AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>
23-19
INSPECTION PROCEDURE 5
Upshifting does not occur
Probable cause
Upshifting does not occur under conditions when upshifting should occur. Check
shifting from 1→2, 2→3 and 3→4 respectively.
D Malfunction of solenoid valve No. 1, No. 2
D Malfunction of A/T-ECU
D Malfunction of power train internal parts
L: Refer to the Transmission Workshop Manual.
Is a normal diagnostic code output?
No
To Inspection Chart For Each Diagnosis
Code (Refer to P. 23-9.)
Yes
Does not the A/T shift from 1→2?
No
Does the A/T shift to 2nd gear in 2
range?
No
Malfunction of 1-2 shift valve. L
Malfunction of solenoid valve No.
2.L
Yes
Yes
Check the brake No. 2 system. L
Check one-way clutch No. 1.L
Does not the A/T shift from 2→3?
No
Does the vehicle reverse in R range?
No
Check the direct clutch system.
L
Yes
Yes
Malfunction of 2-3 shift valve.L
Malfunction of solenoid valve No. 1.L
A/T does not shift from 3→4. Does the vehicle move in 1st gear in
D range?
No
Malfunction of solenoid valve No.
2. L
Yes
Inspection Procedure 15 ± Overdrive
Switch System (Refer to P. 23-25.)
NG
Repair
OK
Malfunction of 3-4 shift valve. L Check the trouble symptoms.
NG
Replace the A/T-ECU.
To Next Page
Loading...
