A/T Does Not Shift: 4TH Gear->3RD Gear

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

SYMPTOM: When shifted from D4 to 33 position, does not downshift from 4th to 3rd gears.

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis. Refer to AT-88, "SELF-DIAGNOSTIC RESULT MODE". With Manufacturer's Scan Tool
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfunctioning system. Refer to "SELF-DIAGNOSTIC RESULT MODE".
NO >> GO TO 2.
2. CHECK A/T FLUID LEVEL
Check the A/T fluid level. Refer to "Checking A/T Fluid".
OK or NG
OK >> GO TO 3.
NG >> Refill ATF.
3. CHECK CONTROL CABLE
Check the control cable.
^ Refer to "Checking of A/T Position".
OK or NG
OK >> GO TO 4.
NG >> Adjust control cable. Refer to "Adjustment of A/T Position".

4. 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 5.
NG >> GO TO 8.
5. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No.15).
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

6. CHECK SYMPTOM
Check again. Refer to "Cruise Test - Part 3".
OK or NG
OK >> INSPECTION END
NG >> GO TO 7.
7. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-84, "TCM Input/Output Signal Reference Values". Pinout Values and Diagnostic Parameters
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.
8. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to "Symptom Chart" (Symptom No. 15).
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.