wheel MITSUBISHI MONTERO 2000 Service Owner's Manual

GDI -Troubleshooting 13A-113
Terminal
No.Normal condition Check requirements (engine condition) Check item
47Power supplyIgnition switch: ONSystem voltage
59
50Camshaft position sensorEngine: Cranking0.4 - 3.0 V
Engine: Idling0.5 - 2.0 V
51Barometric pressure sensorIgnition switch:Altitude: 0 m3.7 - 4.3 V
ON
Altitude: 1,200 m3.2 - 3.8 V
52Alternator FR terminalDEngine: Warm up, and then idling
DRadiator fan: not operating
DHeadlamp: OFF®ON
DStop lamp: OFF®ON
DRear defogger: OFF®ONVoltage decreases
53Oxygen sensor (rear)DTransmission: 2nd gear
DEngine speed: 3,500 r/min or more
DDriving with the throttle valve widely
open0.6 - 1.0 V
54Power steering fluid
pressure switchEngine: Warm
up, and thenSteering wheel
stationarySystem voltage
idling
Steering wheel
turning0-3V
55Injector driver relayIgnition switch: OFF0 - 0.1 V
Ignition switch: ON0.5 - 1.0 V
56Throttle valve control servoIgnition switch: OFF0 - 0.3 V
relay
Ignition switch: ON0.5 - 1.0 V
57Engine control relayIgnition switch: OFF0-3V
Ignition switch: ONSystem voltage
60Back-up power sourceIgnition switch: OFFSystem voltage
61Air flow sensorEngine: Idling2.2 - 3.2 V
Engine: 2,500 r/min
62Intake air temperature
sensorIgnition switch:
ONIntake air temper-
ature: 0_C3.2 - 3.8 V
Intake air temper-
ature: 20_C2.3 - 2.9 V
Intake air temper-
ature: 40_C1.5 - 2.1 V
Intake air temper-
ature: 80_C0.4 - 1.0 V


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

S
ym pto m S
ta rtin g W
on’t sta rt T
he sta rte r is use d to cra nk th e engin e, but th ere is no co m bustio n wit h in th e
c ylin ders , and th e engin e won’t sta rt. F
ir e s up and die s T
here is co m bustio n wit h in th e cylin ders , but th en th e engin e so on sta lls . H
ard sta rtin g E
ngin e sta rts afte r cra nkin g awhile . I
d lin g H
untin g E
ngin e sp eed doesn ’t re m ain co nsta nt; ch anges at id le . s
ta bilit y R
ough id le U
su ally , a ju dgem ent ca n be base d upon th e move m ent of th e ta ch om ete r
p oin te r, a nd th e vib ra tio n tr a nsm it te d to th e ste erin g wheel, s h if t le ve r, b ody, e tc .
T his is ca lle d ro ugh id le . I
n co rre ctid le sp eed T
he engin e doesn ’t id le at th e usu alco rre ct sp eed. E
ngin e sta ll
( D ie out) T
he engin e sta lls when th e fo otis ta ke n fr o m th e acce le ra to r pedal, re gard le ss
o f w heth er th e ve hic le s is m ovin g or not. E
ngin e sta ll
( P ass out) T
he engin e sta lls when th e acce le ra to r pedalis depre sse d or w hile it is bein g
u se d. D
riv in g H
esit a tio n, S ag “
H esit a tio n” is th e dela y in re sp onse
o f th e ve hic le sp eed (e ngin e sp eed)
t h at occu rs when th e acce le ra to r is
d epre sse d in ord er to acce le ra te
f r o m th e sp eed at w hic h th e ve hic le
i s now tr a ve lin g,o ra te m pora ry dro p
i n ve hic le sp eed (e ngin e sp eed)
d urin g su ch acce le ra tio n.
S erio us hesit a tio n is ca lle d “s a g”. V
ehic le
s p eed I
n it ia la c-
c e le ra to r
p edald e-
p re ssio n N
orm alH
esit a tio n
S ag
T im e P
oor acce le ra tio n is in abilit y to obta in an acce le ra tio n co rre sp ondin g to th e
d egre e of th ro ttle openin g, eve n th ough acce le ra tio n is sm ooth , or th e in abilit y
t o re ach maxim um sp eed. S
tu m ble E
ngin e sp eed in cre ase is dela ye d
w hen th e acce le ra to r pedal is
i n it ia lly depre sse d fo r acce le ra -
t io n.
Norm al
I n it ia l ac-
c e le ra to r
p edal de-
p re ssio n
I d lin g
Stu m ble
T im e
V
ehic le
s p eed

GDI -Troubleshooting 13A-200
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
25BarometricIgnition switch: ONAt altitude of 0 m101 kPaCode No.13A-145
pressure
sensor
At altitude of 600 m95 kPa
25
At altitude of 1,200 m88 kPa
At altitude of 1,800 m81 kPa
26Accelerator
pedal posi-Ignition switch: ON
(Depress and re-Release the acceler-
ator pedal.ONProcedure
No.2813A-192
tion switchlease the accelerator
pedal several times)
Depress the acceler-
ator pedal slightly.OFF
27Power
steering
fluid pres-
sure switchEngine: IdlingWhen steering wheel
is turnedONProcedure
No.3013A-194
28A/C switchEngine: Idling
(The A/C compres-A/C switch: OFFOFFProcedure
No.3113A-194
(The A/C compres-
sor is running when
the A/C switch is on.)
A/C switch: ONON
No.31
31Small lampEngine: IdlingLighting switch: OFFOFFProcedure13A-195
switch
Lighting switch: ONON
No.33
34Air flow sen-Engine: After havingIdlingONCode No.13A-133
sor reset
signalwarmed up
3,000 r/minOFF
12
37VolumetricDEngine coolantIdling20 - 40%--
efficiencytemperature: 85 -
95
_C
Lamps and all
2,500 r/min10 - 30%DLamps and all
accessories: OFF
DTransmission: P
range
Engine is suddenly
racedVolumetric effi-
ciency increases
in response to
racing
38Crank angle
sensorDEngine: Cranking (reading is possible at 2,000
r/min or less)
DTachometer: ConnectedEngine speeds
displayed on the
MUT-IIand
tachometer are
identical.--


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

GDI -Troubleshooting 13A-206
Terminal
No.Normal condition Check condition (Engine condition) Check item
49Engine control relayIgnition switch: OFF0-3V
Ignition switch: ONSystem voltage
51EGR valve (A)Ignition switch: OFF to ON5-8V
53EGR valve (C)
(Repeatedly changes
for approx. 3 seconds)
60EGR valve (B)
62EGR valve (C)
52Power steering fluid
pressure switchEngine: Idling after
warming-upWhen steering wheel is
stationarySystem voltage
When steering wheel is
turned0-3V
55Barometric pressureIgnition switch: ONAt an altitude of 0 m3.7 - 4.3 V
sensor
At an altitude of 1,200 m3.2 - 3.8 V
56Camshaft position sen-Engine: Cranking0.4 - 3.0 V
sor
Engine: Idling0.5 - 2.0 V
58Ignition switch-STEngine: Cranking8 V or more
61A/C switch 2Refer to GROUP 55 - Troubleshooting (Check at A/C-ECU or Engine-ECU
Terminal).
63Injector open circuit
check signalEngine: Increases from idling up to 4,000 r/minThe voltage decreases
slightly (approx. 0.7 V)
from 4.5 - 5.0 V.
64Intake air temperature
sensorIgnition switch: ONWhen intake air tempera-
ture is 0_C3.2 - 3.8 V
When intake air tempera-
ture is 20_C2.3 - 2.9 V
When intake air tempera-
ture is 40_C1.5 - 2.1 V
When intake air tempera-
ture is 80_C0.4 - 1.0 V
65Air flow sensorEngine: Idling2.2 - 3.2 V
Engine speed: 2,500 r/min
66Backup power supplyIgnition switch: OFFSystem voltage
71Oxygen sensorEngine: Running at 2,500 r/min after warming-up
(Check by using a digital voltmeter.)Voltages of 0 V and 0.8
V alternate


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

13E-1
MITSUBISHI STABILITY
CONTROL
(MITSUBISHI SC)
CONTENTS
GENERAL INFORMATION 2................
SERVICE SPECIFICATIONS 4..............
SPECIAL TOOLS 4........................
TROUBLESHOOTING 5....................
ON-VEHICLE SERVICE 18.................
Operation Test of MITSUBISHI SC 18.........Wheel Speed Sensor (FR) Check 18..........
Vehicle Speed Sensor Check 18..............
SC-ECU* 19...............................
G SENSOR 20.............................
WHEEL SPEED SENSOR (FR) 20..........
VEHICLE SPEED SENSOR 20..............
WARNINGS REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICLES
WARNING!
(1) Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to personal
injury or death to service personnel (from inadvertent firing of the air bag) or to the driver and passenger (from rendering
the SRS inoperative).
(2) Service or maintenance of any SRS component or SRS-related component must be performed only at an authorized
MITSUBISHI dealer.
(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B - Supplemental
Restraint System (SRS) before beginning any service or maintenance of any component of the SRS or any SRS-related
component.
NOTE
The SRS includes the following components: front impact sensors, SRS-ECU, SRS warning lamp, air bag module, clock spring and
interconnecting wiring. Other SRS-related components (that may have to be removed/installed in connection with SRS service or
maintenance) are indicated in the table of contents by an asterisk (*).


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

F
unctio ns S
C -E C U R
ece iv e s sig nals fr o m va rio us se nso rs , a nd tr a nsm it s an engin e outp utco ntr o ls ig nal
t o th e engin e-E C U or engin e-A /T -E C U,base d on th e in fo rm atio n. E
ngin e-E C U
< M /T , 4 M 4-A /T > T
ra nsm it s th e engin e in fo rm atio n (s u ch as APS sig nala nd engin e sp eed), w hic h is
r e quir e d fo r co ntr o lth e M it s u bis h iS C ,to th e SC -E C U. C
om pensa te fo r th e engin e outp ut acco rd in g to th e cu rre nt engin e co ndit io n on
r e quest fr o m th e SC -E C U. E
ngin e-A /T -E C U <6G 7-A /T > C
om pensa te fo r th e engin e outp ut acco rd in g to th e cu rre nt engin e co ndit io n on
r e quest fr o m th e SC -E C U. A
/T -E C U <4M 4-A /T > T
ra nsm it s th e tr a nsm is sio n in fo rm atio n (s u ch as sh if t posit io n), w hic h is re quir e d fo r
c o ntr o llin g th e M it s u bis h iS C ,to th e SC -E C U. A
BS-E C U T
ra nsm it s th e wheels p eed se nso r (F R )sig nalto th e SC -E C U. G
se nso r M
easu re s th e ve hic le la te ra lg ra vit y , and tr a nsm it th e in fo rm atio n to th e SC -E C U as
a vo lt a ge sig nal. V
ehic le sp eed se nso r T
ra nsm it s th e ve hic le sp eed (tr a nsm is sio n outp utg ear sp eed) sig nalto th e SC -E C U. S
C warn in g la m p I
llu m in ate s orfla sh es w hen th e SC -E C U tr a nsm it s a sig nalin dic a tin g th e syste m erro r. D
ia gnosis co nnecto r W
hen a dia gnosis co de is se t, th e MUT-II co m munic a te s wit h th e syste m via th is
c o nnecto r. S
ta ndard va lu e G
se nso r outp utvo lt a geV W
hen th e ve hic le is sta tio nary 2
.3 5 -2.6 5 W
hen an arro w on th e G se nso r la belis fa cin g dow n 3
.3 -3.7 N
o. N
am e A
pplic a tio n M
B991502 M
UT-II su b as-
s e m bly C
heckin g th e M IT S U BIS H IS C
( D ia gnosis dis p la y usin g th e M UT-II ) M
B991348 T
e st harn ess se t C
heckin g th e G se nso r

MITSUBISHI SC-Troubleshooting13E-6
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis
code No.Diagnosis itemSC warning lampReference page
27*1SC-ECU power supply system (abnormal voltage drop)Flashes13E-6
51*2Vehicle speed sensor wheel speed sensor system (output
signal abnormality)Flashes13E-7
52Vehicle speed sensor system (open circuit or short-circuit)Flashes13E-8
53*2Wheel speed sensor system (open circuit or short-circuit)Flashes13E-8
55*2G sensor systemFlashes13E-9
71Communication line between the engine-ECU or engine-
A/T-ECU and the systemFlashes13E-10
72Engine-ECU or Engine-A/T-ECU systemIlluminates13E-10
74*2Communication line between the A/T-ECU and the system
<4M4-A/T>Flashes13E-11
81*1The SC - ECU is controlling the system too longFlashes13E-11
NOTE
*1: Code No.27 and 81 are erased from the memory if the condition returns to normal.
*2: For code Nos.51, 53, 55 and 74, a diagnosis code will be set in ten seconds after a failure is detected.
INSPECTION PROCEDURE FOR DIAGNOSIS CODE
Code No. 27 SC-ECU power supply system (abnormal
voltage drop)Probable cause
This diagnosis code will be set if the SC-ECU power supply voltage drops below
a certain level.DMalfunction of battery
DMalfunction of harness or connector
DMalfunction of the SC-ECU
Caution
If the system voltage drops during inspection, this code will be output to indicate a current problem.
And correct problem diagnosis will not be possible. Before carrying out the following procedure,
check the battery and recharge it if necessary.


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

MITSUBISHI SC-Troubleshooting MITSUBISHI SC-Troubleshooting13E-7
OK
NG
Repair
OK
Check the trouble symptoms.
NG
OKNG
Repair
OK
(1)NGCheck the following connectors:
B-25X, D-128, E-122,
E-121
NG
Check the harness wire between the engine control relay and
the SC-ECU, and repair if necessary. (2)NG
OK
Check the trouble symptoms.
NG
Replace
NG
Check the harness wire between the battery and the SC-ECU,
and repair if necessary.
Check the following connectors:
D-27, D-223 ,
D-31 , E-13, E-122, E-120
Measure at SC-ECU connectors E-120, E-121.
DDisconnect the connector and measure at the harness
side.
(1) Voltage between terminal 25 and body earth
(Ignition switch: ON)
OK:
System voltage
(2) Voltage between terminal 39 and body earth
OK:
System voltage
NG (1)NG
Check the harness wire between the SC-ECU and the body
earth, and repair if necessary.
Repair
NG
Replace the SC-ECU.
Check the trouble symptoms.
Check the following connectors:
E-120, E-122
NG
(2), (3)NG
Check the harness wire between the SC-ECU and the body
earth, and repair if necessary.
OK
NG
Repair
NGCheck the trouble symptoms.
Check the following connector:
E-121, E-122
OK
Check the trouble symptoms.
Measure at SC-ECU connector E-120, E-121.
DDisconnect the connector and measure at the harness
side.
(1) Continuity between 31 and body earth
OK:
Continuity
(2) Continuity between 13 and body earth
OK:
Continuity
(3) Continuity between 26 and body earth
OK:
Continuity
Check the trouble symptoms.
Check the fusible link No.2 and dedicated fuse No.7
Code No. 51 Vehicle speed sensor systemProbable cause
This diagnosis code will be set when the vehicle speed signal from the vehicle
speed sensor is not the same as that from the wheel speed sensor (FR).DMalfunction of vehicle speed sensor system
DMalfunction of wheel speed sensor system
DMalfunction of the SC-ECU
NG
Check the trouble symptoms.
Replace the SC-ECU.YES
NOCheck the vehicle speed sensor system (Refer to Basic
Manual GROUP 54A - Combination Meter).Does the speedometer operate normally?
YES
NOCheck the ABS system (Refer to Basic Manual GROUP 35B
- ABS).Does the ABS system operate normally?


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

MITSUBISHI SC-Troubleshooting13E-8
Code No. 52 Vehicle speed sensor system (open circuit
or short-circuit)Probable cause
This diagnosis code will be set when the vehicle speed sensor does not send
vehicle speed signal to the SC-ECU.DMalfunction of vehicle speed sensor
DMalfunction of harness or connector
DMalfunction of the SC-ECU
NG
OK
Repair
NG
Check the trouble symptoms.
Replace the SC-ECUNG
OK
Repair YES
NOCheck the vehicle speed sensor system
(Refer to Basic Manual GROUP 54A - Combination Meter).
NG
Check the following connectors:
D-222, E-13, E-122, E-121
Does the speedometer operate normally?
Check the trouble symptoms.
Check the harness wire between J/B and SC-ECU.
Code No. 53 Wheel speed sensor system (open circuit
or short-circuit)Probable cause
This code is output when the open circuit or short-circuit detection carried out by
the ABS-ECU hardware circuit detects that there is an open circuit or
short-circuit in the (+) or ( - ) wire in one of the four wheel speed sensors and
signals are consequently not being input.DMalfunction of wheel speed sensor
DMalfunction of harness or connector
DMalfunction of the ABS-ECU
OK
NG
Check the trouble symptoms.
Replace the ABS-ECU
OK
NG
Check the harness wire between the SC-ECU and the
ABS-ECU
Check the trouble symptoms.
NG NG
YES
NOCheck the ABS system (Refer to Basic Manual GROUP 35B -
ABS.)
Check the following connectors:
E-106, E-122, E-120
Does the ABS system operate normally?
Measure at ABS-ECU connectors E-106.
DDisconnect the connector and measure at the harness
side.
DIgnition switch: ON
DVoltage between terminal 11 and body earth
OK:
4.8 - 5.2 V
RepairNG
OK
NG
Replace the SC-ECU
Check the trouble symptoms.RepairNG


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk

MITSUBISHI SC-Troubleshooting13E-15
DATA LIST REFERENCE TABLE
The following ECU input data items can be read using the MUT-
II.
Item
No.Check itemInspection conditionsNormal condition
10Vehicle speedWhen vehicle is being drivenSpeedometer display and
MUT-IIdisplay are identical.
11AcceleratorIgnition switch:Release the accelerator pedal.0.9 - 1.1 V
pedal position
sensorONDepress the accelerator pedal gradually.Increases in response to
pedal depression stroke.
Depress the accelerator pedal fully4.0 V or more
18Power supply
voltageIgnition switch: ONSystem voltage
19Accelerator
pedal positionIgnition switch:
ONRelease the accelerator pedalON
pedal position
switch (Idle
switch)ON
Depress the accelerator pedal slightly.OFF
20Ignition switchIgnition switch: ONON
Ignition switch: OFFOFF
22Front-right
wheel speedWhen vehicle is being drivenSpeedometer display and
MUT-IIdisplay are identical.
28Engine typeVehicles with the 6G74 engine6G74
Vehicles with the 4M41 engine4M41
30Trace controlSC system control is activeON
SC system control is not activeOFF
31Engine specifi-Vehicles with the 6G74 engineDOHC
cation 1Vehicles with the 4M41 engine-
32Engine specifi-Vehicles with the 6G74 engineN/A
cation 2Vehicles with the 4M41 engine-
33Engine specifi-Vehicles with the 6G74 engineMIVEC/ETV
cation 3Vehicles with the 4M41 engine-
35Destination-EC
40Engine speedDepress the accelerator pedal gradually.Tachometer display and
MUT-IIdisplay are identical.
51Inhibitor switchIgnition switch:Selector lever position: PP
ONSelector lever position: RREngine:
stopped
Selector lever position: NN
Selector lever position: DD
52Shift positionSelector lever
position: sportsDriving at a constant speed of 10 km/h in
1st1st
modeDriving 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


www.WorkshopManuals.co.uk


Purchased from www.WorkshopManuals.co.uk