A/T Does Not Shift 2 To 1, When Selector Lever "2" To "1" Position

TROUBLE DIAGNOSIS FOR SYMPTOMS


A/T Does Not Shift: 22 to 11, When Selector Lever "2" to "1" Position


SYMPTOM:
A/T does not shift from 22 to 11 when changing selector lever from "2" to "1" position on "Cruise Test
-- Part 3".

DIAGNOSTIC PROCEDURE
1.CHECK TRANSMISSION RANGE SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out "P-N", "R", "D", "2" and "1" position switches moving selector lever to each position.





OK or NG
OK - GO TO 3
NG - Check transmission range switch. TR Sw, OD Sw And Closed Throttle, Wide Open Throttle Position Signal Circuit .
2.CHECK TRANSMISSION RANGE SWITCH CIRCUIT
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)





2. Check voltage between TCM connector terminals and ground while moving selector lever through each position. Transmission Range Switch A .





OK or NG
OK - GO TO 3
NG - Check transmission range switch. TR Sw, OD Sw And Closed Throttle, Wide Open Throttle Position Signal Circuit .
3.CHECK A/T POSITION
Check A/T position. Testing and Inspection .
OK or NG
OK - GO TO 4.
NG - Adjust A/T position. Adjustments .
4.CHECK OUTPUT SPEED SENSOR AND VEHICLE SPEED SIGNAL CIRCUIT
Check output speed sensor and vehicle speed signal circuit. Output Speed Sensor and/or Vehicle Speed Signal.
OK or NG
OK - GO TO 5.
NG - Repair or replace output speed sensor and/or vehicle speed signal circuits.
5.CHECK A/T FLUID CONDITION
1. Remove oil pan. Component .
2. Check A/T fluid condition. Automatic Transmission .
OK or NG
OK - GO TO 7.
NG - GO TO 6.
6.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Service and Repair .
2. Check the following items:
- Shift valve A
- Shift solenoid valve A
- Overrun clutch control valve
- Overrun clutch solenoid valve
3. Disassemble A/T. Disassembly .
4. Check the following items:
- Servo piston assembly
- Brake band
OK or NG
OK - GO TO 7.
NG - Repair or replace damaged parts.
7.CHECK SYMPTOM





Check again. 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.