2000 MITSUBISHI MONTERO Service Repair Manual

AUTOMATIC TRANSMISSION -Troubleshooting II>23-71
Diagnosis
codeReference page Diagnosis item
35Freewheel engage switch systemOpen circuit/Short-cir-
cuit/Malfunction of
switch23-83
41Shift actuator (short-circuit/open circuit) systemOpen circuit/Short-cir-
cuit/Malfunction of ac-
tuator/Malfunction of
ECU23-84
42Shift actuator (short-circuit) systemShort-circuit/Malfunc-
tion of actuator/Mal-
function of ECU23-85
43Shift actuator (open circuit) systemOpen circuit/Malfunc-
tion of actuator/Mal-
function of ECU
44Shift actuator (overload) systemMalfunction of transfer
shift mechanism/Mal-
function of actuator23-86
45Tyre problemIncorrect tyre pres-
sure/Uneven tyre sizes23-86
51Malfunction of transfer-ECU23-86


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-72
INSPECTION PROCEDURES CLASSIFIED BY DIAGNOSIS CODE
Code No. 11, 12 Power supply voltage systemProbable cause
Code No. 11 is output to indicate a drop in voltage if the power supply voltage drops
below 9.5 V.
Code No. 12 is output to indicate overvoltage if the power supply voltage rises above
18 V.DMalfunction of ignition switch
DMalfunction of harness or connector
DMalfunction of transfer-ECU
NG OK
OK
Repair NG
Replace
NG
Ignition switch single part check
(Refer to GROUP 54 - Ignition Switch.)
Check the following connectors: D-208,
D-210, D-32, E-115, E-105, D-208, D-210,
E-115, E-105
Repair
Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.)
Measure at transfer-ECU connector E-105
DMeasure at ECU terminals.
DIgnition switch: ON
DVoltage between terminal 13 and earth
OK:System voltage
Check the harness between the ignition switch and the
transfer-ECU, and repair if necessary.
OK
Replace the transfer-ECU. OKOK NG
NGCheck the trouble symptoms.
MUT-
IIData List
DNo. 9 Ignition voltage
OK:Refer to P.23-87 (Data List Chart).
NG
Check the following connector:E-105
Code No. 13 Main relay (inside ECU) systemProbable cause
Code No. 13 is output to indicate a relay malfunction if the voltage rises to 6 V
or higher when the relay is off, or if it drops below 6 V when the relay is on.DMalfunction of transfer-ECU
Replace the transfer-ECU.


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-73
Code No. 21 Accelerator pedal position sensor (APS)
systemProbable cause
Code No. 21 is output to indicate anopencircuit in the APS or an incorrect
adjustment when the APS output voltage drops below 0.2 V while theengine is
idling.DMalfunction of APS
DMalfunction of harness or connector
DMalfunction of transfer-ECU
DMalfunction of throttle valve controller <6G7>
DMalfunction of engine-ECU <4M4>
NGNG
NG
Repair
MUT-
IIData List
DNo. 1 APS
OK:Refer to P.23-87 (Data List
Chart).
NG
ReplaceAPS single part check
(Refer to GROUP 13 - On-vehicle
Service.)
OK
NG
Repair
OK
Check the following connector:
D-135
OK
DCheck the harness between the
APS and the throttle valve
controller, 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-11,<4M4> D-112
Repair
NG
Repair
NG
Repair
OK
DCheck the harness between the
APS and the throttle valve
controller. <6G7>
DCheck the harness between the
APS and the engine-ECU. <4M4>
OK
Check the following connectors:
<6G7> D-11,<4M4> D-112
Measure at throttle valve controller
connector D-11 <6G7>, or at
engine-ECU connector D-112 <4M4>.
DMeasure at ECU terminals.
DIgnition switch: ON
D<6G7> Voltage between terminal
6 and earth
D<4M4> Voltage between terminal
60 and earth
OK:4.8 - 5.2 V
NGNG
NGCheck the trouble symptoms.Replace the throttle valve controller
or the engine-ECU.
OK
Measure at APS connector D-135
DDisconnect the connector and
measure at the harness side.
DVoltage between terminal 8 and
earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
To the nextpage
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.)
OK


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-74
OKOK OK
NG
NG
NG(1)NGCheck the following connectors:
<6G7> D-11,<4M4> D-112
Repair OK
DCheck the harness between the
APS and the throttle valve
controller, and repair if necessary.
<6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4> OK (2)NG
Measure at transfer-ECU connector
E-105
DMeasure at ECU terminals.
DIgnition switch: ON
DVoltage between terminal 13 and
earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
Check the following connector:E-105
Check the trouble symptoms.OK
Check the following connectors:
E-105, E-113 NG
Replace the transfer-ECU. OK
NGRepair
Check the harness between the APS
and the transfer-ECU, and repair if
necessary.
Check the harness between the APS
and the transfer-ECU, and repair if
necessary.
From the previouspage
(3)NG
Measure at APS connector D-135.
DUse the test harness
(MB991658) to connect only
terminals 6, 7 and 8, and
measure at the pickup harness.
DIgnition switch: ON
(1) Voltage between terminal 7 and
earth
OK:0.5 V or less
(2) Voltage between terminal 8 and
earth
OK:4.8 - 5.2 V
(3) Voltage between terminal 6 and
earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
APS adjustment
(Refer to GROUP 13 - On-vehicle
Service.)
Check the following connectors:
E-113, E-105
Repair


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-75
Code No. 22, 23 Front propeller shaft speed sensor
systemProbable cause
Code No. 22 is output to indicate anopencircuit or short-circuit in the front
propeller shaft speed sensor if no signal is input from the front propeller shaft
speed sensor when shifting from 2WD to 4WD while driving atmedium to low
speeds.
Code No. 23 is output to indicate anopencircuit or short-circuit in the front
propeller shaft speed sensor if the signal input from the front propeller shaft
speed sensor is unstable when the freewheelengageswitch is on.DMalfunction of front propeller shaft speed sensor
DMalfunction of harness or connector
DMalfunction of transfer-ECU
Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.)
OK NG
OK
OK
To the nextpage
NG
OK
NG
NG
Repair
Replace the transfer-ECU.
OKMUT-
IIData List
DNo. 2 Front propeller shaft speed sensor
OK:Refer to P.23-87 (Data List Chart).
OK
OK
NG
OK
Measure at transfer-ECU connector E-105
DMeasure at ECU terminals.
DIgnition switch: ON
DVoltage between terminals 18 and earth
OK:0.5 V or less
NG
Repair
Replace the transfer-ECU.
NG
Check the trouble symptoms.
Check the trouble symptoms.
Replace the transfer-ECU.
OK
OK
Measure at transfer-ECU connector E-105
DMeasure at ECU terminals.
DDisconnect front propeller shaft speed sensor connector
C-17.
DIgnition switch: ON
DVoltage between terminals 7 and earth
OK:4.8 - 5.2 V
Measure the front propeller shaft speed sensor output wave
pattern at transfer-ECU connector E-105 (using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 3rd
DVoltage between terminals 7 - 18
OK:A wave pattern such as the one shown on P.23-69
(Check Procedure Using an Oscilloscope tern B>) 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.
NG
RepairCheck the following connectors:C-17, E-105NG
NG
Repair
Check the following connector:E-105Repair
NG
Check the harness between the front propeller shaft speed
sensor and the transfer-ECU.
Check the following connector:C-17
Check the trouble symptoms.
Check the following connector:E-105


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