A/T Does Not Shift D3 To D4

TROUBLE DIAGNOSIS FOR SYMPTOMS


A/T Does Not Shift: D3 to D4


SYMPTOM:
- A/T does not shift from D3 to D4 at the specified speed on "Cruise Test -- Part 1" and "Cruise Test
-- Part 2".
- A/T must be warm before D3 to D4 shift will occur.

DIAGNOSTIC PROCEDURE
1.CHECK SYMPTOM
Check symptom. Automatic Transmission and Automatic Transmission .
Are "Vehicle Does Not Creep Forward in "D", "2" or "1" Position" and "Vehicle Cannot Be Started from D1" OK?
YES - GO TO 2.
NO - Go to D", "2" or "1" Position" and .
2.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Automatic Transmission or Automatic Transmission .
Is any malfunction detected by self-diagnostic results?
YES - Check the malfunctioning system. Automatic Transmission or Automatic Transmission .
NO - GO TO 3.
3.CHECK ACCELERATOR PEDAL POSITION SENSOR
Check accelerator pedal position sensor. P2138 (HR16DE), P2138 (MR18DE).
OK or NG
OK - GO TO 4.
NG - Repair or replace accelerator pedal position sensor.
4.CHECK A/T FLUID CONDITION
1. Remove oil pan. Component .
2. Check A/T fluid condition. Automatic Transmission .
OK or NG
OK - GO TO 6.
NG - GO TO 5.
5.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Service and Repair .
2. Check the following items:
- Shift valve A
- Overrun clutch control valve
- Shift solenoid valve A
- Overrun clutch solenoid valve
- Pilot valve
- Pilot filter
3. Disassemble A/T. Disassembly .
4. Check the following items:
- Servo piston assembly
- Brake band
- Torque converter. Disassembly .
- Oil pump assembly. Oil Pump .
OK or NG
OK - GO TO 7.
NG - Repair or replace damaged parts.
6.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Service and Repair .
2. Check the following items:
- Shift valve A
- Overrun clutch control valve
- Shift solenoid valve A
- Pilot valve
- Pilot filter
OK or NG
OK - GO TO 7.
NG - Repair or replace damaged parts.
7.CHECK SYMPTOM
Check again. Automatic Transmission and Automatic Transmission .
OK or NG
OK - INSPECTION END
NG - GO TO 8.
8.CHECK TCM
1. Check TCM input/output signals. Automatic Transmission .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.