2000 MITSUBISHI MONTERO coolant

DIESEL FUEL <4M4> -Troubleshooting13C-6
FAIL-SAFE, BACKUP FUNCTIONS
When abnormalities in the major sensors are detected by diagnosis functions, pre-set control logic operates
to maintain a safe driving condition for the vehicle.
Diagnosis itemControl features in malfunction
Accelerator pedal position sensorD
Accelerator pedal released (idle switch ON)
Acceleration opening degree = 0%
D
Accelerator pedal applied (idle switchOFF)
Engine controlled at low speed
Acceleration opening degree = 20% fixed
Idle switchD
Void idling speed control.
D
Void cruise control.
Engine speed sensorD
Engine controlled at low speed
D
Void cruise control.
Boost air temperature sensorMaintain the intake air temperature at 50_
C.
Vehicle speed sensorD
Void idling speed control.
D
Void cruise control.
Engine coolant temperature sensorMaintain the engine coolant temperature at 80_
C.
Control sleeve position sensorD
Engine controlled at low speed
D
Void cruise control.
Timer piston position sensorD
Injection timing stabilizing control
D
Void cruise control.
Barometric pressure sensor (ECU
built-in)Keep the barometric pressure at 101 kPa.
Fuel temperature sensorMaintain the fuel temperature at 50_
C.
Boost pressure sensorKeep the boost pressure as barometric pressure (101 kPa).
Injection correction ROMVoid correction.
GE actuatorD
Engine controlled at low speed
D
Void cruise control.
Over boostVoid cruise control.
Timing control valveD
Injection timing stabilizing control
D
Void cruise control.


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DIESEL FUEL <4M4> -Troubleshooting13C-7
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference
page
11Accelerator pedal position sensor (main) system13C-8
12*Boost pressure sensor system13C-9
13Barometric pressure sensor (ECU built-in) system13C-10
14Fuel temperature sensor system13C-10
15Engine coolant temperature sensor system13C-11
16Boost air temperature sensor system13C-11
17Vehicle speed sensor system13C-12
18Engine speed sensor (backup) system13C-13
21Engine speed sensor system13C-14
23Idle switch (accelerator pedal position sensor built-in) system13C-15
25*Timer piston position sensor system13C-16
26*Control sleeve position sensor system13C-17
27Accelerator pedal position sensor (sub) system13C-18
41*Main throttle solenoid valve system13C-19
43Timing control valve system13C-20
46Injection correction ROM system13C-21
48*GE actuator (in the middle of control sleeve position sensor inoperative) system13C-21
49*Over boost (turbocharger waste gate malfunction)13C-22
54Immobilizer system13C-22
Caution
If the the above-mentioned diagnosis code number with the asterisks can be displayed along with
another code number in parentheses simultaneously, check the other code number before replacing
the engine-ECU.
12 (41, 49), 26 (48), 25 (43), 41 (12, 49), 48 (26), 49 (12, 41)


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DIESEL FUEL <4M4> -Troubleshooting13C-11
Code No. 15 Engine coolant temperature sensor systemProbable cause
Range of Check
DIgnition switch: ON, except for duringenginecranking
Set Conditions
DThe sensor output voltage for 3 seconds is 4.9V or higher (the coolant
temperature is approximately - 45_C or lower).
or
DThe sensor output voltage for 3 seconds is 0.2V or lower (the coolant
temperature is approximately 140_C or higher).DEngine coolant temperature sensor inoperative
DEngine coolant temperature sensoropencircuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
NGNG
Repair
OK
OKRepair
NGEngine coolant temperature sensor check
(Refer to P.13C-38.)
Replace the engine-ECU.NG
Replace the engine-ECU.OK NG
OK
Repair
Check the following connector:
B-36-3
NGCheck the trouble symptoms.NG
Measure at B-36-3 engine coolantsensor
connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:
4.5 - 5.5 V
DContinuity between 2 and the earth
OK:
ContinuityCheck the following connectors:
B-36, D-112, D-113
Check the harness between the
engine-ECU and the engine coolant
temperature sensor connector.
Check the trouble symptoms. Replace
Code No. 16 Boost air temperature sensor (intake air
sensor) systemProbable cause
Range of Check
DIgnition switch:ON, except for duringenginecranking
Set Conditions
DThe sensor output voltage for 3 seconds is 4.6V or higher (the coolant
temperature is approximately 45_C or lower).
or
DThe sensor output voltage for 3 seconds is 0.3V or lower (the coolant
temperature is approximately 110_C or higher).DBoost air temperature sensor inoperative
DBoost air temperature sensoropencircuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
Measure at B-49 boost air temperature
connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:
4.0 - 5.3 V
DContinuity between 2 and the earth
OK:
ContinuityNGCheck the following connectors:
D-112, D-113NG
Repair
OK
OKRepair
NGBoost air temperature sensor check
(Refer to P.13C-44.)
Check the trouble symptoms.
Replace the engine-ECU.NG
Replace the engine-ECU.OK NG
OK
Repair
Check the following connector:
B-49Replace
NGCheck the trouble symptoms.NG
Check the harness between the
engine-ECU and the boost air temperature
sensor connector.


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DIESEL FUEL <4M4> -Troubleshooting13C-20
Code No. 43 Timing control valve systemProbable cause
Range of Check
DEngine coolant temperature 80_C or higher and the engine running
Set Conditions
DTarget value minus actual value is 1 V or more.DTiming controlvalve inoperative
DTiming controlvalveopencircuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
OK
OK
Check and repair the harness between the
control relay and the injectionpump
assembly connector.
Timing controlvalve check (Refer to
P.13C-40.)
Replace the engine-ECU. OK
RepairCheck the following connector:
D-110
Check the trouble symptoms.NG NG NG
Check the following connector:
B-38NG
Repair
OK
Check the trouble symptoms.
NG
NGMeasure at D-110 engine-ECU connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 3 and the earth
(Ignition switch: ON)
OK:
System voltageOK
Measure at B-38 injectionpumpassembly
connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 5 and the earth
(Ignition switch: ON)
OK:
System voltage
Replace injection pumpassembly.
Check and repair the harness between the
engine-ECU and the injection pump
assembly connector.


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DIESEL FUEL <4M4> -Troubleshooting13C-32
DATA LIST REFERENCE TABLE
Item
No.Check itemInspection conditionsValue to be
determined
as normalCode No.
or inspec-
tion proce-
dure No.Reference
page
01Boost air
temperatureIgnition switch: ON or
the engine runningWhen the intake air
temperature is - 20_C-20_CCode No.
1613C-11
sensorWhen the intake air
temperature is 0_C0_C
When the intake air
temperature is 20_C20_C
When the intake air
temperature is 40_C40_C
When the intake air
temperature is 80_C80_C
02Engine cool-
ant temper-
ature sensorIgnition switch: ON or
the engine runningWhen the engine cool-
ant temperature is
-20_C-20_CCode No.
1513C-11
When the engine cool-
ant temperature is
0_C0_C
When the engine cool-
ant temperature is
20_C20_C
When the engine cool-
ant temperature is
40_C40_C
When the engine cool-
ant temperature is
80_C80_C
03BarometricIgnition switch: ONAltitude 0 m101 kPaCode No.13C-10
pressureAltitude 600 m95 kPa13
sensorAltitude 1,200 m88 kPa
Altitude 1,800 m81 kPa
04Boost pres-DEngine coolantAltitude 0 m101 kPaCode No.13C-9
sure sensortemperature:Altitude 600 m95 kPa12
80 - 95_C
DLamps, electricalAltitude 1,200 m88 kPa
cooling fan, andAltitude 1,800 m81 kPaaccessories: OFF
DTransmission: PIdling81 - 109 kPaDTransmission: P
range
DIgnition switch: ON
When sudden racing is
doneIncreased
05Fuel tem-
peratureIgnition switch: ON or
the engine runningWhen the fuel temper-
ature is - 20_C-20_CCode No.
1413C-10
sensorWhen the fuel temper-
ature is 0_C0_C
When the fuel temper-
ature is 20_C20_C
When the fuel temper-
ature is 40_C40_C
When the fuel temper-
ature is 80_C80_C


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DIESEL FUEL <4M4> -Troubleshooting13C-35
Item
No.Check itemInspection conditionsValue to be
determined
as normalCode No.
or inspec-
tion proce-
dure No.Reference
page
50Condenser
fan relayIgnition switch: ONA/C switch: OFF
(engine coolant tem-
perature at 109_Cor
higher)
A/C switch: ON
(engine coolant tem-
perature at 109_Cor
higher or no higher
than 109_C and the
vehicle speed at 60
km/h or slower)ON––
A/C switch: OFF
(engine coolant tem-
perature at 109_Cor
lower)
A/C switch: ON
(engine coolant tem-
perature at 109_Cor
lower or no higher than
109_C and the vehicle
speed at 60 km/h or
faster)OFF
52Glow plug
relayIgnition switch:
OFF®ONEngine coolant tem-
perature at 60_Cor
lowerON––
Engine coolant tem-OFF
perature at 60_Cor
higher
53Main throttleIgnition switch: ON (Engine stops)OFF––
solenoid
valveEngine: Idling after warming up the engineON
54Sub throttleEngine: Idling after warming up the engineOFF––
solenoid
valveEngine: Idling®Stop (within 3 seconds)ON
55EngineIgnition switch: OFF®ONON (For 5Procedure13C-25
warning
lampseconds)No. 3
56Glow lampIgnition switch:
OFF®ONThe engine coolant
temperature at 60_C
or lowerON––
The engine coolant
temperature at 60_C
or higherOFF


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DIESEL FUEL <4M4> -Troubleshooting13C-36
Item
No.Reference
page Code No.
or inspec-
tion proce-
dure No. Value to be
determined
as normal Inspection conditions Check item
58NeutralIgnition switch: ONN, P rangeN, P––
switchNone of the aboveD, R
60Fuel cut
relayIgnition switch: ON®OFF afterwards for a
certain period of timeON––
None of the aboveOFF
61EGR controlTurning off EGR quicklyON––
solenoid
valve No. 2None of the aboveOFF
62AT/MTIgnition switch: ONVehicles with A/TA/T––
switchVehicles with M/TM/T
68A/C switch 2A/C: Under high load or low loadON––
A/C: OFF or under medium loadOFF
69Warm up
switchDWarm up switch: ON
DHeater temperature setting: Maximum
DEngine coolant temperature: 90_C or lower
DBlower fan: ONON––
None of the aboveOFF
70PTC heaterDWarm up switch: ON
DHeater temperature setting: Maximum
DEngine coolant temperature: 65_Cto75_C
or lower
DBlower fan: ONON––
None of the aboveOFF
71PowerPower steering switch: ONON––
steering
switchPower steering switch: OFFOFF


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DIESEL FUEL <4M4> -Troubleshooting13C-40
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
36Selector switch be-
tween A/T and M/TIgnition switch: ON0-1V
37Inhibitor switchIgnition switch: ON
(Engine stops)Set the selector lever to P
or N0-1V
Set the selector lever to D,
2, L, or RSystem voltage
39Stop lamp switchDepress the brake pedalSystem voltage
40Brake switchDepress the brake pedal0-1V
46Control relayIgnition switch: ON0-1V
Ignition switch: ON®OFF (in about 8 seconds)System voltage
51Engine speed sensor
(backup)Engine: Idling1.5 - 2.5 V
55Accelerator pedal posi-
tion sensor (sub)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position4.1 V or higher
71Ignition switch-STEngine: Cranking8 V or higher
74Control sleeve positionIgnition switch: ON (Engine stops)2.2 - 2.7 V
73sensor2.0 - 4.0 V
752.0 - 4.0 V
76Timer piston positionIgnition switch: ON (Engine stops)2.2 - 2.7 V
77sensor2.0 - 4.0 V
782.0 - 4.0 V
80Back-up power supplyIgnition switch: OFFSystem voltage
82Ignition switch-IGIgnition switch: ONSystem voltage
83Engine coolant tem-
perature sensorIgnition switch: ONEngine coolant tempera-
ture: 0_C3.4 - 4.5 V
Engine coolant tempera-
ture: 20_C2.6 - 3.6 V
Engine coolant tempera-
ture: 40_C1.8 - 2.5 V
Engine coolant tempera-
ture: 80_C0.7 - 1.1 V
84Accelerator pedal posi-
tion sensor (main)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position4.1 V or higher
85Boost pressure sensorIgnition switch: ON (760 mmHg)1.2 - 1.6 V
86Vehicle speed sensorDIgnition switch: ON
DMove the vehicle forward slowly0V«5 V (repeat the
change)


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