A/T Does Not Shift 2 To 1
TROUBLE DIAGNOSIS FOR SYMPTOMS
A/T Does Not Shift: 2 1, When Selector Lever "2" --> "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
1.Turn ignition switch ON. (Do not start engine.)
2.Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
3.Read out "PN", "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
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. Refer to {LINK_TO_MANY:0000000007329322}{LINK_TO_MANY:0000000007329323}{LINK_TO_MANY:0000000007329324}{LINK_TO_MANY:0000000007329325}{LINK_TO_MANY:0000000007329326} and/or {LINK_TO_MANY:0000000007329403}{LINK_TO_MANY:0000000007329404}{LINK_TO_MANY:0000000007329405}{LINK_TO_MANY:0000000007329406}{LINK_TO_MANY:0000000007329407} .
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.