2000 MITSUBISHI MONTERO Service Repair Manual

AUTOMATIC TRANSMISSION -Troubleshooting 23-36
Code No.43 3rd without completion of shiftingProbable cause
If the output shaft speed sensor output multiplied by the 3rd gear ratio is not
identical to the input shaft speed sensor output after shifting to 3rd, code No. 43
is output.
If code No. 43 is output 4 times, the transmission is fixed in 3rd and the N
range lampflashes at a rate of 1 Hz.DMalfunction of input shaft speed sensor
DMalfunction of output shaft speed sensor
DMalfunction of harness or connector
DMalfunction of solenoid valve
DMalfunction of reverse clutch retainer
DMalfunction of direct planetary carrier
DMalfunction of UD clutch system
DMalfunction of OD clutch system
DMalfunction of RED brake system
DMalfunction of one-way clutch system
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DNoise is generated.
LRefer to the Transmission Workshop Manual.
Repair
NO
YES
YES
MUT-
IISelf-Diag Code
DIs code No. 22 output?Code No. 22 Input shaft speed sensor system check
(Refer to P.23-20.)
OK NO
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-22.)MUT-
IIActuator Test
DIs code No. 23 output?
NG
NGMUT-
IIActuator Test
DNo.1 LR solenoid valve
DNo.2 UD solenoid valve
DNo.3 2ND solenoid valve
DNo.4 OD solenoid valve
DNo.5 RED solenoid valve
OK:The sound of operation should be heard.Replace the appropriate solenoid valve.
L
DCheck the harness between the input shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the input shaft speed sensor
and the A/T-ECU.<4M4>
Replace the input shaft speed sensor.
LNG
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the reverse clutch retainer.
Check the trouble symptoms.
Eliminate the cause of the noise.To the nextpage
Measure the output wave pattern of the input shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.103 (D-122)
<4M4> Voltage between No.31(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OKNG
NG OK


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-37
NG
Replace the valve body assembly.
L
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Check the trouble symptoms.
Repair
OK
NGDCheck the harness between the output shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the output shaft speed sensor
and the A/T-ECU.<4M4>
Replace the output shaft speed sensor.
L OK
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the direct planetary carrier.
Check the trouble symptoms.
Eliminate the cause of the noise.
To the nextpage
Measure the output wave pattern of the output shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7>Voltage between No.81 (D-121) and No.104 (D-122)
<4M4> Voltage between No.32(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and with the maximum value should be 4.8 V or
more and the minimumvalue should be 0.8 V or less.
There should be no noise in the output wave pattern.
OK
NG
Overhaul the A/T.
L
DReplace the UD clutch. (Code No. 41, 42 or No. 44 is
output, or no other codes are output.)
DReplace the OD clutch. (Code No. 44 or No. 45 is output,
or no other codes are output.)
DReplace the RED brake. (Code No. 41, 42 or No. 46 is
output, or no other codes are output.)
DReplace the one-way clutch (OWC-D). (Code No. 41 or
No. 42 is output, or no other codes are output.)NG
NG NG


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-38
Code No.44 4th without completion of shiftingProbable cause
If the output shaft speed sensor output multiplied by the 4th gear ratio is not
identical to the input shaft speed sensor output after shifting to 4th, code No. 44
is output.
If code No. 44 is output 4 times, the transmission is fixed in 3rd and the N
range lampflashes at a rate of 1 Hz.DMalfunction of input shaft speed sensor
DMalfunction of output shaft speed sensor
DMalfunction of harness or connector
DMalfunction of solenoid valve
DMalfunction of reverse clutch retainer
DMalfunction of direct planetary carrier
DMalfunction of UD clutch system
DMalfunction of 2ND brake system
DMalfunction of OD clutch system
DMalfunction of DIR clutch system
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DNoise is generated.
LRefer to the Transmission Workshop Manual.
Repair
NO
YES
YES
MUT-
IISelf-Diag Code
DIs code No. 22 output?Code No. 22 Input shaft speed sensor system check
(Refer to P.23-20.)
OK NO
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-22.)MUT-
IIActuator Test
DIs code No. 23 output?
NG
NGMUT-
IIActuator Test
DNo.1 LR solenoid valve
DNo.2 UD solenoid valve
DNo.3 2ND solenoid valve
DNo.4 OD solenoid valve
DNo.5 RED solenoid valve
OK:The sound of operation should be heard.Replace the appropriate solenoid valve.
L
DCheck the harness between the input shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the input shaft speed sensor
and the A/T-ECU.<4M4>
Replace the input shaft speed sensor.
LNG
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the reverse clutch retainer.
Check the trouble symptoms.
Eliminate the cause of the noise.To the nextpage
Measure the output wave pattern of the input shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.103 (D-122)
<4M4> Voltage between No.31(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OKOK
NG
NG


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-39
NG
Replace the valve body assembly.
L
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Check the trouble symptoms.
Repair
OK
NGDCheck the harness between the output shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the output shaft speed sensor
and the A/T-ECU.<4M4>
Replace the output shaft speed sensor.
L OK
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the direct planetary carrier.
Check the trouble symptoms.
Eliminate the cause of the noise.
From the previouspage
Measure the output wave pattern of the output shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.104 (D-122)
<4M4> Voltage between No.32(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OK
NG
Overhaul the A/T.
L
DReplace the UD clutch. (Code No. 41, 42 or No. 43 is
output, or no other codes are output.)
DReplace the OD clutch. (Code No. 43 or No. 45 is output,
or no other codes are output.)
DReplace the DIR clutch. (Code No. 45 is output, or no
other codes are output.)NG
NG NG


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-40
Code No.45 5th without completion of shiftingProbable cause
If the output shaft speed sensor output multiplied by the 5th gear ratio is not
identical to the input shaft speed sensor output after shifting to 5th, code No. 45
is output.
If code No. 45 is output 4 times, the transmission is fixed in 3rd and the N
range lampflashes at a rate of 1 Hz.DMalfunction of input shaft speed sensor
DMalfunction of output shaft speed sensor
DMalfunction of harness or connector
DMalfunction of solenoid valve
DMalfunction of reverse clutch retainer
DMalfunction of direct planetary carrier
DMalfunction of 2ND brake system
DMalfunction of OD clutch system
DMalfunction of DIR clutch system
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU.<4M4>
DNoise is generated.
LRefer to the Transmission Workshop Manual.
Repair
NO
YES
YES
MUT-
IISelf-Diag Code
DIs code No. 22 output?Code No. 22 Input shaft speed sensor system check
(Refer to P.23-20.)
OK NO
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-22.)MUT-
IIActuator Test
DIs code No. 23 output?
NG
NGMUT-
IIActuator Test
DNo.1 LR solenoid valve
DNo.2 UD solenoid valve
DNo.3 2ND solenoid valve
DNo.4 OD solenoid valve
DNo.5 RED solenoid valve
OK:The sound of operation should be heard.Replace the appropriate solenoid valve.
L
DCheck the harness between the input shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the input shaft speed sensor
and the A/T-ECU.<4M4>
Replace the input shaft speed sensor.
LNG
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the reverse clutch retainer.
Check the trouble symptoms.
Eliminate the cause of the noise.To the nextpage
Measure the output wave pattern of the input shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.103 (D-122)
<4M4> Voltage between No.31(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OKNG
NG OK


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-41
NG
Replace the valve body assembly.
L
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Check the trouble symptoms.
Repair
OK
NGDCheck the harness between the output shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the output shaft speed sensor
and the A/T-ECU.<4M4>
Replace the output shaft speed sensor.
L OK
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the direct planetary carrier.
Check the trouble symptoms.
Eliminate the cause of the noise.
From the previouspage
Measure the output wave pattern of the output shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.104 (D-122)
<4M4> Voltage between No.32(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OK
NG
Overhaul the A/T.
L
DReplace the OD clutch. (Code No. 43 or No. 44 is output,
or no other codes are output.)
DReplace the 2ND brake. (Code No. 42 is output, or no
other codes are output.)
DReplace the DIR clutch. (Code No. 44 is output, or no
other codes are output.)NG
NG NG


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-42
Code No. 46 Reverse without completion of shiftingProbable cause
If the output shaft speed sensor output multiplied by the reverse gear ratio is not
identical to the input shaft speed sensor output after shifting to reverse, code
No. 46 is output.
If code No. 46 is output 4 times, the transmission is fixed in 3rd and the N
range lampflashes at a rate of 1 Hz.DMalfunction of input shaft speed sensor
DMalfunction of output shaft speed sensor
DMalfunction of harness or connector
DMalfunction of solenoid valve
DMalfunction of reverse clutch retainer
DMalfunction of direct planetary carrier
DMalfunction of LR brake system
DMalfunction of REV clutch system
DMalfunction of RED clutch system
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DNoise is generated.
LRefer to the Transmission Workshop Manual.
Repair
NO
YES
YES
MUT-
IISelf-Diag Code
DIs code No. 22 output?Code No. 22 Input shaft speed sensor system check
(Refer to P.23-20.)
OK NO
Code No. 23 Output shaft speed sensor system check
(Refer to P.23-22.)MUT-
IIActuator Test
DIs code No. 23 output?
NG
NGMUT-
IIActuator Test
DNo.1 LR solenoid valve
DNo.2 UD solenoid valve
DNo.3 2ND solenoid valve
DNo.4 OD solenoid valve
DNo.5 RED solenoid valve
OK:The sound of operation should be heard.Replace the appropriate solenoid valve.
L
DCheck the harness between the input shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the input shaft speed sensor
and the A/T-ECU.<4M4>
Replace the input shaft speed sensor.
LNG
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the reverse clutch retainer.
Check the trouble symptoms.
Eliminate the cause of the noise.To the nextpage
Measure the output wave pattern of the input shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.103 (D-122)
<4M4> Voltage between No.31(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OKOK
NG
NG


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-43
NG
Replace the valve body assembly.
L
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Check the trouble symptoms.
Repair
OK
NGDCheck the harness between the output shaft speed sensor
and the engine-A/T-ECU. <6G7>
DCheck the harness between the output shaft speed sensor
and the A/T-ECU.<4M4>
Replace the output shaft speed sensor.
L OK
Check the trouble symptoms.
Overhaul the A/T.
L
DReplace the reverse clutch.
Check the trouble symptoms.
Eliminate the cause of the noise.
From the previouspage
Measure the output wave pattern of the output shaft speed
sensor at engine-A/T-ECU connectors D-121 and D-122
<6G7>, or at A/T-ECU connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between No.81 (D-121) and No.104 (D-122)
<4M4> Voltage between No.32(D-108) and No.43 (D-108)
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope) should be
output, and the maximum value should be 4.8 V or more
and the minimumvalue should be 0.8 V or less. There
should be no noise in the output wave pattern.
OK
NG
Overhaul the A/T.
L
DReplace the LR brake. (Code No. 41 is output, or no other
codes are output.)
DReplace the REV clutch. (No other codes are output.)
Replace the RED brake. (Code No. 41, 42 or No. 43 is
output, or no other codes are output.)NG
NG NG
Code No. 51 Communication problem with engine-ECUProbable cause
If normal communication cannot be carried outsuccessfully for 1 second or
more when the ignition switch is at the ON position, the system voltage is 10 V
or higher and the enginespeed is 450 r/min or higher, code No. 51 is output.
Furthermore, code No. 51 is also output if a communication problem with
receiving data continues for 4 seconds or more under the same conditions.DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of engine-ECU <4M4>
DMalfunction of A/T-ECU<4M4>
DMalfunction of harness or connector<4M4>
Check the following connectors:D-112, D-109NG
Repair
OK
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.Check the trouble symptoms.NG
<4M4>
<6G7>
Check the harness between the engine-ECU and the
A/T-ECU.
Malfunction of A/T-ECU
Malfunction of engine-A/T-ECU


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk