Mitsubishi Space Star. Manual - part 115
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-27
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.
Malfunction of the valve body
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
: Refer to the Transmission Workshop Manual.
INVECS-
II
CANCEL COMMAND
Use the MUT-
II
to stop the
INVECS-
II
function.
Does standard shifting occur normally?
NO
Does the problem occur only when the
automatic transmission fluid
temperature is –29
C or lower or 125
C
or higher?
NO
Valve body disassembly, cleaning and
reassembly
Pay particular attention to loosening
of bolts, and to damage and
slippage of O-rings, valves and
valve bodies.
If the damage cannot be repaired,
replace the valve body assembly.
YES
It is related to control and is not an
abnormality.
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 engine-A/T-ECU.
Malfunction of the inhibitor switch
Malfunction of the shift switchassembly
Malfunction of the engine-A/T-ECU
INSPECTION PROCEDURE 17 - Shift
switch assembly system check (Refer
to P.23-29.)
Replace the engine-A/T-ECU.
NG
OK
YES
NO
Power supply circuit check
Pay particular attention to open
circuits in the harnesses, poor
connector connections and open
circuits in fuses.
If there is a blown fuse, investigate
why a short-circuis has occurred
and then replace the fuse.
Does the transmission remain in 3rd
gear with selector lever in position D?
NO
MUT-
II
Data list
No. 61 Inhibitor switch
OK: Engine-A/T-ECU input signal
and selector lever position
should match.
NG
Inhibitor switch check
INSPECTION PROCEDURE 16 -
Inhibitor switch system check.
(Refer to P.23-29.)
Is backup power being supplied to the
engine-A/T-ECU?
YES
Is power being supplied to the en-
gine-A/T-ECU?
YES
MUT-
II
Data list
No. 67 Select switch
No. 68 Upshift switch
No. 69 Downshift switch
OK: Engine-A/T-ECU input signal
and selector lever operation
should match.
YES
OK