Mitsubishi Montero Sport (2004+). Manual — part 683
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-297
DTC 41 (P0731): 1st Gear Incorrect Ratio
DTC 42 (P0732): 2nd Gear Incorrect Ratio
DTC 43 (P0733): 3rd Gear Incorrect Ratio
DTC 44 (P0734): 4th Gear Incorrect Ratio
DTC 46 (P0736): Reverse Gear Incorrect Ratio
.
CIRCUIT OPERATION
• The input shaft speed sensor generates a pulsed
signal of 0
⇔ 5 volts. The pulsed signal fre-
quency increases with an increase in the input
shaft speed.
• The PCM (terminal 103) continuously monitors
the input shaft speed signal.
• The output shaft speed sensor generates a
pulsed signal of 0
⇔ 5 volts. The pulsed signal
frequency increases with an increase in the out-
put shaft speed.
• The PCM (terminal 104) continuously monitors
the output shaft speed signal.
.
DESCRIPTIONS OF MONITOR METHODS <DTC
41 (P0731)>
In 1st gear, if a difference between turbine revolution
and that value calculated from output revolution
equals or exceeds specified value, PCM judges that
step-out in 1st gear has occurred.
.
MONITOR EXECUTION <DTC 41 (P0731)>
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor) <DTC 41 (P0731)>
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• DTC 27, 28 (P0705): Transmission range switch
malfunction
• DTC 22 (P0715): Input shaft speed sensor mal-
function
• DTC 23 (P0720): Output shaft speed sensor mal-
function
• DTC 36 (P0743): Torque converter clutch sole-
noid malfunction
• DTC 31 (P0753): Low-reverse solenoid malfunc-
tion
• DTC 32 (P0758): Underdrive solenoid malfunc-
tion
• DTC 33 (P0763): Second solenoid malfunction
• DTC 34 (P0768): Overdrive solenoid malfunction
• DTC 54 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be
normal)
• Input shaft speed sensor
• Output shaft speed sensor
• Transmission range switch
• Torque converter clutch solenoid
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
• A/T control relay
.
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-298
LOGIC FLOW CHARTS (Monitor Sequence) <DTC 41 (P0731)>
.
Yes
No
No
N
E
:
Engine speed
START
Yes
No
Transmission fluid temperature
sensor voltage < 4.5 V
There is only one transmission
range switch signal
Yes
N
E
> 450 r/min
N
OPG-B
> 350 r/min
N
IPG-A
> 0 r/min
Continuous failure for 4 secs.
Good
END
N
OPG-B
: Output speed
(output shaft speed sensor)
No
Yes
No
No
Yes
N
IPG-A
< I
1
× N
OPG-B
- 200
No
Yes
Yes
Malfunction
Shift change is finished
N
IPG-A
: Input speed
(input shaft speed sensor)
I
1
: 1st g
ear ratio
AC205243
Timer start
Timer > 2 secs.
Voltage of battery > 10 V
Shift stage commanded
by A/T ECM is 1st
No
Yes
Yes
No
AB
Shift stage commanded
by PCM is 1st
+
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-299
DTC SET CONDITIONS <DTC 41 (P0731)>
Check Conditions
• Engine speed: 450 r/min or more.
• Output speed: 350 r/min or more.
• Shift stage: 1st gear.
• Input speed: more than 0 r/min.
• Transmission fluid temperature sensor voltage:
4.5 volts or less.
• Voltage of battery: 10 volts or more.
• Transmission range switch rationality: only one
signal.
• Time after shift changing finish: 2 seconds or
more.
Judgement Criteria
• Output speed: [(input speed - 200 r/min) / 1st
gear ratio] or less. (4 seconds)
• If DTC 41 (P0731) is set consecutively four times,
the transmission is locked into 3rd gear as a
fail-safe measure, and the "N" range light flashes
once per second.
.
OBD-II DRIVE CYCLE PATTERN <DTC 41
(P0731)>
Start the engine, and drive at 20 km/h (12 mph) or
more for 10 seconds, with 1st gear fixed (L range).
.
DESCRIPTIONS OF MONITOR METHODS <DTC
42 (P0732)>
In 2nd gear, if a difference between turbine revolution
and that value calculated from output revolution
equals or exceeds specified value, PCM judges that
step-out in 2nd gear has occurred.
.
MONITOR EXECUTION <DTC 42 (P0732)>
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor) <DTC 42 (P0732)>
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• DTC 27, 28 (P0705): Transmission range switch
malfunction
• DTC 22 (P0715): Input shaft speed sensor mal-
function
• DTC 23 (P0720): Output shaft speed sensor mal-
function
• DTC 36 (P0743): Torque converter clutch sole-
noid malfunction
• DTC 31 (P0753): Low-reverse solenoid malfunc-
tion
• DTC 32 (P0758): Underdrive solenoid malfunc-
tion
• DTC 33 (P0763): Second solenoid malfunction
• DTC 34 (P0768): Overdrive solenoid malfunction
• DTC 54 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be
normal)
• Input shaft speed sensor
• Output shaft speed sensor
• Transmission range switch
• Torque converter clutch solenoid
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
• A/T control relay
.
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-300
LOGIC FLOW CHARTS (Monitor Sequence) <DTC 42 (P0732)>
.
Yes
No
No
N
E
:
Engine speed
START
Yes
No
Transmission fluid temperature
sensor voltage < 4.5 V
There is only one transmission
range switch signal
Yes
N
E
> 450 r/min
N
OPG-B
> 500 r/min
N
IPG-A
> 0 r/min
Continuous failure for 4 secs.
Good
END
N
OPG-B
: Output speed
(output shaft speed sensor)
No
Yes
No
No
Yes
No
Yes
Yes
Malfunction
Shift change is finished
N
IPG-A
: Input speed
(input shaft speed sensor)
I
2
: 2nd g
ear ratio
AC205244
Timer start
Timer > 2 secs.
Voltage of battery > 10 V
Shift stage commanded
by A/T ECM is 2nd
No
Yes
Yes
No
I
2
× N
OPG-B
- 200 < N
IPG-A
< I
2
× N
OPG-B
+ 200
AB
Shift stage commanded
by PCM is 2nd
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