battery MITSUBISHI MONTERO 2000 Service Owner's Manual

GDI -Troubleshooting 13A-85
Inspection procedure 10
When the engine is hot, it stalls at idling. (Die out)
Probable cause
The cause is probably an improper air/fuel ratio, faulty electronic-controlled throttle
valve system, compression pressure. In addition, if theenginestalls suddenly, another
possible causemight be a poorconnector contact.DMalfunction of the ignition system
DMalfunction of air/fuel ratio control system
DMalfunction of electronic-controlled throttle valve
system
DMalfunction of the throttle body
DPoor connector contact
DImproper compression pressure
DAir stuck in the air intake system
NG
Repair
Have the battery terminalsbeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye sRefer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle valve position feedback system. (Refer to
P.13A-65, code No. P1221.)
OK
Is it easy to reproduce theengine stall?NoWhile carrying out an intermittent malfunction simulation test. (Refer
to GROUP 00 - Points to Note for Intermittent Malfunction.), check
for sudden changes in the following signals.
DCrankanglesensor signal
DInjector drive signal
DFuel pump(low pressure) drive signal
DAir flow sensor
DPrimary ignition signal
DPower supply to the engine-ECU
Ye s
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-105.)NGCheck the acceleratorpedal positionswitch. (Refer to P.13A-100,
Inspection procedure 28.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-105.)NGCheck the intake air temperature sensor. (Refer to P.13A-21, code
No. P0110.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-105.)NGCheck the barometric pressure sensor. (Refer to P.13A-19, code
No. P0105.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-105.)NGCheck theengine coolant temperaturesensor. (Refer to P.13A-22,
code No. P0115.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
OK:
600 - 1,000 mV when theengine is suddenlyracedNGCheck the oxygen sensor (front) system. (Refer to P.13A-28, code
No. P0130.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
OK:
0 - 400 mV and 600 - 1,000 mV alternates when the
engine is idling(wait for four minutes after theengine
started).NGMeasure fuel high-pressure between the fuel pump (highpressure)
and injector. (Refer to P.13A-224.)
OK
Check that air is sucked in the air intake system.
DBroken intakemanifoldgasket
DDamaged vacuum hose
DDamaged air intake hoseOK
To the nextpage
OK
MUT-
IIData list
59 Oxygen sensor (rear)
DTransmission: 2nd gear
DDriving with throttle widelyopen
OK:
600 - 1,000 mVNGCheck the oxygen sensor (rear) system. (Refer to P.13A-31, code
No. P0136.)


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GDI -Troubleshooting 13A-88
Inspection procedure 12
The engine stalls when decelerating.
Probable cause
The cause is probably an improper air/fuel ratio due to a faulty EGR system, or poor
intake air volume due to a faulty electronic-controlled throttle valve system.DMalfunction of the electronic-controlled throttle valve
system
DMalfunction of the EGR valve
Have the battery terminalsbeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
No
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-105.)NGCheck the acceleratorpedal positionswitch. (Refer to P.13A-100,
Inspection procedure 28.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle valve position feedback system. (Refer to
P.13A-65, code No. P1221.)
OK
MUT-
IIData list
68 EGR valve (Refer to P.13A-105.)NGCheck the EGR valve system. (Refer to P.13A-69, code No. P0403.)
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
DClean around the throttle valve (Refer to P.13A-220.)


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GDI -Troubleshooting 13A-98
Inspection procedure 25
Engine-ECU power supply and earth circuit system
Probable cause
The cause is probably a malfunction of the engine-ECU or one of the problems
listed at right.DOpen circuit or short-circuited harness wire in the
engine-ECU power supply circuit
DOpen circuit or short-circuited harness wire in the
engine-ECU earth circuit
DMalfunction of the engine-ECU
NG
RepairOK
Check the ignition switch. (Refer to
GROUP 54.)
(2), (3) NGCheck the harness wire between the
engine-ECU and engine controlrelay,
and repair if necessary.
(4) NG
Check the harness wire between the
engine-ECU and earth, and repair if nec-
essary.
(5) NG
NG
Repair
OK
Check the trouble symptoms.NGCheck the harness wire between the
engine-ECU and the battery, and repair
if necessary.
NG
Repair
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connectors:
D-117, D-118
Check the following connectors:
D-27, D-31 , E-13OK
Check the trouble symptoms.NGCheck the harness wire between the
engine-ECU and ignition switch, and re-
pair if necessary.
Measure at the engine-ECU connectors
D-117, D-118.
DDisconnect the connector, and
measure at the harness side.
(1) Voltage between 99 and earth
(Ignition switch: ON)
OK:
System voltage
(2) Voltage between 57 and earth
OK:
System voltage
(3) Voltage between 47, 59 and
earth (Ignition switch: ON)
OK:
System voltage (When ter-
minal 57 is shorted to
earth)
(4) Continuity between 46, 58 and
earth
OK:
Continuity
(5) Voltage between 60 and earth
OK:
System voltage(1) NGCheck the following connector:
D-208, D-223, E-13NG
Repair
Check the following connector:
D-14NG
Repair
Check the trouble symptoms.OK
NG


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GDI -Troubleshooting 13A-99
Inspection procedure 26
Engine control relay and ignition switch-IG system
Probable cause
When the ignition switch ON signal is input to the engine-ECU, the engine-ECU
turns on theengine controlrelay.
This causes system voltage to be supplied to the engine-ECU and to the
sensors and actuators.DMalfunction of the ignition switch
DMalfunction of the engine controlrelay
DOpen circuit or short-circuited harness wire of the
engine controlrelay circuit
DMalfunction of the engine-ECU
OK
Check the trouble symptoms.NGCheck the harness wire between the
battery and theengine controlrelay, and
repair if necessary.
OK
Check the engine-ECU power supply
and earth circuit system. (Refer to
P.13A-98, Inspection procedure 25.)
OK
Measure at the engine controlrelay con-
nector B-25X.
DDisconnect the connector, and
measure at the harness side.
DVoltage between 2, 3 and earth
OK:
System voltageNGCheck the following connector:
D-143NG
Repair
Check theengine controlrelay. (Refer
to P.13A-227.)NG
Replace
Inspection procedure 27
Ignition switch-ST system
Probable cause
The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine iscranking.
The engine-ECU uses this signal to carry out functions such as fuel injection
control during starting.DMalfunction of the ignition switch
DOpen circuit or short-circuited harness wire of the
ignition switch circuit
DMalfunction of the engine-ECU
NG
RepairOK
Check the ignition switch. (Refer to
GROUP 54.)
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connector:
D-117NG
RepairOK
Check the trouble symptoms.NGCheck the harness wire between the
engine-ECU and the ignition switch.
Measure at the engine-ECU connector
D-117.
DDisconnect the connector, and
measure at the harness side.
DVoltage between 68 and earth
(Ignition switch: START)
OK:
8 V or moreNGCheck the following connectors:
C-01, E-113, E-114NG
Repair


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GDI -Troubleshooting 13A-103
Inspection procedure 32
Stop lamp switch system
Probable cause
The engine-ECU determines whether the brakepedal is depressed or not, by means
of the stoplampswitch input signal.DMalfunction of the stoplampswitch
DOpen circuit or short-circuited harness wire in the stop
lampcircuit, or poor connector contact
DMalfunction of the engine-ECU
NG
NG
NG
Repair
Check the stoplampswitch. (Refer to GROUP 35 - Brake Pedal.)NG
Replace
OK
Measure at stoplampswitch connector D-136.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 2 and earth
OK:
System voltageNG
OK
Check trouble symptom.
Check the harness wire between the battery and stoplampswitch.
NG
Repair
OK
Measure at engine-ECU connector D-117.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 63 and earth
(Ignition switch: ON)
OK:
0 - 3 V (when the brakepedal is not depressed)
System voltage (when the brakepedal is depressed)NG
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and stoplamp,
and repair if necessary.
OK
Check the following connector:
D-117NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
Check the following connectors:
D-26 , D-27, D-124

Check the following connectors:
D-26 , D-124 ,
D-128, E-13


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GDI -Troubleshooting 13A-145
Code No.25 Barometric pressure sensor systemProbable cause
Range of Check
DTwo seconds have passed since the ignition switch is turned ON or the
engine startingprocess is completed.
DBattery voltage: 8 V or more
Set Conditions
DThe sensor output voltage is 4.5 V or more for four seconds (equivalent to
114 kPa of barometric pressure)
or
DThe sensor output voltage is 0.2 V or less (equivalent to 53 kPa of
barometric pressure)DMalfunction of barometric pressure sensor
DOpen or short circuit in barometric pressure
sensor circuit or loose connector contact
DMalfunction of engine-A/T-ECU
(2) NGCheck the following connector:
D-121NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
MUT-
IIData list
25 Barometric pressure sensor
(Refer to P.13A-198, DATA LIST
REFERENCE TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
Repair
OK
Measure at air flow sensor connector
B-120.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth (Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Resistance between terminal 5
and earth
OK:
2Wor less(1) NGMeasure at engine-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 87 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-121
NG
Repair
NG
Check the following connector:
D-121NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Measure at air flow sensor connector
B-120.
DConnect connector terminals
No.1, No.2 and No.5 only by
using test harness (MB991709),
and measure at the pick - up
harness.
DIgnition switch: ON
(1) Voltage between terminal 1 and
earth
OK:
4.8 - 5.2 V
(2) Voltage between terminal 2 and
earth
OK:
Altitude 0 m: 3.7 - 4.3 V
Altitude 1200 m:
3.2 - 3.8 V
(3) Voltage between terminal 5 and
earth
OK:
0.5 V or less(1) NGCheck the following connector:
D-121NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
OK
To the nextpage(3) NG
(2) NG
Replace the air flow sensor.
NG
Check the following connector:
D-120NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
Check the following connector:
B-120
Check the trouble symptoms.


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GDI -Troubleshooting 13A-147
Code No.41 Injector systemProbable cause
Range of Check
DThe enginespeed is 4,000 r/min or less.
DThe battery voltage is 10 V or more.
DThe fuel cut operation or the injector operation (by carrying out the Actuator
Test) is not in progress.
Set Conditions
DThe injector driver is not transmitting a injectoropencircuit check signal for
four seconds.DMalfunction of injector
DOpen or short circuit in the injector circuit or loose
connector contact
DMalfunction of engine-A/T-ECU
NG
Check the following connector:
B-105NG
Repair
OK
NG
Repair
MUT-
IIActuator Test
01 No.1 injector
02 No.2 injector
03 No.3 injector
04 No.4 injector
05 No.5 injector
06 No.6 injector
OK:
The idling condition should
change.OKCheck the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the injector driver.
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Measure at intermediate connector
B-105.
DDisconnect the connector and
measure at the harness side.
DResistance between terminals 11
and 12
Resistance between terminals 5
and 6
Resistance between terminals 9
and 10
Resistance between terminals 3
and 4
Resistance between terminals 7
and 8
Resistance between terminals 1
and 2
OK:
0.9 - 1.1WNGCheck the following connectors:
B-117 , B-114 injector>, B-118 ,
B-115 , B-103 injector>, B-104 NG
Repair
OK
Replace the injector.
Check the following connector:
B-121NG
Repair
OK
Check the harness wire between the
injector driver and the intermediate
connector.NG
Repair
OK
Check the following connector:
D-119NG
Repair
OK
Check the harness wire between the
injector driver and the
engine-A/T-ECU.NG
Repair
OK
To the nextpage
Check the harness wire between
injector and the intermediate
connector.
OK


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GDI -Troubleshooting 13A-162
Code No.92 Throttle valve position feedback systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DIgnition switch: ON
DBattery voltage: 10 V or more
Set Conditions
DFailure in the position feedback
[The engine-A/T-ECU detects that the current in the motor isexcessive and
the opening angle difference between the targetvalue of throttle position
sensor (1st channel) and the actual value of throttle position sensor (1st
channel) is 2.0V or more]DMalfunction of throttle position sensor (1st channel)
DOpen or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
DMalfunction of the throttle valve controller
NG
Replace the throttle valve controller.
OK
Check the trouble symptoms.
NG
Check the harness wires between the throttle position sensor
and the throttle valve controller, and between the throttle valve
control servo and the throttle valve controller.NG
Repair
NO
Adjust the throttle position sensor. (Refer to P.13A-220.)
MUT-
IISelf-Diag Code
Is code No.79 set?YESRefer to Code No.79, Throttle position sensor (1st channel)
system. (Refer to P.13A-158.)
NO
MUT-
IISelf-Diag Code
Is Code No.93 set?YESRefer to Code No.93, Throttle valve control servo system
(Refer to P.13A-163.)
OK
Check the following connectors:
B-102, B-122, D-11NG
Repair
OK
Check the throttle valve control servo. (Refer to 13A-232.)NGReplace the throttle body assembly.


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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-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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