A/T Does Not Shift: D5 -> D4

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

SYMPTOM: When shifted from D5 to 4[4] position, does not downshift from 5th to 4th gears.

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis. Refer to AT-86, "SELF-DIAGNOSTIC RESULT MODE". Self-Diagnostic Result Mode
Do the self-diagnosis results indicate PNP switch, ATF pressure switch 1?
YES >> Check the malfunctioning system.
NO >> GO TO 2.

2. CHECK 4TH POSITION SWITCH CIRCUIT

With CONSULT-II





1. Turn ignition switch ON.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for A/T with CONSULT-II.
3. Read out OD CONT SW switch moving selector lever to each position.





Without CONSULT-II





1. Turn ignition switch ON. (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.





OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. CHECK A/T FLUID LEVEL





Check the A/T fluid level.
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.

4. CHECK CONTROL CABLE





Check the control cable.
OK or NG
OK >> GO TO 5.
NG >> Adjust control cable.

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. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-83, "TCM Input/Output Signal Reference Values". 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.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.