SYMPTOM: When shifted from M5 to M4 position in manual mode, does not downshift from 5th to 4th gear.

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to AT-96. "SELF-DIAGNOSTIC RESULT MODE", AT-107. "Diagnostic Procedure Without CONSULT-II".

Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system. Refer to "SELF-DIAGNOSTIC RESULT MODE", "Judgement Self-Diagnosis Code".
NO >> GO TO 2.

2. CHECK A/T FLUID LEVEL





Check A/T fluid level. Refer to "Checking A/T Fluid".
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.

3. CHECK CONTROL LINKAGE
Check the control linkage.
^ Refer to "Checking of A/T Position".

OK or NG
OK >> GO TO 4.
NG >> Adjust control linkage. Refer to AT-238. "Adjustment of A/T Position".

4. CHECK MANUAL MODE SWITCH
Check the manual mode switch. Refer to "DTC P1815 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. Refer to "Control Valve with TCM and A/T Fluid Temperature Sensor 2".





2. Check A/T fluid condition. Refer to "Fluid Condition Check".
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. Refer to "Symptom Chart" (Symptom No.14).

OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

7. CHECK SYMPTOM
Check again. Refer to "Cruise Test - Part 3".

OK or NG
OK >> INSPECTION END
NG >> GO TO 8.

8. CHECK TCM
1. Check TCM input/output signals. Refer to "TCM Input/Output Signal Reference Values".
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. Refer to "Symptom Chart" (Symptom No.14).

OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.