engine MITSUBISHI MONTERO 2000 Service Repair Manual

AUTOMATIC TRANSMISSION -Troubleshooting 23-60
Inspection procedure 20
4LLc switch system
Probable cause
The cause is probably a malfunction of the 4LLc switch circuit, or of the
engine-A/T-ECU or A/T-ECU.DMalfunction of 4LLc switch
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
4LLc switch check (Refer to P.23-99.)NG
4LLc switch connector C-06 voltage check
DDisconnect the connector and measure at the
harness side.
DIgnition switch: ON
DVoltage between terminal 1 and earth
OKFSystem voltageCheck the following connectors:<6G7> C-06,
E-113, D-122, <4M4>C-06, E-113, D-107NG
Repair OK
Check the trouble symptoms.Replace
OKReplace the engine-A/T-ECU or A/T-ECU. NG
DCheck the harness between 4LLc switch and
the engine-A/T-ECU, and repair if necessary.
<6G7>
DCheck the harness between 4LLc switch and
the A/T-ECU, and repair if necessary.<4M4>
Check the following connector:C-06
NG
Repair
OK
NGOK


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-61
DATA LIST REFERENCE TABLE
Data
list No.Check itemInspection conditionsNormal condition
11APSIgnition switch: ON
Engine: StoppedAccelerator pedal:
Fully closed985 - 1085 mV
Engine: Stopped
Selector lever posi-
tion: P
Accelerator pedal:
DepressedGradually increases from the above
value.
Accelerator pedal:
Fully open4000 mV or higher
15A/T fluid tempera-
ture sensorDriving after en-
gine has warmed
upDrive for 15 minutes
or more until the ATF
temperature reaches
70 - 80°C.Gradually increases to 70 - 80°C.
21Crank angle sen-
sor <6G7>Engine: Idling
Selector lever posi-Compare the engine
speeds displayed onIdentical
sor <6G7>
Engine speed sen-
sor <4M4>Selector lever posi-
tion: Pspeeds displayed on
the tachometer and
the MUT-II.
22Input shaft speed
sensorShift range: 4thDriving at a constant
speed of 50 km/h in
4th1300 - 1600 r/min
23Output shaft speed
sensorShift range: 4thDriving at a constant
speed of 50 km/h in
4th1300 - 1600 r/min
25Wide open throttleAccelerator pedalReleasedOFF
switchpositionDepressedON
26Stop lamp switchIgnition switch: ON
Engine: StoppedBrake pedal: De-
pressedON
Engine: Stopped
Brake pedal: Re-
leasedOFF
29Vehicle speed sen-
sorSelector lever posi-
tion: Sports modeIdling in 1st
(Vehicle stopped)0 km/h
Driving at a constant
speed of 50 km/h in
3rd50 km/h
31LR solenoid valve
duty ratioSelector lever posi-
tion: Sports modeData List No.No. 31No. 32No. 33No. 34No.35
32UD solenoid valve
duty ratioDriving at a constant
speed in 1st0%0%100%100%0%
332nd solenoid valve
duty ratioDriving at a constant
speed in 2nd100%0%0%100%0%
34OD solenoid valve
duty ratioDriving at a constant
speed in 3rd100%0%100%0%0%
35RED solenoid
valve duty ratioDriving at a constant
speed in 4th0%0%100%0%100%
Driving at a constant
speed in 5th100%100%0%0%100%


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-62
Data
list No.Normal condition Inspection conditions Check item
36DCC solenoid
valve duty ratioShift range: 2ndDriving at 30 km/h in
2 range, then fully
close accelerator.70% - 90% -to- 0%
Driving at 50 km/h in
4th70% - 90%
52Damper clutch slip
amountShift range: 2ndDriving at 30 km/h in
2 range, then fully
close accelerator.- 300 - 100 r/min or 100 - 300 r/min
Driving at a constant
speed of 50 km/h in
4th- 10 - 10 r/min
54Control relay out-
put voltageIgnition switch:
OFFIgnition switch: ON10 - 12 V
61Inhibitor switchIgnition switch: ON
Engine: StoppedSelector lever posi-
tion: PP
Engine: Stopped
Selector lever posi-
tion: RR
Selector lever posi-
tion: NN
Selector lever posi-
tion: DD
63Shift positionSelector lever posi-
tion:
Sports modeDriving at a constant
speed of 10 km/h in
1st1st
Driving at a constant
speed of 30 km/h in
2nd2nd
Driving at a constant
speed of 50 km/h in
3rd3rd
Driving at a constant
speed of 50 km/h in
4th4th
Driving at a constant
speed of 70 km/h in
5th5th
65Dual pressureEngine: IdlingA/C switch: ONON
switchA/C switch: OFFOFF
66OD-OFFsignal
control is operatingWhile driving on a
level roadOFF
auto-cruise control
system>While climbing an
inclineON


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-63
Data
list No.Normal condition Inspection conditions Check item
67Select switchIgnition switch: ON
Engine: Stopped(Data List No. )No.
67No.
68No. 69
Engine: Stopped
Selector lever posi-
tion: DOFFOFFOFF
68Upshift switchSelector lever opera-
tion: Sports mode
selectedONOFFOFF
69Downshift switchSelector lever opera-
tion: Lever moved to
upshift position and
heldONONOFF
Selector lever opera-
tion: Lever moved to
downshift position
and heldONOFFON
73Target effective en-
gine pressure
<6G7>Engine: Idling
Selector lever posi-
tion: NAccelerator pedal:
fully closed to de-
pressedData changes.
754LLc switchIgnition switch: ON
Engine: StoppedTransfer lever posi-
tion: 4LLcON
Transfer lever posi-
tion:
Other than the aboveOFF
76Theoretical effec-
tive engine pres-
sure
<4M4>Engine: Idling
Selector lever posi-
tion: NAccelerator pedal:
fully closed to de-
pressedData changes.
ACTUATOR TEST TABLE
Item No.Check itemTest contentsInspection conditionsNormal condition
1LR solenoid valveThe solenoid valveIgnition switch: ONThe sound of opera-
2UD solenoid valvespecified by the MUT-Selector lever posi-tion should be heard
32nd solenoid valve
IIis driven at 50%
duty for 5 seconds. Notion: P
Engine: Stoppedwhen the solenoid
valve is driven.
4OD solenoid valveother solenoid valvesEngine: Stopped
Throttle (accelerator)
5RED solenoid valve
are energised.Opening angle volt-
6DCC solenoid valveage: Less than 1 V
<6G7>,
71st shift indicator lampThe indicator lamp for
<6G7>,
less than 1.2 V <4M4>
The shift indicator
82nd shift indicator lampthe shift stage speci-The fail-safe function
should not be operat-lamp illuminates.
93rd shift indicator lamp
fied by the MUT-II
illuminates for 3 sec-should not be operat-
ing.
104th shift indicator lamponds.
115th shift indicator lamp
12A/T control relayThe A/T control relay
turns off for 3 sec-
onds.Data List No. 54
(1) During test: 0 V
(2) Normal: System voltage
(V)


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting AUTOMATIC TRANSMISSION -Troubleshooting 23-65
Ter-
minal
No.Standard value Inspection conditions Check item
1062nd solenoid valveEngine: Idling
Shift range: 2ndSystem voltage
Engine: Idling
Shift range: Park7–9 V
107DCC solenoid valveEngine: Idling
Shift range: 1stSystem voltage
108Inhibitor switch REngine: Idling
Selector lever position: RSystem voltage
Engine: Idling
Shift range: Other than the above0V
109Select switchIgnition switch: ON
Selector lever operation: Sports modeSystem voltage
Ignition switch: ON
Selector lever operation: Other than the above0V
11 0Downshift switchIgnition switch: ON
Selector lever operation: Downshifted in Sports mode
and lever heldSystem voltage
Ignition switch: ON
Selector lever operation: Other than the above0V
11 24LLc switchIgnition switch: ON
Transfer lever position: 4LLcSystem voltage
Ignition switch: ON
Transfer lever position: Other than the above0V
11 5Wide open throttle switchAccelerator pedal: ReleasedSystem voltage
Accelerator pedal: Depressed0V
11 73rd shift indicator lampShift range: 3rdSystem voltage
Shift range: Other than the above0V
11 82nd shift indicator lampShift range: 2ndSystem voltage
Shift range: Other than the above0V
11 9RED solenoid valveEngine: Idling
Shift range: 5thSystem voltage
Engine: Idling
Shift range: Park7-9V
120UD solenoid valveEngine: Idling
Shift range: 1stSystem voltage
Engine: Idling
Shift range: Park7-9V
121Inhibitor switch NIgnition switch: ON
Selector lever position: NSystem voltage
Ignition switch: ON
Selector lever position: Other than the above0V
122Upshift switchIgnition switch: ON
Selector lever operation: Upshifted in Sports mode and
lever heldSystem voltage
Ignition switch: ON
Selector lever operation: Other than the above0V
123Stop lamp switchIgnition switch: ON
Brake pedal DepressedSystem voltage
Ignition switch: ON
Brake pedal Released0V


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-67
Ter-
minal
No.Standard value Inspection conditions Check item
10A/C compressor load signalA/C switch: OFF0V
A/C switch: ONSystem voltage
11Power supplyIgnition switch: OFF0V
Ignition switch: ONSystem voltage
12EarthAt all times0V
13EarthAt all times0V
14OD solenoid valveEngine: Idling
Shift range: 3rdSystem voltage
Engine: Idling
Shift range: Park7-9V
15DCC solenoid valveEngine: Idling
Shift range: 1stSystem voltage
162nd solenoid valveEngine: Idling
Shift range: 2ndSystem voltage
Engine: Idling
Shift range: Park7-9V
172nd shift indicator lampShift range: 2ndSystem voltage
Shift range: Other than the above0V
184th shift indicator lampShift range: 4thSystem voltage
Shift range: Other than the above0V
24Power supplyIgnition switch: OFF0V
Ignition switch: ONSystem voltage
25EarthAt all times0V
26EarthAt all times0V
31Input shaft speed sensorMeasure between terminals (31) and (43) using an
oscilloscope.
Engine: 2 000 r/min
Shift range: 4thCheck Procedure
using an Oscillo-
scope (Refer to
P.23-69.)
32Output shaft speed sensorMeasure between terminals (32) and (43) using an
oscilloscope.
Engine: 2 000 r/min
Shift range: 4thCheck Procedure
using an Oscillo-
scope (Refer to
P.23-69.)
33Engine speed sensorEngine: Idling2.0 - 2.4 V
38Backup power supplyAt all timesSystem voltage
43Sensor earthAt all times0V
44A/T fluid temperature sensorA/T fluid temperature 20°C3.8 - 4.0 V
A/T fluid temperature 40°C3.2 - 3.4 V
A/T fluid temperature 80°C1.7 - 1.9 V
45Accelerator pedal positionAccelerator pedal: Fully closed (engine stopped)0.985 - 1.085 V
sensor (APS)Accelerator pedal: Fully open (engine stopped)4.0 V or higher
51RED solenoid valveEngine: Idling
Shift range: 5thSystem voltage
Engine: Idling
Shift range: Park7-9V
53Output communication withEngine: IdlingOther than 0 V
engine-ECUSelector lever position: D


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting 23-68
Ter-
minal
No.Standard value Inspection conditions Check item
54Input communication withEngine: IdlingOther than 0 V
engine-ECUSelector lever position: D
55Inhibitor switch PIgnition switch: ON
Selector lever position: PSystem voltage
Ignition switch: ON
Selector lever position: Other than the above0V
56Inhibitor switch NIgnition switch: ON
Selector lever position: NSystem voltage
Ignition switch: ON
Selector lever position: Other than the above0V
57Select switchIgnition switch: ON
Selector lever operation: Sports modeSystem voltage
Ignition switch: ON
Selector lever operation: Other than the above0V
58Downshift switchIgnition switch: ON
Selector lever position: Downshifted in Sports mode
and lever heldSystem voltage
Ignition switch: ON
Selector lever operation: Other than the above0V
59Stop lamp switchIgnition switch: ON
Brake pedal DepressedSystem voltage
Ignition switch: ON
Brake pedal Released0V
62DIR solenoid valveEngine: Idling
Shift range: ParkSystem voltage
Engine: Idling
Shift range: 2nd7-9V
65Wide open throttle switchAccelerator pedal: Released4.5 - 5.5 V
Accelerator pedal: DepressedLess than 0.4 V
66Inhibitor switch RIgnition switch: ON
Selector lever position: RSystem voltage
Ignition switch: ON
Selector lever position: Other than the above0V
67Inhibitor switch DIgnition switch: ON
Selector lever position: DSystem voltage
Ignition switch: ON
Selector lever position: Other than the above0V
68Upshift switchIgnition switch: ON
Selector lever position: Upshifted in Sports mode and
lever heldSystem voltage
Ignition switch: ON
Selector lever position: Other than the above0V
69Vehicle speed sensorWhen stopped0V
When starting to drive forward slowly.0 V and 5 V alter-
nates
71A/T control relayIgnition switch: OFF0V
Ignition switch: ON10 - 12 V
72EarthIgnition switch: ON0V


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

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


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

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


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

AUTOMATIC TRANSMISSION -Troubleshooting II>23-87
DATA LIST REFERENCE TABLE
Item
No.Check itemInspection conditionsNormal condition
1Accelerator pedalEngine: StoppedAccelerator pedal: Fully closed985 - 1,085 mV
position sensor
(APS)Selector lever position:
PAccelerator pedal: DepressedGradually increases from
the above value.
Accelerator pedal: Fully open4000 mV or higher
2Front propeller shaft
speed sensorTransfer position: 4WDDriving at a constant speed of
30 km/h30 km/h
3Rear propeller shaftTransfer position: 4WDDriving at a constant speed of30 km/h3Rear propeller shaft
speed sensorTransfer position: 4WDDriving at a constant speed of
30 km/h30 km/h
4Difference between
front and rear pro-
peller shaft speedsTransfer position: 4WDDriving at a constant speed of
30 km/hWithin 5 km/h
5Vehicle speedIdling in 1st (Vehicle stopped)0 km/h
Driving at a constant speed of 50 km/h in 3rd50 km/h
6Transfer lever posi-Ignition switch: ONTransfer shift lever position: 2H2H
tionEngine: StoppedTransfer shift lever position: 4H4H
Transfer shift lever position:
4HLc4HLc
Transfer shift lever position:
4LLc4LLc
7Transfer positionDriving at a constant
speed of 10 km/hTransfer shift lever position:
2H®4H2H - 4H®4H
Transfer shift lever position:
4H®4HLc4H - 4HL®4HL
Engine: Stopped
Selector lever position:Transfer shift lever position:
4HLc®4LLc4HL - 4LL®4LL
NTransfer shift lever position:
4LLc®4HLc4HL - 4LL®4HL
Driving at a constant
speed of 10 km/hTransfer shift lever position:
4HLc®4H4H - 4HL®4H
Transfer shift lever position:
4H®2H2H - 4H®2H
8Main relay voltageIgnition switch: ONSystem voltage (V)
9Ignition voltageIgnition switch: ONSystem voltage (V)
10Shift actuator cur-
rentDuring transfer selection (while motor is running)0A®0.2 A®0A
11Target currentDuring transfer selection (while motor is running)0A®1.5 A®0A
12Shift actuator volt-
ageIgnition switch: ON
Selector lever position: N
Transfer shift lever position: 2H®4H (or 4H®4HLc,
4HLc®4LLc)System voltage (V)
Ignition switch: ON
Selector lever position: N
Transfer shift lever position: 4LLc®4HLc (or 4HLc®4H,
4H®2H)System voltage (V)


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk