MITSUBISHI MONTERO 2000 Service Repair Manual

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 <A/T>13A-168
ItemsSymptom
DrivingShockThe feeling of a comparatively large impact or vibration when the engine is
accelerated or decelerated.
SurgeThis is repeated surging ahead during constant speed travel or during variable
speed travel.
KnockingA sharp sound like a hammer striking the cylinder walls during driving and which
adversely affects driving.
StoppingRun on
(“Dieseling”)The condition in which the engine continues to run after the ignition switch is
turned to OFF. Also called “Dieseling”.


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GDI -Troubleshooting <A/T>13A-169
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection procedure 1
Communication with all systems is not possible.
Probable cause
The cause is probably a defect in the power supply system (including earth) for
the diagnosis line.DMalfunction of the diagnosis connector
DOpen circuit or short-circuited between
engine-A/T-ECU and diagnosis connector circuit
DMalfunction of the MUT-II
Check the earth line, and repair if
necessary.
(2) NG
Replace the MUT-II.
NG
Check the harness wire between the
power supply and diagnosis
connector, and repair if necessary.
OK
Check the trouble symptoms.NG
Repair
(1) NGCheck the following connectors:
D-27, D-210, D-211
OK
NG
RepairOK
Check the harness wire between
diagnosis connector and the
engine-A/T-ECU.
Measure at the diagnosis connecter
D-23.
(1) The voltage between terminal 16
and earth
OK:
Battery voltage
(2) Continuity between 4 and earth
Continuity between 5 and earth
OK:
Continuity
Inspection procedure 2
Communication with engine-A/T-ECU is not possible.
Probable cause
The cause is probably a defect in the engine-A/T-ECU power supply circuit
(including earth).DOpen circuit or short-circuited harness wire in the
engine-A/T-ECU power supply circuit.
DOpen circuit between engine-A/T-ECU and
diagnosis connector
DMalfunction of the engine-A/T-ECU
NG
Check the harness wire between engine-A/T-ECU and
diagnosis connector.OKCheck the engine-A/T-ECU power supply and earth circuit.
(Refer to P. 13A-189, Inspection procedure 24.)
OK
Check the trouble symptoms.
Check the following connectors:
D-06, D-23, D-122, D - 128,
D-222, E-13NG
Repair
NOTE
On vehicles with multi communication system (MMCS) or RV meter, if a malfunctioncannot be resolved
after the procedure above, check the multi center display unit or RV meter and replace if necessary.
(Refer to GROUP 54 - Clock, multi center display and RV meter.)


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GDI -Troubleshooting <A/T>13A-170
Inspection procedure 3
The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position.
Probable cause
Because there is a burnt-out bulb, the engine-A/T-ECU causes theengine
warning lamp to illuminate forfive seconds immediately after the ignition switch
is turned to ON.
If the engine warning lampdoes notilluminate immediately after the ignition
switch is turned to ON, one of the malfunction listed at right has probably
occurred.DBurnt-out bulb
DOpen circuit or short-circuit between theengine
warning lamp and engine-A/T-ECU.
DMalfunction of the engine-A/T-ECU
NG
Replace the engine-A/T-ECU.
NG
Check the harness wire between
combination meter and
engine-A/T-ECU connector, and
repair if necessary.NG
Check theengine warning lamp
power supply circuit, and repair if
necessary.
OK
Check the trouble symptoms.
OK
Measure at the combination meter
connector D-01.
DDisconnect the connector, and
measure at the harness side.
DVoltage between 62 and earth
(Ignition switch: ON)
OK:
Battery voltageOKCheck the following connectors:
D-02, D-119, E-13NG
Repair
NG
Check a burnt-out bulb.NG
Replace
OK
Check the trouble symptoms.
OK
Measure at the engine-A/T-ECU
connector D-119.
DDisconnect the connector, and
measure at the harness side.
DEarth the terminal 22
(Ignition switch: ON)
OK:
Engine warning lamp illumi-
nates.OKCheck the following connector:
D-119NG
Repair
MUT-
IIData list
16 Engine-A/T-ECU power supply
voltage
(Refer to P.13A-198.)NGCheck the engine-A/T-ECU power
supply and earth circuit (Refer to
P.13A-189, Inspection procedure 24.)
Inspection procedure 4
The engine warning lamp remains illuminating and
never goes out.
Probable cause
In cases such as the above, the cause is probably that the engine-A/T-ECU is
detecting a problem in a sensor or actuator, or that one of the malfunctions
listed at right has occurred.DShort-circuit between the engine warning lamp and
engine-A/T-ECU
DMalfunction of the engine-A/T-ECU
Replace the engine-A/T-ECU.
NO
Measure at the combination connector D-02.
DDisconnect the connector, and measure at the harness
side.
DDisconnect the engine-A/T-ECU connector
DContinuity between 38 and earth
OK:
No continuityNGCheck the harness wire between combination meter and
engine-A/T-ECU connector, and repair if necessary.
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.


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GDI -Troubleshooting <A/T>13A-171
Inspection procedure 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a sparkplug is
defective, or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.DMalfunction of the fuel supply system
DMalfunction of the ignition system
DMalfunction of the engine-A/T-ECU
NGRepair
OK
MUT-
IIData list
22 Crankanglesensor (Refer to P.13A-198.)NGCheck the crankanglesensor system.
(Refer to P.13A-140, code No.22.)
YES
MUT-
IIActuator Test
07 Fuel pump(low pressure) (Refer to P.13A-203.)NGCheck fuelpump(low pressure) system
(Refer to P.13A-193, Inspection procedure 29.)
OK
Does the camshaft rotate when theengine is cranking?NOCheck if thetiming belt isbroken ordamaged.
NO
MUT-
IIData list
16 Battery voltage (Refer to P.13A-198.)NGCheck theengine controlrelay and ignition switch-IG system
(Refer to P.13A-190, Inspection procedure 25.)
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES
Check battery voltage when cranking.
OK:
8 V or higherNGCheck the battery.
OK
Is starting good if the engine iscranked with the accelerator
pedalslightly depressed?YESDClean the throttle valve area. (Refer to P.13A-220.)
DCheck and adjust the throttle position sensor (Refer to
P.13A-220.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle position sensor (1st channel) system
(Refer to P.13A-158, code No.79.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system
(Refer to P.13A-138, code No.21.)
OK
Measure low fuel pressure between the fuelpump(low
pressure) and fuelpump (highpressure) (Refer to P.13A-222.)NGRepair
OK
To the nextpage
NO
Adjust the throttle position sensor (Refer to P.13A-220.)
NG
Measure at injector driver connector B-19
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminals 4, 12, 21 and earth
(Ignition switch: ON)
OK
Battery voltage
Check fuel leakage (Refer to P.13A-225.)OK
Check the injector driver system.
(Refer to P.13A-196, Inspection procedure 34.) NG


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GDI -Troubleshooting <A/T>13A-172
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck if foreign materials (water, alcohol, etc.) got into
fuel.
OK
Clamp the leads of the ignition coil No.1 terminal with atiming
light pick-up in order. Does thetiming lightflash when the
engine iscranked?NOCheck the ignition coil (built-in power transistor) system (Refer
to P.13A-148, code No.44.)
From the previouspage
OK
Check the trouble symptoms.
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
3. Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine is
cranked.NGReplace the ignition coil.
YES
Check the ignitiontimingwhen cranking.
OK:
approx. 5_BTDCNGCheck that the crankanglesensor andtiming beltcover are
properly installed.
Replace the injector.NG
Inspection procedure 6
Initial combustion but no complete combustion (starting
impossible), long time to start (hard starting)
Probable cause
In such cases as the above, the cause is probably that the spark plugs are
generating sparks by the spark are weak, or the initial mixture is not appropriate.DMalfunction of fuel supply system
DMalfunction of of fuel pressure control solenoid
valve
DMalfunction of the ignition system
DMalfunction of the electronic-controlled throttle
valve system
DMalfunction of the engine-A/T-ECU
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer
to P.13A-138, code No.21.)
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
Check the battery voltage when cranking.
OK:
8 V or higherNGCheck the battery.
NO
MUT-
IIActuator Test
07 Fuel pump(low pressure) (Refer to P.13A-203.)NGCheck fuelpumpsystem (low-pressure)
(Refer to P.13A-193, Inspection procedure 29.)
OK
To the nextpage


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GDI -Troubleshooting <A/T>13A-173
NGReplace the injector.Check the trouble symptoms.
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck the fuel lines for clogging.
DCheck if foreign materials (water, alcohol, etc.) got into
fuel.
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
3. Disconnect the injector intermediate connector.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine is
cranked.NGReplace the ignition coil.
Check the ignitiontimingwhen cranking.
OK:
Approx. 5_BTDCNGCheck that the crankanglesensor andtiming beltcover are
installed properly.
NO
Adjust the throttle position sensor (Refer to P.13A-220.)
OK
Is starting good if the engine iscranked with the accelerator
pedalslightly depressed?YESDClean the throttle valve area. (Refer to P.13A-220)
DAdjust the throttle position sensor
(Refer to P.13A-220.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system.
(Refer to P.13A-162, code No.92.)
OK
Check fuel leakage. (Refer to P.13A-225.)NGRepair
OK
MUT-
IIActuator Test
74 Fuel pressure sensor (Refer to P.13A-203.)NGCheck abnormal fuel pressure.
(Refer to P.13A-151, code No.56.)
OK
MUT-
IIData list
18 Cranking signal (Refer to P.13A-198.)NGCheck the ignition switch-ST system and inhibitor switch
(Refer to 13A-191, Inspection procedure 27.)
From the previouspage


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GDI -Troubleshooting <A/T>13A-174
Inspection procedure 7
Unstable idling (Rough idling, hunting)
Probable cause
The cause is probably a malfunction of the ignition system, air/fuel ratio control
system, electronic controlled throttle valve system, compression pressure, etc. As
many causes can be suspected, diagnose from easier items.DMalfunction of the ignition system
DMalfunction of the air/fuel ratio control system
DMalfunction of the electronic-controlled throttle
valve system
DPoor compression
DAir sucking into the air intake system
OK
Check that air is sucked in the air intake system.
DBroken intake manifold gasket
DDamaged vacuum hose
DDamaged air intake hoseOK
To the nextpage
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
0 - 400 mV and 600 - 1,000 mV alternates when
the engine is idling(wait for 2 minutes after the en-
gine is started).NGMeasure fuel high-pressure between the fuel pump (high
pressure) and injector. (Refer to P.13A-222.)
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
600 - 1,000 mV when theengine is suddenlyracedNG11 Oxygen sensor system check
(Refer to P. 13A-131, code No.11.)
OK
MUT-
IIActuator Test
08 Purge control solenoid valve (Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer
to P.13A-138, code No.21.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system (Refer to
P.13A-145, code No.25.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system (Refer to
P.13A-135, code No.13.)
NO
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system (Refer to
P.13A-192, Inspection procedure 28.)
OK
Does theidlingspeed fluctuate excessively?YESDClean around the throttle valve. (Refer to P.13A-220)
DAdjust the throttle position sensor (Refer to P.13A-220.)
NO
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system
(Refer to P.13A-162, code No.92.)
NO
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes.


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GDI -Troubleshooting <A/T>13A-175
OK
NG
Air is sucked in the air intake system, or EGR gas leaks.
DBroken intake manifold gasket
DDamaged air intake hose
DDamaged vacuum hose
DFaulty EGR valve seat
Check the trouble symptoms.
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the exhaust gas emission control system
DCheck the EGR control system
DCheck the compression pressure
DCheck if foreign materials (water, kerosine,etc.) got into
fuel.
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
3. Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine is
cranked.NGReplace the ignition coil.
Clean around the throttle valve. (Refer to P.13A-220.)
OK
Check the ignition timing. (Refer to GROUP 11A - Engine
Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are
properly installed.
OK
MUT-
IIData list
68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
OK
MUT-
IIData list
14 Throttle position sensor (2nd channel)
After warming-up, let theengine run at idlingwith no load.
OK:
When idling, 3,900 - 4,800 mVNGDClean around the throttle valve. (Refer to P.13A-220)
DAdjust the throttle position sensor (Refer to P.13A-220.)
OK
MUT-
IIData list
67 Stoplampswitch (Refer to P.13A-198.)NGCheck the stoplampswitch system
(Refer to P.13A-195, Inspection procedure 32.)
OK
MUT-
IIData list
28 A/C switch (Refer to P.13A-198.)NGCheck the A/C switch and A/C relay system
(Refer to P.13A-194, Inspection procedure 31.)
OK
MUT-
IIData list
27 Power steering oil pressure switch (Refer to P.13A-198.)NGCheck the power steering oil pressure switch system (Refer to
P.13A-194, Inspection procedure 30.)
From the previouspage
OK
MUT-
IIData list
31 Small lampswitch (Refer to P.13A-198.)NGCheck the smalllampswitch system
(Refer to P.13A-195, Inspection procedure 33.)


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GDI -Troubleshooting <A/T>13A-176
Inspection procedure 8
Idling speed is high or low (Improper idling speed)
Probable cause
The cause is probably that the intake airamount during idling is too great or too
small.DMalfunction of the electronic-controlled throttle
valve system
DMalfunction of the throttle body
OK
DClean around the throttle valve. (Refer to P.13A-220.)
DAdjust the throttle position sensor (Refer to P.13A-220.)
OK
MUT-
IIData list
67 Stoplampswitch (Refer to P.13A-198.)NGCheck the stoplampswitch system
(Refer to P.13A-195, Inspection procedure 32.)
OK
MUT-
IIData list
28 A/C switch (Refer to P.13A-198.)NGCheck the A/C switch and A/C relay system
(Refer to P.13A-194, Inspection procedure 31.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer
to P.13A-138, code No.21.)
OK
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system
(Refer to P.13A-192, Inspection procedure 28.)
OK
MUT-
IIActuator Test
08 Purge control solenoid valve (Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
NO
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system
(Refer to P.13A-162, code No.92.)


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