2000 MITSUBISHI MONTERO Service Repair Manual

GDI -Troubleshooting 13A-67
Code No.P1223 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-ECU and
the throttle valve controller, and between the throttle valve controller and the
engine-ECU.DShort in communicationline
DMalfunction of engine-ECU
DMalfunction of throttle valve controller
MUT-
IISelf-Diag Code
Is Code No.P1220 output?YESRefer to Code No.P1220,
Electronic-controlled throttle valve system
(Refer to P13A-64.)
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-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 connector:
D-118NG
Repair
OK
Check the harness wire between the
throttle valve controller and the
engine-ECU.NG
Repair
NG
Replace the throttle valve controller.
Check the following connector:
D-11


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GDI -Troubleshooting 13A-68
Code No.P1225 Accelerator pedal position sensor (2nd
channel) systemProbable cause
Range of Check
DAcceleratorpedal positionsensor (2nd channel) is normal.
DCommunication between the engine-ECU and the throttle valve controller is
normal.
Set Conditions
DOutput voltage of the accelerator pedal positionsensor (2nd channel) is 0.2
V or less for one second
or
DOutput voltage of the accelerator pedal positionsensor (1st channel) is 2.5 V
or less, and output voltage of the acceleratorpedal positionsensor (2nd
channel) is 4.5 V or more for one second.
or
DDifference between the accelerator pedal positionsensor (1st and 2nd
channels) output voltages exceeds 1.0 V (i.e. when the throttle valveopening
anglechanges slightly).DMalfunction of accelerator pedal positionsensor
(2nd channel)
DOpen or short circuit in acceleratorpedal position
sensor (2nd channel) circuit or loose connector
contact
DMalfunction of the throttle valve controller
DMalfunction of engine-ECU
OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the acceleratorpedal position
sensor (Refer to P.13A-229.)NG
Replace
OK
Measure at accelerator pedal position
sensor connector D-135
DDisconnect the connector and
measure at the harness side.
(1) The resistance between terminal
7 and earth
OK:
2Wor less
(2) The voltage between terminal 8
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NGCheck the following connector:
D-11NG
Repair
OK
Check the following connector:
D-135NG
Repair
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller.NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
(2) NGMeasure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DThe voltage between terminal 6
and earth
OK:
4.8 - 5.2 VOK
OK
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller, and repair if necessary.NG
Repair
NG
Check the following connector:
D-11NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller.NG
Repair
OK
To the nextpage
OK
Check the trouble symptoms.NGReplace the throttle valve controller. OK
MUT-
IIData list
77 Acceleratorpedal positionsensor
(2nd channel) (Refer to P.
13A-105, DATA LIST
REFERENCE TABLE.)
Check the following connector:
D-11


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GDI -Troubleshooting 13A-69
OK
Measure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DThe resistance between 20 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higherNGCheck the following connector:
D-11NG
Repair
NG
NG
Repair
OK
Check the trouble symptoms.
OK
Measure at accelerator pedal position
sensor connector D-135.
DUse test harness (MB991658) to
connect terminals No.6, No.7,
No.8 only, and measure at the
pick-up harness side.
DIgnition switch: ON
(1) The voltage between terminal 6
and earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higher
(2) The voltage between terminal 7
and earth
OK:
0.5 V or more
(3) The voltage between terminal 8
and earth
OK:
4.8 - 5.2 V(1) NGAdjust the acceleratorpedal position
sensor (Refer to P.13A-221).
From the previouspage
OK
Check the harness wire between
accelerator pedal positionsensor (2nd
channel) and the throttle valve controller,
and repair if necessary.
(2), (3) NGCheck the following connector:
D-11NGRepair
OK
Check the harness wire between
accelerator pedal positionsensor (2nd
channel) and the throttle valve controller,
and repair if necessary.
OK
Check the harness wire between
accelerator pedal positionsensor (2nd
channel) and the throttle valve controller,
and repair if necessary.
OKCheck the following connector:
D-11NGRepair
NG
Replace the throttle valve controller, and
repair if necessary.
Check the following connector:
D-11
Code No.P1226 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-70
Code No.P1500 Alternator FR terminal systemProbable cause
Range of Check
DEngine speed: 50 r/min or more
Set Conditions
DInput voltage from the alternator FR terminal is system voltage for 20
seconds.DOpen circuit in alternator FR terminal circuit
DMalfunction of engine-ECU
OK
Check the harness wire between the
intermediate connector and the
engine-ECU, and repair if necessary.NG
Repair
NG
Check the following connector:
D-117NG
Repair
Check the following connector:
B-41NG
Repair
OK
Measure at intermediate connector
B-41.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DEngine:idling (After warming up)
DRadiator fan: Not operating
DThe voltage between terminal 2
and earth
OK:
The voltage drops when
the headlamps are turned
on.NG
Check the following connector:
B-59NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-ECU.NG
Repair
OK
Measure at intermediate connector
B-41.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DThe voltage between terminal 2
and earth
OK:
9 - 10 VNGMeasure at engine-ECU connector
D-117.
DMeasure the voltage at the
engine-ECU terminal.
DIgnition switch: ON
DThe voltage between terminal 52
and earth
OK:
9 - 10 VNGCheck the following connector:
D-117
OK
NG
Repair
OK
Check the following connector:
D-117NG
Replace
OK
Check the trouble symptoms.NGReplace the engine-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-ECU.NG
Repair
NG
Replace the alternator.OK
Check the trouble symptoms.OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Check the harness wire between the
alternator and the intermediate
connector.


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GDI -Troubleshooting 13A-71
Cord No.P1610 Immobilizer systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DImproper communication between the engine-ECU and the immobilizer-ECUDOpen or short circuit, or loose connector contact
DMalfunction of the immobilizer-ECU
DMalfunction of the engine-ECU
NOTE
(1) If the registered ignition keys are close each other when starting the engine, radio interference may
cause this code to be displayed.
(2) This code may be displayed when registering the key encrypted code.
NG
Replace the engine-ECU.
Check the trouble symptoms.
NG
Replace the immobilizer-ECU
OK
Check the trouble symptoms.
OK
Check the harness wire between the
immobilizer-ECU and the
engine-ECU.NG
Replace
Check the following connectors:
D-118, D-202, E-13NG
Repair


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GDI -Troubleshooting 13A-72
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspection
procedure
No.Reference page
CommunicationCommunication with all systems is not possible.113A-74
with MUT-IIis
impossible.
Communication with engine-ECU only is not possible.213A-75
Engine warning
lamp andThe engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.313A-76
related parts
The engine warning lamp remains illuminating and never goes
out.413A-76
StartingNo initial combustion (starting impossible)513A-77
Initial combustion but no complete combustion
(starting impossible)613A-79
Long time to start (improper starting)
Idling stabilityUnstable idling (Rough idling, hunting)713A-81
(Improper idling)
Idling speed is high. (Improper idling speed)813A-83
Idling speed is low. (Improper idling speed)
Idling stabilityWhen the engine is cold, it stalls at idling. (Die out)913A-84
(Engine stalls)
When the engine is hot, it stalls at idling. (Die out)1013A-85
The engine stalls when starting the car. (Pass out)1113A-87
The engine stalls when decelerating.1213A-88
DrivingHesitation, sag or stumble1313A-89
Poor acceleration
Surge
The feeling of impact or vibration when accelerating1413A-90
The feeling of impact or vibration when decelerating1513A-91
Knocking1613A-91
Dieseling1713A-91
Too high CO and HC concentration when idling1813A-92
Low alternator output voltage (approx. 12.3 V)1913A-94
Engine idle speed is incorrect while the A/C is on.2013A-94
A/C condenser fan is inoperative2113A-95
Clutch switch system malfunction2213A-96
GDI ECO indi-GDI ECO indicator lamp does not illuminate.2313A-96
cator lamp sys-
tem
GDI ECO indicator lamp remains illuminated and does not go off.2413A-97


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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-74
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”.
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with MUT-II
is not possible.
(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 connector
DMalfunction of the harness wire
DMalfunction of MUT-
II
Measure at the diagnostic connector
(16-pin) D-23.
DVoltage between 16 and earth
OK:System voltageNGCheck the following connectors:
D-27, D-210, D-211NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
power supply and diagnostic connector
(16 pin), and repair if necessary.OK
Measure at the diagnostic connector
(16-pin) D-23.
DContinuity between 4 and earth
DContinuity between 5 and earth
OK:ContinuityNGCheck the harness wire between the
diagnostic connector (16-pin) and earth,
and repair if necessary.
OK
Replace the MUT-
II.


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