Mitsubishi Pajero Pinin 1999 Workshop Manual page 321

AUTOMATIC TRANSMISSION ±
REFERENCE FOR FAIL-SAFE/BACKUP FUNCTIONS
When malfunctions of the main sensors or actuators are detected by the diagnosis system, the vehicle
is controlled by means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning item
Output shaft speed
sensor
Inhibitor switch
Accelerator pedal
position sensor
Solenoid valve No. 3
Solenoid valve No. 1,
No. 2
Selector le- Normal
ver
position
Gear
D 1
2
3
O/D
2 1
2
3
L 1
2
: Energized (ON)
×
: Not energized (OFF)
Control contents during malfunction
If there is an open circuit in the output shaft speed sensor, upshifting to 4th gear and lockup
control is stopped.
If there is an open circuit in the N, 2 or L signal line, driving is possible in the case of 2 and L
(same as D range) so that control can be performed as if the range is D range, and driving is
not possible in N range. If more than one of the N, 2 or L signals are input, the order of priority
→ →
for control is L 2 N.
If the output is 0.335 V or less or 4.8 V or more during idling condition, gear shifting control when
throttle is fully closed is carried out.
If a problem is detected, lockup is stopped over the whole range and the solenoid is turned off
to prevent the engine from stalling during idling.
If a problem is detected, each solenoid stops operating and is turned off. The gear shifting logic
when a problem is detected is given in the table below
When
valve No. 1 has broken
S1 S2 Gear
×
3
3
×
3
× ×
O/D
×
3
3
×
3
×
1
2
Troubleshooting <A/T>
the solenoid When
valve No. 2 has broken
S1 S2 Gear
×
→
1
O/D
O/D
×
O/D
×
→
1
3
3
×
1
1
the solenoid When
valves No. 1 and No. 2
have broken
S1 S2 Gear
O/D
×
→
O/D
×
O/D
×
O/D
3
×
→
3
×
3
1
1
23-29
the solenoid
S1 S2