MITSUBISHI MONTERO 2000 Service Repair Manual

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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-12
CHART CLASSIFIED BY DIAGNOSIS CODE
Diagnosis
codeDiagnosis itemReference page
11Accelerator pedal position sensor (APS) systemShort-circuit23-13
12Open circuit23-14
14Incorrect sensor
adjustment23-15
15A/T fluid temperature sensor systemOpen circuit23-17
21Crank angle sensor system <6G7> or engine speed sensor
system <4M4>Open circuit23-18
22Input shaft speed sensor systemShort-circuit/Open
circuit23-20
23Output shaft speed sensor systemShort-circuit/Open
circuit23-22
25Wide open throttle switch systemShort-circuit/Open
circuit23-24
26Stop lamp switch systemShort-circuit23-25
31LR solenoid valve systemShort-circuit/Open
circuit23-26
32UD solenoid valve systemShort-circuit/Open
circuit23-27
332nd solenoid valve systemShort-circuit/Open
circuit23-28
34OD solenoid valve systemShort-circuit/Open
circuit23-29
35RED solenoid valve systemShort-circuit/Open
circuit23-30
36DCC solenoid valve systemShort-circuit/Open
circuit23-31
411st without completion of shifting23-32
422nd without completion of shifting23-34
433rd without completion of shifting23-36
444th without completion of shifting23-38
455th without completion of shifting23-40
46Reverse without completion of shifting23-42
51Problem communicating with engine-ECU23-43
52Damper clutch control systemSystem malfunc-
tion23-44
54A/T control relay systemShort-circuit to
earth/Open circuit23-45
56N range lamp systemShort-circuit to
earth23-46


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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-13
INSPECTION PROCEDURES CLASSIFIED BY DIAGNOSIS CODE
Code No. 11 Accelerator pedal position sensor (APS)
short-circuit systemProbable cause
If the APS output during idling is 4.8 V or higher, it is judged that there is
excessiveoutput, and code No. 11 is output.DMalfunction of APS
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DMalfunction of engine-ECU <4M4>
NG
NG
NG
NG Replace
(1)NGNG
Repair
APS single part check
(Refer to GROUP 13 - On-vehicle
Service.)
Check the following connector:D-135
MUT-
IIData List
DNo.11 APS
OK:Refer to P.23-61 (Data List
Chart).
Repair
Check the following connectors:
<6G7> D-120,<4M4> D-112
Repair Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.) OK
Measure at APS connector D-135
DDisconnect the connector and
measure at the harness side.
(1) <6G7> Resistance between
terminal 1 and earth
<4M4>Resistance between
terminal 7 and earth
OK:2
Wor less
(2) <6G7> Voltage between terminal
2 and earth
<4M4> Voltage between terminal
8 and earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
DCheck the harness between the
APS and the engine-A/T-ECU.
<6G7>
DCheck the harness between the
APS and the engine-ECU. <4M4>
OK
OK
Replace the engine-A/T-ECU or
engine-ECU.
(2)NG
OK
OKCheck the following connectors:
<6G7> D-121,<4M4>D-108
Check the trouble symptoms.OK
APS adjustment
(Refer to GROUP 13 - On-vehicle
Service.)
Check the following connectors:
<6G7> D-121,<4M4>D-108 NG
OK
Replace the engine-A/T-ECU or
A/T-ECU. OK OK OKNG
NGRepair Repair
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4> NG NG
NGCheck the trouble symptoms.
Measure at engine-A/T-ECU
connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal
95 and earth
D<4M4> Voltage between terminal
45 and earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the A/T-ECU, and
repair if necessary. <6G7>
NG
Check the following connectors:
<6G7> D-120,<4M4> D-112


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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-14
Code No. 12 Accelerator pedal position sensor (APS)
open circuit systemProbable cause
When the APS output is 0.2 V or less while theengine is idling, it is judged that
output is too low and code No. 12 is output.DMalfunction of APS
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DMalfunction of engine-ECU <4M4>
NG
NG
NG Replace
NG
NG
Repair
APS single part check (Refer to
GROUP 13 - On-vehicle Service.)
Check the following connectors:
D-135
MUT-
IIData List
DNo.11 APS
OK:Refer to P.23-61 (Data List
Chart).
RepairTransient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.) OK
Measure at APS connector D-135
DDisconnect the connector and
measure at the harness side.
D<6G7>Voltage between terminal
2 and earth
D<4M4>Voltage between terminal
8 and earth
OK:4.8 - 5.2 V
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4> OK
Check the following connectors:
<6G7> D-120,<4M4> D-112
OK
Measure at APS connector D-135.
DUse the test harness
(MB991658) to connect only
terminals 1, 2 and 3 <6G7>, or
only terminals 6, 7 and 8 <4M4>,
and then measure at the pickup
harness.
DIgnition switch: ON
(1) <6G7> Voltage between terminal
2 and earth
<4M4> Voltage between terminal
8 and earth
OK:4.8 - 5.2 V
(2) <6G7> Voltage between terminal
3 and earth
<4M4> Voltage between terminal
6 and earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
(1)NGCheck the following connectors:
<6G7> D-120,<4M4> D-112 OK OK NG
Repair
Measure at engine-A/T-ECU
connector D-120 <6G7>, or at
engine-ECU connector D-112 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal
46 and earth
D<4M4> Voltage between terminal
60 and earth
OK:4.8 - 5.2 VOK
Repair
RepairCheck the following connectors:
<6G7> D-120,<4M4> D-112
NG
Check the trouble symptoms.OKReplace the engine-A/T-ECU or
engine-ECU.
OK
APS adjustment (Refer to GROUP
13 - On-vehicle Service.)
Check the following connectors:
<6G7> D-121,<4M4>D-108OK (2)NG
OK
Repair OK
NG
NG NG
NG
To the nextpage
DCheck the harness between the
APS and the engine-A/T-ECU.
<6G7>
DCheck the harness between the
APS and the engine-ECU. <4M4>
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4>
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4>


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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>AUTOMATIC TRANSMISSION -Troubleshooting <A/T>AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-15
OK
OK
From the previouspage
OK
Replace the engine-A/T-ECU or
A/T-ECU. OK
Measure at engine-A/T-ECU
connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal
95 and earth
D<4M4> Voltage between terminal
45 and earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or moreNG
NG
NG
Repair
Check the following connectors:
<6G7> D-121,<4M4>D-108
NG
Repair
Check the trouble symptoms.
Check the following connectors:
<6G7> D-121,<4M4>D-108
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the A/T-ECU, and
repair if necessary.<4M4>
Code No. 14 Accelerator pedal position sensor (APS)
incorrect adjustment systemProbable cause
If the APS output is 0.2 V or less or 1.2 V or higher while theengine is idling,
it is judged that the APS isincorrectly adjusted, and code No. 14 is output.DMalfunction of APS
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DMalfunction of engine-ECU <4M4>
NGNO
YES
YES
MUT-
IISelf-Diag Code
DIs code No. 11 output?Code No. 11 Acceleratorpedal
position sensor (APS) short-circuit
system check (Refer to P.23-13.)
Code No. 12 Acceleratorpedal
position sensor (APS) short-circuit
system check (Refer to P.23-14.)
MUT-
IIData List
DNo.11 APS
OK:Refer to P.23-61 (Data List
Chart).
NG
ReplaceAPS single part check
(Refer to GROUP 13 - On-vehicle
Service.)
OK
NG
Repair
OK
Check the following connector:
D-135OK NO
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.)
MUT-
IISelf-Diag Code
DIs code No. 12 output?
To the nextpage


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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-16
NG
OK
Check the following connectors:
<6G7> D-120,<4M4> D-112
Repair
NG
Repair
NG
Repair
OK
OK
Check the following connectors:
<6G7> D-120,<4M4> D-112
engine-A/T-ECU connector D-120
<6G7>
Measure at engine-ECU connector
D-112 <4M4>
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal
46 and earth
D<4M4> Voltage between terminal
6 and earth
OK:4.8 - 5.2 V
NGNG
NGCheck the trouble symptoms.Replace the engine-A/T-ECU or
engine-ECU.
OK
Measure at APS connector D-135
DDisconnect the connector and
measure at the harness side.
D<6G7>Voltage between terminals
2 and earth
D<4M4>Voltage between terminals
8 and earth
(Ignition switch: ON)
OK:4.8 - 5.2 VOK
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4>
DCheck the harness between the
APS and the engine-A/T-ECU.
<6G7>
DCheck the harness between the
APS and the engine-ECU. <4M4>
From the previouspage
OK
NG
NG
(1)NGCheck the following connectors:
<6G7> D-120,<4M4> D-112
(2)NG
Measure at engine-A/T-ECU
connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals.
DIgnition switch: ON
D<6G7> Voltage between terminal
95 and earth
D<4M4> Voltage between terminal
45 and earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
OKCheck the following connectors:
<6G7> C-121,<4M4>C-108
Check the trouble symptoms.OK
Check the following connectors:
<6G7> D-121,<4M4>D-108 NGOK
Replace the engine-A/T-ECU or
A/T-ECU. OK
NG
(3)NG
OK
APS adjustment
(Refer to GROUP 13 - On-vehicle
Service.)
NG
Check the following connectors:
<6G7> D-121,<4M4>D-108
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4>
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the A/T-ECU, and
repair if necessary.<4M4>
DCheck the harness between the
APS and the engine-A/T-ECU,
and repair if necessary. <6G7>
DCheck the harness between the
APS and the A/T-ECU, and
repair if necessary.<4M4> NG
Measure at APS connector D-135.
DUse the test harness
(MB991658) to connect only
terminals 1, 2 and 3 <6G7>, or
only terminals 6, 7 and 8 <4M4>,
and then measure at the pickup
harness.
DIgnition switch: ON
(1) <6G7> Voltage between terminal
1 and earth
<4M4> Voltage between terminal
7 and earth
OK:0.5 V or less
(2) <6G7> Voltage between terminal
2 and earth
<4M4> Voltage between terminal
8 and earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
(3) <6G7> Voltage between terminal
3 and earth
<4M4> Voltage between terminal
6 and earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or moreRepair
Repair
RepairOK
Repair


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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-17
Code No. 15 A/T fluid temperature sensor systemProbable cause
If the A/T fluid temperature sensor output is 4.5 V or higher even after driving
for 10 minutes or more (fluid temperature does not rise), it isjudged that there
is an opencircuit in the A/T fluid temperature sensor and code No. 15 is output.DMalfunction of A/T fluid temperature sensor
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NG
Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.)
Check the following connectors:<6G7> D-121,<4M4>D-108
OK
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
OKRepair NG
NG
To the nextpage
OK
NG
NG
OK
Measure at engine-A/T-ECU connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal 81 and earth
D<4M4> Voltage between terminal 43 and earth
OK:0.5 V or less
NG OK
Check the following connectors:<6G7> D-122,<4M4>D-108
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
OK
NGReplace the A/T fluid temperature sensor.
L
Measure at engine-A/T-ECU connector D-122 <6G7>, or at
A/T-ECU connector D-108 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal 124 and earth
D<4M4> Voltage between terminal 44 and earth
OK:A/T fluid temperature
3.8 - 4.0 V at 20
_C
3.2 - 3.4 V at 40
_C
1.7 - 1.9 V at 80
_COK
MUT-
IIData List
DNo.15 A/T fluid temperature sensor
OK:When the engine iscold, the temperature is about
the same as the atmospheric temperature (air tem-
perature).
When the engine is hot, the temperature is 70 -
80
_C.
NG
Repair
NG
Revision
Measure at solenoid valve assembly connector C-04.
DDisconnect the connector and measure at the sensor side.
DResistance between terminals 1 and 2
OK:A/T fluid temperature
16.7 - 20.5 k
Wat 0
_C
7.3 - 8.9 k
Wat 20
_C
3.4 - 4.2 k
Wat 40
_C
1.9 - 2.2 k
Wat 60
_C
1.0 - 1.2 k
Wat 80
_C
0.57 - 0.69 k
Wat 100
_C
Check the following connectors:<6G7> C-04, D-122,
D-121,<4M4> D-108, C-04


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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>AUTOMATIC TRANSMISSION -Troubleshooting <A/T>AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-18
OK
(2)NG
From the previouspage
Repair
OK
Repair
Check the following connector:E-113
Repair
Measure at solenoid valve assembly
connector C-04.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
(2) Resistance between terminal 2
and earth
OK:2
Wor lessOK
OK
OKNG NG (1)NG
NG
DCheck the harness between the
solenoid valve assembly and the
engine-A/T-ECU (earth line), and
repair if necessary. <6G7>
DCheck the harness between the
solenoid valve assembly and the
A/T-ECU (earth line), and repair if
necessary.<4M4>
DCheck the harness between the
solenoid valve assembly and the
engine-A/T-ECU (power supply
line), and repair if necessary.
<6G7>
DCheck the harness between the
solenoid valve assembly and the
A/T-ECU (power supply line), and
repair if necessary.<4M4>
DCheck the harness between the
solenoid valve assembly and the
engine-A/T-ECU, and repair if
necessary. <6G7>
DCheck the harness between the
solenoid valve assembly and the
A/T-ECU, and repair if necessary.
<4M4>Check the following connector:E-113
Check the following connector:E-113
Code No. 21 Crank angle sensor <6G7> or engine speed
sensor <4M4> systemProbable cause
If no output pulse from the crankanglesensor orenginespeed sensor is
detected for 5 seconds or more when the vehicle speed is 25 km/h or more, it
is judged that there is an opencircuit in the crankanglesensor or anopen
circuit in theenginespeed sensor, and code No. 21 is output.DMalfunction of crankshaft sensingblade<6G7>
DMalfunction of crankanglesensor <6G7>
DMalfunction of enginespeed sensor<4M4>
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
Check the following connectors:
<6G7> B-52,<4M4>B-36Repair
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.)
OK NG
NGOKMUT-
IIData List
DNo. 21 Crankanglesensor
<6G7>
No. 21 Engine speed sensor
<4M4>
OK:Refer to P.23-61 (Data List
Chart).
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AUTOMATIC TRANSMISSION -Troubleshooting <A/T>23-19
OK NGCheck the following connectors:
<6G7> D-120,<4M4> D-113, D-108 OK OK
Repair OK Repair
OK
DCheck the harness between the
crankanglesensor and body
earth, and repair if necessary.
<6G7>
DCheck the harness between the
injection pumpassembly and
body earth, and repair if
necessary.<4M4> (1)NG
(2)NG
OK
NG
Measure at engine-A/T-ECU
connector D-120 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals
DDisconnect connector B-52
<6G7>, or connector B-36
<4M4>.
DIgnition switch: ON
D<6G7> Voltage between terminal
45 and earth
D<4M4> Voltage between terminals
33 and earth
OK:4.8 - 5.2 V
NG
RepairCheck the following connectors:
<6G7> D-120,<4M4> D-113,D-108
NG
Check the trouble symptoms.
Replace the engine-A/T-ECU or
A/T-ECU.
NG
Repair
OKCheck the following connector:
B-25X
(3)NG
OK
Measure at crankanglesensor
connector B-52 <6G7>, or at
injection pumpassembly connector
B-36 <4M4>.
DDisconnect the connector and
measure at the harness side.
(1) <6G7> Resistance between
terminal 1 and earth
<4M4>Resistance between
terminal 4 and earth
OK:2
Wor less
(2) Voltage between terminal 2 and
earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
(3) Voltage between terminal 3 and
earth
(Ignition switch: ON)
OK:System voltageNG
DCheck the harness between the
crankanglesensor and the
engine-A/T-ECU, and repair if
necessary. <6G7>
DCheck the harness between the
injection pumpassembly and the
A/T-ECU, and repair if necessary.
<4M4>
Check the following connectors:
<6G7> B-52,<4M4>B-36
DCheck the harness between the
crankanglesensor and the
engine controlrelay, and repair if
necessary. <6G7>
DCheck the harness between the
injection pumpassembly and the
engine controlrelay, and repair if
necessary.<4M4>
From the previouspage
OK
NG
Replace the engine-A/T-ECU or
A/T-ECU.
Check the trouble symptoms.
Repair NG
NG
Replace the crankshaft sensing
blade. <6G7>
Replace the crankanglesensor
<6G7> or theenginespeed sensor
<4M4>.
Check the trouble symptoms.
Check the following connectors:
<6G7> B-52, D-120, B-25X
<4M4> D-108, D-113,B-36, B-25X
OK
OK
DCheck the harness between the
crankanglesensor and the
engine-A/T-ECU, and repair if
necessary. <6G7>
DCheck the harness between the
enginespeed sensor and the
A/T-ECU, and repair if necessary.
<4M4>
DCheck the harness between the
crankanglesensor and the
engine controlrelay, and repair if
necessary. <6G7>
DCheck the harness between the
enginespeed sensor and the
engine controlrelay, and repair if
necessary.<4M4>
DCheck the harness between the
crankanglesensor and body
earth, and repair if necessary.
<6G7>
DCheck the harness between the
enginespeed sensor and body
earth, and repair if necessary.
<4M4>
Measure the output wave pattern at
crankanglesensor connector
B-52 <6G7>, or at injectionpump
assembly connector B-36<4M4>
(using an oscilloscope).
DUse the test harness (MD998478)
to connect the terminals, and
then measure at the pickup
harness.
DEngine: Idling
DSelector lever position: P
DVoltage between terminal 2 and
earth
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 minimumval-
ue should be 0.6 V or less.
There should be no noise
in the output wave pattern.NG NG
Repair NG
Repair
DCheck the harness between the
crankanglesensor and the
engine-A/T-ECU. <6G7>
DCheck the harness between the
injection pumpassembly and the
A/T-ECU.<4M4>


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