ECU MITSUBISHI MONTERO 2000 Service Repair Manual

AUTOMATIC TRANSMISSION -Troublehshooting II>23-82
Code No. 34 Freewheel engage solenoid valve systemProbable cause
Code No. 34 is output to indicate anopencircuit or short-circuit in the freewheel
engage solenoidvalve when the transfer-ECU terminal voltages are not the
same while current isbeing supplied to the freewheel engage solenoidvalve.DMalfunction of freewheel engage solenoidvalve
DMalfunction of harness or connector
DMalfunction of transfer-ECU
NG
NG
MUT-
IIActuator Test
DNo. 1 Freewheel engage solenoidvalve
OK:The solenoid valve operates for 5 seconds.Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.) OK
OK OK OKNG
DCheck the harness between the freewheelengage solenoid
valve and the transfer-ECU, and repair if necessary.
DCheck the harness between the freewheelengage solenoid
valve and the ignition switch, and repair if necessary.Repair
Check the harness between the freewheelengage solenoid
valve and the ignition switch, and repair if necessary.
OK OK
OK
NG
Check the trouble symptoms.Replace the transfer-ECU.
Measure at transfer-ECU connector E-108
DMeasure at ECU terminals.
DTransfer: 4WD
DIgnition switch: ON
DVoltage between terminals 41 and earth
OK:System voltage
Measure at freewheel engage solenoidvalve connectors A-40
and A-41.
DDisconnect the connector and measure at the harness
side.
DIgnition switch: ON
DVoltage between terminal 1 and earth
OK:System voltageNG
Replace
NG
Repair
Freewheel engage solenoidvalve check
(Refer to GROUP 26 - On-Vehicle Service.)
Check the following connectors:A-40, A-41
Repair NG
Check the following connector:E-108
NG
Repair
OK
Check the following connectors: D-208,
D-210, D-27, A-15, A-16, A-04, E-113, E-108,
D-208, D-210, D-27, A-15, A-16, D-143, E-113, E-108,
Check the following connectors:D-208, D-210, D-27, A-15


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-83
Code No. 35 Freewheel engage switch systemProbable cause
Code No. 35 is output to indicate anopencircuit or short-circuit in the freewheel
engageswitch when the freewheelengageswitch condition does not correspond
to the fact that current isbeing supplied to the freewheel engage solenoidvalve.DMalfunction of freewheel engageswitch
DMalfunction of harness or connector
DMalfunction of transfer-ECU
NG
(1)NG
MUT-
IIData List
DNo. 38 Freewheel engageswitch
OK:Refer to P.23-87 (Data List Chart).Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.) OK
OK OK OKNG
Repair
Check the following connector:B-40
Check the harness between the freewheelengageswitch and
earth, and repair if necessary.
OK
OK
Check the trouble symptoms.Replace the transfer-ECU.
Measure at freewheel engageswitch connector B-54.
DDisconnect the connector and measure at the harness
side.
(1) Resistance between terminal 1 and earth
OK:2
Wor less
(2) Voltage between terminal 2 and earth
(Ignition switch: ON)
OK:System voltageNG
Replace
NG
Repair
Freewheel engageswitch check (Refer to GROUP 26 -
Freewheel Clutch.)
Check the following connector:B-54
MUT-
IISelf-Diag Code
DIs code No. 34 output?Code No. 34 Freewheelengage solenoidvalve system check
(Refer to P.23-82.) YES
NO
NG
(2)NG
NG
OK
Repair
Check the following connectors:E-108, E-113, B-40
Check the harness between the freewheelengageswitch and
the transfer-ECU, and repair if necessary.
Check the following connector:B-54Repair
NG


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-84
Code No. 41 Shift actuator system (open circuit or
short-circuit)Probable cause
Code No. 41 is output to indicate anopencircuit or short-circuit in the shift
actuator if the transfer-ECU terminal voltage is higher than themainrelay
voltage (90% of the rated voltage), or lower than themainrelay voltage (10% of
the rated voltage) when shift operation is notbeingcarried out.DMalfunction of shift actuator
DMalfunction of harness or connector
DMalfunction of transfer-ECU
LRefer to the Transmission Workshop Manual.
NG
NG
NG
MUT-
IIData List
DNo. 12 Shift actuator voltage
OK:Refer to P.23-87 (Data List Chart).Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.) OK
OK NG
Check the harness between the shift actuator and the
transfer-ECU, and repair if necessary.Repair
OKOK
OK
OK
NG
NG
Replace the transfer-ECU.
Check the following connectors:C-11, E-105Measure at shift actuator connector C-11.
DDisconnect the connector and measure at the harness
side.
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 2.
DVoltage between terminals 2 and earth
OK:System voltage
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 3.
DVoltage between terminal 1 and earth
OK:System voltage
Measure at transfer-ECU connector E-105
DMeasure at ECU terminals.
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 2.
DVoltage between terminal 1 and earth
OK:System voltage
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 3.
DVoltage between terminals 3 and earth
OK:System voltage
Repair NG
Check the following connector:C-11Repair
Replace the shift actuator.
L
Check the following connector:E-105
Check the trouble symptoms.


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-85
Code No. 42 Shift actuator system (short-circuit)Probable cause
Code No. 43 Shift actuator system (open circuit)
Code No. 42 is output to indicate a short-circuit in the shift actuator if the shift
actuator current is +1 A greater than the target value while the actuator isbeing
driven.
Code No. 43 is output to indicate anopencircuit in the shift actuator if themain
relay voltage is lower than 6 V, or the shift actuator current is 0.1 A lower than
the actual value while the actuator isbeing driven.DMalfunction of shift actuator
DMalfunction of harness or connector
DMalfunction of transfer-ECU
LRefer to the Transmission Workshop Manual.
NG
NG
MUT-
IIData List
DNo. 10 Shift actuator voltage
OK:Refer to P.23-87 (Data List Chart).Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.) OK
OK NG
Check the harness between the shift actuator and the
transfer-ECU, and repair if necessary.Repair
Check the following connector:E-105
OK OK
NG
OK
OK
NG
NG
Check the trouble symptoms.
Replace the transfer-ECU.
Check the following connectors:C-11, E-105Measure at shift actuator connector C-11.
DDisconnect the connector and measure at the harness
side.
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 2.
DVoltage between terminals 2 and earth
OK:System voltage
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 3.
DVoltage between terminal 1 and earth
OK:System voltage
Measure at transfer-ECU connector E-105
DMeasure at ECU terminals.
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 2.
DVoltage between terminal 1 and earth
OK:System voltage
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 3.
DVoltage between terminals 3 and earth
OK:System voltage
Repair NG
Check the following connector:C-11Repair
Replace the shift actuator.
L


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AUTOMATIC TRANSMISSION -Troublehshooting II>AUTOMATIC TRANSMISSION -Troublehshooting II>23-86
Code No. 44 Shift actuator system (overload)Probable cause
Code No. 44 is output to indicate an overload of the shift actuator when the
total time calculated for driving the shift actuator exceeds 5 minutes.DMalfunction of shift actuator
DMalfunction of harness or connector
DMalfunction of transfer-ECU
DMalfunction of transfer shift mechanism
LRefer to the Transmission Workshop Manual.
NG
NG
MUT-
IIData List
DNo. 12 Shift actuator voltage
OK:Refer to P.23-87 (Data List Chart).Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.) OK
OK NG
Check the harness between the shift actuator and the
transfer-ECU, and repair if necessary.Repair
Check the following connector:E-105
OK
NG
OK
OK
NG
Replace the transfer-ECU.
Check the following connectors:C-11, E-105Measure at shift actuator connector C-11.
DDisconnect the connector and measure at the harness
side.
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 2.
DVoltage between terminals 2 and earth
OK:System voltage
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 3.
DVoltage between terminal 1 and earth
OK:System voltage
Measure at transfer-ECU connector E-105
DMeasure at ECU terminals.
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 2.
DVoltage between terminal 1 and earth
OK:System voltage
DDrive the shift actuator in accordance with MUT-
IIactuator
test No. 3.
DVoltage between terminals 3 and earth
OK:System voltage
Repair NG
Check the following connector:C-11Repair
MUT-II Actuator test
DNo. 2, No. 3 Shift actuator
OKRefer to P.23-89 (Actuator Test).
OKNGReplace the shift actuator.
L
Code No. 45 Incorrect tyre diametersProbable cause
Code No. 45 is output to indicate incorrect tyre pressure, uneven tyre sizes or
non-uniform tyre brands, which have caused a large difference in speed between
the front and rear wheel speeds and the setting values when the freewheel
engageswitch is on.DMalfunction of tyre
DMalfunction of transfer-ECU
NG
Replace
Replace the transfer-ECU. NGCheck the trouble symptoms.
OK
Tyre Check
Code No. 51 Malfunction of transfer-ECUProbable cause
Code No. 51 is output when a problem with the transfer-ECU is detected.DMalfunction of transfer-ECU
Replace the transfer-ECU.


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O
N-V EH IC LE SER VIC E
B ASIC ADJU STM EN T PR O CED URES
A UTO M ATIC TR ANSM IS SIO N FLU ID (A TF) CHEC K
N O TE
W hen re pla cin g th e tr a nsm is sio n wit h anew one,o ve rh aulin g
t h e exis tin g tr a nsm is sio n, or driv in g in ahars h co ndit io n, th e
A T F co ole r lin e sh ould alw ays be flu sh ed outa nd AT F sh ould
b e re pla ce d wit h a new one.
1 . Driv e th e ve hic le until th e AT F te m pera tu re re ach es th e
n orm al te m pera tu re (7 0 -80
°C
).
N O TE
1 ) Measu re AT F te m pera tu re usin g MUT-I
I
.
2 ) Check th e oil le ve lre fe rrin g to th e ch ara cte ris tic s ch art
s h ow n atle ft if it ta ke s so m etim eto re ach th e norm al
o pera tio n te m pera tu re of AT F (7 0 -80
°C
.)
2 . Park th e ve hic le on ale ve l su rfa ce .
3 . Move th e se le cto r le ve r to all posit io ns to fu lly ch arg e
t h e to rq ue co nve rte r and th e flu id lin es wit h AT F, and
t h en move th e se le cto r le ve r to th e “N ” posit io n.
4 . Afte r w ip in g aw ay any dir t fr o m aro und th e oil le ve lg auge,
p ull out th e oil le ve l gauge and ch eck th e le ve l of AT F.
N O TE
I f th e AT F has a burn t sm ell, or if it has beco m e ve ry
c o nta m in ate d or dir ty , it m eans th at th e AT F has beco m e
c o nta m in ate d by min ute partic le s fr o m bush in gs (m eta l)
o r worn parts . In su ch a ca se , th e tr a nsm is sio n needs
t o be ove rh aule d and th e AT F co ole r lin e needs to be
f lu sh ed out.
5 . Check th at th e AT F le ve l is betw een th e “H O T” m ark s
o n th e oil le ve l gauge. If th e AT F le ve l is to o lo w , add
m ore AT F until th e le ve l re ach es betw een th e “H O T”
m ark s.
A uto m atic tr a n sm is sio n flu id :
D IA QUEEN ATF SP I
I
M,SP I
II
or eq uiv ale n t
N O TE
I f th e AT F le ve l is to o lo w , th e oil pum p dra w s air in to
t h e syste m alo ng wit h th e AT F, and air bubble s will th us
f o rm in th e flu id cir c u it . This will ca use a dro p in flu id
p re ssu re and ca use th e sh if t poin ts to ch ange and th e
c lu tc h es and bra ke s to slip .
I f th e AT F le ve l is to o hig h, th e gear will ch urn th e AT F
a nd ca use bubble s to deve lo p, whic h ca n th en ca use
t h e sa m e pro ble m s as when th e AT F flu id is to o lo w .
I n eit h er ca se , th e air bubble s ca n ca use ove rh eatin g
a nd oxid atio n of th e AT F, and als o pre ve nt th e va lv e s,
c lu tc h es and bra ke s fr o m opera tin g norm ally . In addit io n,
i f bubble s deve lo p in th e AT F, th e AT F ca n ove rflo w fr o m
t h e tr a nsm is sio n ve nt hole s and be mis ta ke n fo r le aks.
6 . Secu re ly re -in se rt th e oil le ve l gauge. 0
(
m m) -
3 0
40
-
2 0 -
1 0 1
0 T
e m pera tu re (
° C
) 6
0 2
0 O
il
l e ve l
-4 0
80

T
O E CO NTR O L ARM ASSEM BLY /T O E CO NTR O L TO W ER BAR
R EM OVA L AND IN STA LLA TIO N
C au tio n
* : To pre ven t bush in gs fr o m bre akag e, th e parts in dic ate d by *sh ould be te m pora rily tig hte n ed ,
a n d th en fu lly tig hte n ed wit h th e veh ic le on th e gro und in th e unla d en co ndit io n. 3
1 54
6
±8
N
×m 5
R em oval ste p s
1 . P ark in g bra ke ca ble mountin g bolt
2 . To e co ntr o l to w er bar
A A"
3. To e co ntr o la rm ball jo in t and kn uckle
c o nnectio n A
B"
4. B olt asse m bly (fo r to e adju stm ent)
5 . To e co ntr o l arm asse m bly
R EM OVA L SER VIC E PO IN TS
A A"
TO E CO NTR O L ARM BALL JO IN T AND
K NUCKLE SEPA RATIO N
C au tio n
1 . To pre ven t th e ball jo in t th re ad fr o m dam ag e, only
l o osen but do not re m ove th e nut secu rin g th e to e
c o ntr o l arm to th e kn uckle fr o m th e ball jo in t an d
u se th e sp ecia l to ol. N
ut M
B991406,
M B990635 or
M B9911 1 3 B
oot w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k

BASIC BRAKE SYSTEM -Troubleshooting35A-9
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis
code No.Diagnosis itemsReference page
16*ABS-ECU power supply (Abnormal voltage decrease or increase)35A-9
17, 18ABS-ECU power supply (Open circuit or short circuit)
53Motor relay system (open circuit, short circuit or motor relay coil failure)35A-10
55Pump motor system (Pump motor seized or abnormal ABS-ECU current
detection circuit)35A-11
63ABS-ECU systemReplace ABS-ECU
(Refer to 35B.)
78Accumulator system (Motor has been energized abnormally for long time
or abnormal low-pressure accumulator)35A-12
79Pressure switch system (open circuit or short circuit)35A-13
NOTE
*: Code No. 16 is erased by turning the ignition switch OFF.
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code No.16 ABB-ECU power supply system (abnormal
voltage increase or decrease)Probable cause
Code No.17, 18 ABS-ECU power supply system (open or
short circuit)
Code No.16 is output if the ABS-ECU power supply voltage is increased or decreased
than the specified.
Code No.17, 18 is output if the ABS-ECU power supply circuit isopen orshort, or
the ABS-ECU internal circuit is defective.
In addition, code No. 16 is erased by turning the ignition switch OFF.DMalfunction of the battery
DMalfunction of connector or harness
DMalfunction of the ABS-ECU
Caution
If the battery voltage is decreased or increased during the test, code No. 16 is output as a present
malfunction, disabling a correct diagnosis. Check the battery and fully charge it if necessary before
carrying out the following tests.
NG
NG
OK
NG
Replace the ABS-ECU. (Refer to GROUP 35B.)
OK
Check trouble symptom.
NG
Repair
NG
Check the harness wire, and repair if necessary.
DBetween the ignition switch and the ABS-ECU
OK
Check trouble symptom.
Measure at the ABS-ECU connector E-107.
DDisconnect the connector, and measure at the harness side.
DStart theengine and then measure the voltage between terminal
31 and the body earth.
OK:System voltageNGCheck the following connectors:E-13, E-107
Repair
OK
Check the following connectors:E-106, E-107
NG
Check the harness wire, and repair if necessary.
DBetween the ignition switch and the ABS-ECU
OK
Check trouble symptom.
Measure at the ABS-ECU connector E-106.
DDisconnect the connector, and measure at the harness side.
DStart theengine and then measure the voltage between terminal
13 and the body earth.
OK:System voltageNG
Check the following connectors:D-32 ,
D-128, D-208, D-210 , D-213 vehicles>, E-08 , E-13, E-106
Repair


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BASIC BRAKE SYSTEM -Troubleshooting35A-10
Code No.53 Motor relay system (open circuit, short circuit
or a defective motor relay coil)Probable cause
This code is output if the motor relay circuit is short or open, ABS-ECU internal circuit
is defective, or the hydraulic brake booster (HBB) master cylinder and hydraulic unit
assembly is defective.DMalfunction of connector or harness
DMalfunction of the motor relay
DMalfunction of the ABS-ECU
DMalfunction of the HBB (master cylinder and
hydraulic unit assembly)
NG
Replace the ABS-ECU. (Refer to GROUP 35B.)NG
Repair
NG
OK
Check trouble symptom.
Repair NGNG
OK
Check trouble symptom.
Replace
OK
Check the following connectors:
B-17, B-18, B-19X, B-20X,
D-32 , D-128, D-208, D-210 vehicles>, D-213 , E-13, E-106, E-107
Check the harness wire:
DBetween the ignition switch and the motor relay
DBetween fusible link No.9 and the motor relay
DBetween the motor relay and HBB
DBetween the motor relay and the ABS-ECU
DBetween the HBB and the ABS-ECU
Check trouble symptom.
NG
NG
Replace
OK
Check the motor relay. (Refer to P.35A-24.)
Check the hydraulic brake booster (HBB).
(Refer to P.35A-23.)


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BASIC BRAKE SYSTEM -Troubleshooting35A-11
Code No.55 Pump motor system (pump motor seized or
abnormal ABS-ECU current detection circuit)Probable cause
This code is output if the motor relay drive circuit is short or open, the motor relay
or the ABS-ECU internal circuit is defective, or the hydraulic brake booster (HBB)
pump motor ormaster cylinder and hydraulic unit assembly is defective.DMalfunction of connector or harness
DMalfunction of the motor relay
DMalfunction of the ABS-ECU
DMalfunction of the HBB (pump motor or master
cylinder and hydraulic unit assembly)
NG
Repair
NG
OK
Check trouble symptom.
Repair NGNG
OK
Check trouble symptom.
Replace
OK
Check the following connectors:
B-17, B-18, B-19X, B-20X,
E-107
Check the harness wire:
DBetween fusible link No.9 and the motor relay
DBetween the motor relay and HBB
DBetween the HBB and the ABS-ECU
DBetween the HBB and the earthNG
Check the motor relay. (Refer to P.35A-24.)
NG
Replace the ABS-ECU. (Refer to GROUP 35B.)
Check trouble symptom.
NG
OKCheck the hydraulic brake booster (HBB).
(Refer to P.35A-23.)Replace NG
Replace
OKCheck the continuity and resistance of thepump motor.(Refer
to P.35A-23.)


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