A/T Does Not Shift- 22 To 11, 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 PNP 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 PNP switch. Refer to Component Inspection .
2.CHECK PNP 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. Refer to Automatic Transmission .










OK or NG
OK >> GO TO 3
NG >> Check PNP switch. Refer to Component Inspection .
3.CHECK A/T POSITION
Check A/T position. Refer to Testing and Inspection .
OK or NG
OK >> GO TO 4.
NG >> Adjust A/T position. Refer to Adjustments .
4.CHECK VEHICLE SPEED SENSOR�A/T AND VEHICLE SPEED SENSOR�MTR CIRCUIT
Check vehicle speed sensor�A/T (revolution sensor) and vehicle speed sensor�MTR circuit. Refer to Automatic Transmission and/or Description CONSULT-III Reference Value In Data Monitor Mode On Board Diagnosis Logic Possible Cause DTC Confirmation Procedure .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace vehicle speed sensor�A/T (revolution sensor) and/or vehicle speed sensor�MTR circuits.
5.CHECK A/T FLUID CONDITION
1. Remove oil pan. Refer to Component .
2. Check A/T fluid condition. Refer to Inspections Before Trouble Diagnosis .
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to 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. Refer to 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. 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 Pinout Values and Diagnostic Parameters .
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.