Specifications
AUTOMATIC TRANSMISSION -
Troubleshooting
23-34
INSPECTION PROCEDURE 12
Some points (Displaced shifting points)
Probable cause
If some of the shift points are displaced while driving, the cause is probably a malfunction
of the valve body, or it is related to control and is not an abnormality.
D Malfunction of the valve body
L
: Refer to the Transmission Workshop Manual.
INVECS-
II
CANCEL COMMAND
D Use the MUT-II to stop t h e
INVECS-II function.
Does standard shifting occur normally?
No
Does the problem occur only when the
automatictransmissionfluidtemperature
is -29_C or lower or 125_C or higher?
No
Valve body disassembly, cleaning and
reassembly L
D Pay particular attention to loosening
of bolts, and to damage and slippage
of O-rings, valves and valve bodies.
D If the damage cannot be repaired,
replace the valve body assembly.
Yes
It is related to control and is not an ab-
normality.
Yes
INSPECTION PROCEDURE 13
No diagnosis codes (Does not shift)
Probable cause
If shifting does not occur while driving and no diagnosis codes are output, the cause
is probably a malfunction of the inhibitor switch, or A/T-ECU.
D Malfunction of the inhibitor switch
D Malfunction of the A/T-ECU
Does the transmission remain in 3rd
gear with selector lever in position
D?
No
MUT-
II
Data list
D No. 61 Inhibitor switch
OK:
A/T-ECU input signal and se-
lector lever position should
match.
NG
Inhibitor switch check
D INSPECTION PROCEDURE 16 -
Inhibitor switch system check.
(Refer to P.23-36.)
OK
Yes
Is backup power being supplied to the
A/T-ECU?
No
Yes
Is power being supplied to the
A/T-ECU?
Yes
No
Power supply circuit check
D Pay particular attention to open
circuits in the harnesses, poor
connector connections and open
circuits in fuses.
D If there is a blown fuse, investigate
why a short-circuit has occurred and
then replace the fuse.
OK
Replace the A/T-ECU.
MUT-
II
Data list
D No. 62 Hold mode signal
OK:
The signal should change
when the mode control switch
position is changed.
NG
Mode control switch check
D INSPECTION PROCEDURE 17 -
Mode control switch system check
(Refer to P.23-36.)