2000 MITSUBISHI MONTERO Service Repair Manual

GDI -Troubleshooting 13A-163
Code No.93 Throttle valve control servo systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DThrottle valve control servo relay: ON
Set Conditions
DShort circuit of the throttle valve control servo drive circuit to earth
DPower is supplied to the throttle valve control servo circuit from other
sources.
DOpen circuit in the throttle valve control servo power supply circuitDMalfunction of the throttle valve control servo
DOpen circuit in the throttle valve control servo
power supply circuit
DOpen or short circuit in the throttle valve control
servo circuit or loose connector contact
DMalfunction of throttle valve controller
OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the following connector:
B-122NG
Repair
OK
Measure at the throttle valve control
servo connector B-122
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DThe voltage between terminal 1
and earth
DThe voltage between terminal 2
and earth
DThe Voltage between terminal 3
and earth
OK:
Voltage changes between 5
- 7 V when the accelerator
pedal is operated.
NOTE: Erase the diagnosis code
before the measurement
since a diagnosis code is
recorded when the harness
is disconnected.NGCheck the following connector:
D-11NG
Repair
OK
Check the trouble symptoms.
OK
Check the trouble symptoms.
OK
Check the harness wire between the
throttle valve control servo and the
throttle valve controller.NG
Repair
NG
Check the throttle valve control
servo. (Refer to P.13A-232.)NGReplace the throttle body assembly
NG
Replace the throttle valve controller.
NG
Replace the throttle valve controller.
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Check the operation of the throttle
valve control servo.
OK:
The throttle valve opens or
closes when the accelerator
pedal is depressed or released.


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GDI -Troubleshooting 13A-164
Code No.94 Communication line system with the throttle
valve controllerProbable cause
Range of Check
DIgnition switch: ON
DBattery voltage: 8 V or more.
DEngine: not cranking
Set Conditions
DSystem detects an error in communicationline between the engine-A/T-ECU
and the throttle valve controller, and between the throttle valve controller and
the engine-A/T-ECU.DShort in communicationline
DMalfunction of engine-A/T-ECU
DMalfunction of throttle valve controller
MUT-
IISelf-Diag Code
Is Code No.91 output?YESRefer to Code No.91, Electronic-con-
trolled throttle valve system (Refer to
P13A-161.)
NO
NG
Repair
OK
Measure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
(1) The voltage between terminal 5
and earth
OK:
System voltage
(2) The voltage between terminal 22
and earth
OK:
System voltage
(3) The voltage between terminal 3
and earth
The voltage between terminal 4
and earth
The voltage between terminal 16
and earth
OK:
0.5 V or less(1) NGCheck the following connectors:
B-25X,
D-128NG
Repair
Check the trouble symptoms.OK
Check the harness wire between the
throttle valve controller and theengine
control relay, and repair if necessary.
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
(2) NGCheck the following connectors:
D-208,
D-223, E-13NG
Repair
OK
Check the harness wire between the
throttle valve controller and the ignition
switch, and repair if necessary.
(3) NGCheck the following connector:
D-14NG
Repair
OK
Check the harness wire between the
throttle valve controller and earth, and
repair if necessary.
OK
Check the following connectors:
D-119, D-122NG
Repair
OK
Check the harness wire between the
throttle valve controller and the
engine-A/T-ECU.NG
Repair
NG
Replace the throttle valve controller.
Check the following connector:
D-11


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GDI -Troubleshooting 13A-165
Code No.96 Throttle valve controller systemProbable cause
Set Conditions
DErrors in reading or writing to the throttle valve controller ROM.DMalfunction of the throttle valve controller
Replace the throttle valve controller.


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GDI -Troubleshooting 13A-166
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspection
procedure
No.Reference page
CommunicationCommunication with all systems is not possible.113A-169
with MUT-IIis
impossible.
Communication with engine-A/T-ECU only is not possible.213A-169
Engine warning
lamp andThe engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.313A-170
related parts
The engine warning lamp remains illuminating and never goes
out.413A-170
StartingNo initial combustion (starting impossible)513A-171
Initial combustion but no complete combustion
(starting impossible)613A-172
Long time to start (improper starting)
Idling stabilityUnstable idling (Rough idling, hunting)713A-174
(Improper idling)
Idling speed is high. (Improper idling speed)813A-176
Idling speed is low. (Improper idling speed)
Idling stabilityWhen the engine is cold, it stalls at idling. (Die out)913A-177
(Engine stalls)
When the engine is hot, it stalls at idling. (Die out)1013A-178
The engine stalls when starting the car. (Pass out)1113A-180
The engine stalls when decelerating.1213A-181
DrivingHesitation, sag or stumble1313A-182
Poor acceleration
Surge
The feeling of impact or vibration when accelerating1413A-183
The feeling of impact or vibration when decelerating1513A-184
Knocking1613A-184
Dieseling1713A-184
Too high CO and HC concentration when idling1813A-185
Low alternator output voltage (approx. 12.3 V)1913A-186
Engine idle speed is incorrect while the A/C is on (A/C switch 2 signal).2013A-187
Fans (radiator fan, A/C condenser fan) are inoperative2113A-187
GDI ECO indi-GDI ECO indicator lamp does not illuminate.2213A-188
cator lamp sys-
tem
GDI ECO indicator lamp remains illuminated and does not go off.2313A-188


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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-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 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 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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