2000 MITSUBISHI MONTERO check engine

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-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-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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GDI -Troubleshooting 13A-75
Inspection procedure 2
MUT-II
communication with engine-ECU is impossible.
Probable cause
One of the following causes may be suspected.
DNo power supply to engine-ECU.
DDefective earth circuit of engine-ECU.
DDefective engine-ECU.
DImproper communication line between engine-ECU and MUT-IIDMalfunction of engine-ECU power supply circuit
DMalfunction of engine-ECU
DOpen circuit between the engine-ECU and diagnosis
connector
NG
Check the harness wire between engine-ECU and diagnosis con-
nector.NG
Repair
OK
Check trouble symptom.
Check the following connectors:
D-06, D-23, D-33, D-118, D-128, D-222, E-13NG
Repair
OK
Check the engine-ECU power supply and earth circuit system.
(Refer to P.13A-98, Inspection procedure 25.)
NOTE
On vehicles with center display, if a malfunction cannot be resolved after the procedure above, check the center
display and replace if necessary. (Refer to GROUP 54 - Center display.)


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GDI -Troubleshooting 13A-76
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-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 ignitionswitch
is turned to ON, one of the malfunctions listed at right has probably occurred.DBurnt-out bulb
DDefective warninglampcircuit
DMalfunction of the engine-ECU
MUT-
IIData list
16 engine-ECU power supply voltage (Refer to P.13A-105.)NGCheck the engine-ECU power supply and earth circuit system.
(Refer to P.13A-98, Inspection procedure 25.)
OK
Measure at the engine-ECU connector D-116.
DDisconnect the connector, and measure at the harness side.
DEarth the terminal No. 31.
OK:
The engine warning lamp illuminates.OKCheck the following
connector:
D-116NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
NG
Check a burnt-out bulb.NG
Replace
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:
System voltageNGCheck theengine warning lamppower supply circuit, and repair
if necessary.
OK
Check the following connectors:
D-02, D-116, E-13NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between combination meter and engine-
ECU, and repair if necessary.
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-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-ECU
DMalfunction of the engine-ECU
MUT-
IISelf-Diag code
Are diagnosis codes displayed?Ye sRefer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES
No
Measure at the combination meter connector D-02.
DDisconnect the connector, and measure at the harness side.
DDisconnect the engine-ECU connector
DContinuity between 38 and earth
OK:
No continuityNGCheck the harness wire between combination meter and engine-
ECU connector, and repair if necessary.
OK
Replace the engine-ECU.


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GDI -Troubleshooting 13A-77
Inspection procedure 5
No initial combustion (starting impossible)
Probable cause
This is caused by incorrect fuel supply into the combustion chamber, and improper
ignition circuit. Besides that, foreign material may be contaminated in fuel.DMalfunction of the fuel supply system
DMalfunction of the ignition system
DMalfunction of the engine-ECU
Check system voltage while theengine iscranking.
OK:
8 V or moreNGCheck the battery. (Refer to GROUP 55 - Battery.)
OK
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye sRefer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
MUT-
IIData list
16 System voltage (Refer to P.13A-105.)NGCheck theengine controlrelay and ignition switch-IG system. (Refer
to P.13A-99, Inspection procedure 26.)
OK
Does the camshaft rotate when theengine is cranking?NoCheck if thetiming belt isbroken ordamaged.
Ye s
MUT-
IIActuator test
07 Fuel pump(low pressure) (Refer to P.13A-110.)NGCheck the fuelpump(low pressure) system. (Refer to P.13A-101,
Inspection procedure 29.)
OK
MUT-
IIData list
22 Crankanglesensor (Refer to P.13A-105.)NGCheck the crankanglesensor system. (Refer to P.13A-56, code
No. P0335.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-105.)NGCheck theengine coolant temperaturesensor system. (Refer to
P.13A-22, code No. P0115.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle position sensor (1st channel) system. (Refer
to P.13A-25, code No. P0120.)
OK
Inspectenginestart ability by cranking theengine while theaccelera-
tor pedal isslightly depressed.OKClean around the throttle valve. (Refer to P.13A-220.)
NG
Check fuel leakage. (Refer to P.13A-225.)NG
Repair
OK
Measure low fuel pressure between the fuelpump(low pressure)
and fuel pump (highpressure). (Refer to P.13A-222.)NG
Repair
OK
Measure at ignition coil connectors B-101, B-108, B-112, B-113,
B-116, B-119.
DConnect the connector.
DConnect atiming light to theNo.1 terminal of each connector
in turn.
(Engine cranking)
OK:
The timing lightflashes.NGCheck the ignition coil (incorporating power transitor) system. (Refer
to P.13A-53, code No. P0300.)
OK
Check ignitiontiming while the engine iscranking.
OK:
Approx. 5_BTDCNGCheck that the crankanglesensor andtiming beltcover are properly
installed.
OK
To the nextpage
Measure at injector driver connector B-121.
DDisconnect the connector, and measure at the connector side.
DVoltage between each of terminals 4, 12, 21 and earth
(Ignition switch: ON)
OK:
System voltageCheck the injector driver system. (Refer to P.13A-104, Inspection
procedure 34.) NG
OK


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GDI -Troubleshooting 13A-78
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 iscranked.NGReplace the ignition coil.
OK
Check all the following items:
DSparkplug
DCompression pressure
DForeign material (such as water or kerosine) entered the fuel
lines
Check trouble symptom.OKNGReplace the injector.
From the previouspage


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