2000 MITSUBISHI MONTERO Service Repair Manual

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-7
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 sensorDAccelerator pedal released (idle switch ON)
Acceleration opening degree = 0 %
DAccelerator pedal applied (idle switch OFF)
Engine controlled at low speed
Acceleration opening degree = 30 % fixed
DVoid EGR control
Idle switchVoid idling speed control.
Engine speed sensorDEngine controlled at low speed
DVoid EGR control
DVoid variable geometry turbocharger control
Boost air temperature sensorDMaintain the intake air temperature at 50_C.
DVoid EGR control
Vehicle speed sensorDVoid idling speed control.
DVoid EGR control
Engine coolant temperature sensorDMaintain the engine coolant temperature at 80_C (However, the system
assumes the coolant temperature as 0_C).
DVoid EGR control
Control sleeve position sensorDEngine controlled at low speed
DVoid EGR control
DVoid variable geometry turbocharger control
Timer piston position sensorDInjection timing stabilizing control
DVoid EGR control
Barometric pressure sensor (ECU
built-in)DKeep the barometric pressure at 101 kPa.
DVoid EGR control
DVoid variable geometry turbocharger control
Fuel temperature sensorMaintain the fuel temperature at 40_C.
Boost pressure sensorDKeep the boost pressure as barometric pressure (101 kPa).
DVoid EGR control
DVoid variable geometry turbocharger control
Injection volume adjusting ROMVoid correction.
GE actuatorDEngine controlled at low speed
DVoid EGR control
DVoid variable geometry turbocharger control
Over boostDVoid variable geometry turbocharger control
DEngine controlled at low fuel injection
Timing control valveDInjection timing stabilizing control
DVoid EGR control
EGR valve position sensorVoid EGR control
Variable geometry control pressure
sensorDVoid EGR control
DVoid variable geometry turbocharger control


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-8
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference
page
11Accelerator pedal position sensor (main) system13E-9
12*Boost pressure sensor system13E-10
13Barometric pressure sensor (ECU built-in) system13E-11
14Fuel temperature sensor system13E-11
15Engine coolant temperature sensor system13E-12
16Boost air temperature sensor system13E-12
17Vehicle speed sensor system13E-13
18Pump speed sensor system13E-14
21Crank angle sensor system13E-15
23Idle switch (accelerator pedal position sensor built-in) system13E-16
25*Timer piston position sensor system13E-17
26*Control sleeve position sensor system13E-18
27Accelerator pedal position sensor (sub) system13E-19
41*Throttle solenoid valve system13E-20
43Timing control valve system13E-21
46Injection volume adjusting ROM system13E-22
48*GE actuator (in the middle of control sleeve position sensor inoperative) system13E-23
49*Over boost (variable geometry control pressure sensor system malfunction)13E-24
51EGR valve position sensor system13E-25
52Variable geometry control pressure sensor system13E-26
54Immobilizer system13E-27
Caution
If 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 <4D5-stepIII>-Troubleshooting13E-9
INSPECTION PROCEDURE FOR DIAGNOSIS CODE
Code No. 11 Accelerator pedal position sensor (main)
systemProbable cause
Range of Check
DIgnition switch: ON, accelerator pedal position sensor (sub) operative, except
for during engine cranking
Set Conditions
DAccelerator pedal position sensor output voltage is as below for 1 second:
Sub side: 0.2 V or more, less than 2.5 V
Main side: 4.5 V or more
or
Sub or main side: less than 0.2 V
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DThe output voltage of accelerator pedal position sensor (main and sub) for
0.2 second is 0.2 V or higher, or lower than 4.5 V and the difference in
sensor output voltage between the main and sub is 1 V or higher, or idle
switch: ON, and sensor main output voltage is 1.875 V or higher.DAccelerator pedal position sensor inoperative
DAccelerator pedal position sensor open circuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
NGOK
OK
Measure at D-135 accelerator pedal position
sensor connector
DDisconnect the connector and measure
at the harness side.
DVoltage between 2 and earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 1 and earth
OK:ContinuityNGCheck the following connector:D-113NG
Repair
OK
OKRepair
NGAccelerator pedal position sensor check
(Refer to P.13E-57.)Replace
Check the trouble symptoms.
Replace the engine-ECU.NG
Check the trouble symptoms.
NG
Replace the engine-ECU.
NG
RepairCheck the following connectors:
D-113, D-135
OK NG
NG
Check the following connector:D-113NG
Repair
OK
Check the harness between the
engine-ECU and the accelerator pedal
position sensor connector.
OK
Measure at D-113 engine-ECU connector
DConnect the connector.
DVoltage between 84 and the earth
(Ignition switch: ON)
OK:0.9 - 1.1 V
(Throttle lever idling position)
4.1 V or higher
(Throttle lever fully opened position)
Check the harness between the
engine-ECU and the accelerator pedal
position sensor connector.
NG
Repair NG NG
NG
NG
NG
Check the trouble symptoms.
OK
Replace the engine-ECU.


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-10
Code No. 12 Boost pressure sensor (boost sensor)
systemProbable cause
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DSensor output voltage for 1 second is 4.5 V or higher
(boost pressure is approximately 267 kPa).
or
DSensor output voltage for 1 second is 0.2 V or lower
(boost pressure is approximately 51.7 kPa or lower)
Range of Check
DEngine speed is 2,000 r/min or higher, barometric pressure is 69.7 kPa or
less (equivalent to an altitude of 300 m) and under high load.
Set Conditions
DBoost pressure is lower than the barometric pressure + 13 kPa for 3
seconds.DBoost pressure sensor inoperative
DBoost pressure sensor open circuit, short circuit,
or connector contact inoperative
DBoost pressure sensor hose disconnected
DEngine-ECU inoperative
NG
Check the trouble symptoms.
Replace the engine-ECU.
Check the following connector:
D-113
NGOK
NG
Repair
RepairOK
NG
Check the trouble symptoms.
OKOK
OK
Check the following connector:
B-08NG
Check the trouble symptoms. NG
Repair
NG
NG
Check the vacuum hose between the
boost pressure sensor and the intake
manifold.
Replace the boost pressure sensor.
OK OK OK
Repair
NG
Repair
Check the trouble symptoms.
Check the harness between the
engine-ECU and the boost pressure
sensor connector, and repair if
necessary.
NG OK
NG
RepairCheck the following connector:
B-08NG
Measure at B-08 boost pressure
sensor connector
DConnect the connector.
(Test harness: MB991348 used)
DVoltage between 1 and the earth
(Engine: Idling)
OK:1.3 - 1.7 V
DVoltage between 1 and the earth
OK:When the accelerator pedal
is suddenly pressed from
the idling condition, the
voltage temporarily in-
creases from 1.3 V to 1.7
V.
Measure at D-113 engine-ECU
connector
DConnect the connector.
DVoltage between 85 and the
earth (Engine: Idling)
OK:1.3 - 1.7 V
Check the harness between the
engine-ECU and the boost pressure
sensor connector.
Measure at B-08 boost pressure
sensor connector
DDisconnect the connector and
measure at the harness side.
DVoltage between 3 and the earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 2 and the
earth
OK:Continuity
Replace the engine-ECU.NGCheck the harness between the
engine-ECU and the boost pressure
sensor connector.
Replace the engine-ECU.OK
NG
Repair
Check the following connector:
D-112


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-11
Code No. 13 Barometric pressure sensor systemProbable cause
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DThe sensor output voltage is for 3 seconds is 4.5 V or higher (the
barometric pressure is approximately 114 kPa or over).
or
DThe sensor output voltage is for 3 seconds is 1.5 V or lower (the barometric
pressure is approximately 40 kPa or under).
Range of Check
DIgnition switch: ON
DThe coolant temperature is 40_C or lower
Set conditions
DDifference between the barometric pressure and boost pressure sensors is
13.3 kPa or moreEngine-ECU inoperative
Replace the engine-ECU.NGCheck the trouble symptoms.
Code No. 14 Fuel temperature sensor systemProbable cause
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DThe sensor output voltage for 3 seconds is 0.2 V or lower (the fuel
temperature is approximately 125°C or higher).
or
DThe sensor output voltage for 3 seconds is 4.6 V or higher (the fuel
temperature is approximately - 47°C or lower).DFuel temperature sensor inoperative
DFuel temperature sensor open circuit, short circuit,
or connector contact inoperative
DEngine-ECU inoperative
OK
Measure at B-38 fuel temperature sensor
connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 11 and the earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 7 and the earth
OK:ContinuityNGCheck the following connectors:
D-112, D-113NG
Repair
OK
OK
Check the harness between the
engine-ECU and the fuel temperature
sensor connector.Repair
NG
Check the trouble symptoms.
Replace the engine-ECU.NG
Replace the engine-ECU.OKNG
Replace the injection pump.
OK
Repair
Check the following connector:B-38
NG
NGCheck the trouble symptoms.
Fuel temperature sensor check (Refer to
P.13E-61.)


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-12
Code No. 15 Engine coolant temperature sensor systemProbable cause
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DThe sensor output voltage for 3 seconds is 4.9 V or higher (the coolant
temperature is approximately - 45_C or lower).
or
DThe sensor output voltage for 3 seconds is 0.2 V or lower (the coolant
temperature is approximately 140_C or higher).DEngine coolant temperature sensor inoperative
DEngine coolant temperature sensor open circuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
NGNG
Repair
OK
OKRepair
NGEngine coolant temperature sensor check
(Refer to P.13E-59.)
Replace the engine-ECU.NG
Replace the engine-ECU.OK NG
OK
Repair
Check the following connector:B-56
NGCheck the trouble symptoms.NG
Measure at B-56 engine coolant temperature
sensor connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:4.1 - 4.9 V
DContinuity between 2 and the earth
OK:ContinuityCheck the following connectors:
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 during engine cranking
Set Conditions
DThe sensor output voltage for 3 seconds is 4.6 V or higher (the intake air
temperature is approximately - 45_C or lower).
or
DThe sensor output voltage for 3 seconds is 0.3 V or lower (the intake air
temperature is approximately 110_C or higher).DBoost air temperature sensor inoperative
DBoost air temperature sensor open circuit, 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.13E-58.)
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 <4D5-stepIII>-Troubleshooting13E-13
Code No. 17 Vehicle speed sensor systemProbable cause
Range of Check
DIgnition switch: ON
DEngine speed: 2,800 r/min or higher
DDriving with heavy load
Set Conditions
DSlower than vehicle speed of 3 km/hDVehicle speed sensor inoperative
DVehicle speed sensor open circuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
Replace the engine-ECU.
NG
OK
Check trouble symptoms.
NG
OK
Check trouble symptom.
NG
Check the following connectors:
C-09, D-113, E-113NG
Repair
YES
Measure at engine-ECU connector D-113.
DDisconnect the connector.
DVoltage between terminal 86 and earth (Ignition switch: ON)
OK:When the vehicle is pushed to move, the cycle change
of 0.5 V is repeated.Check the following
connector:
D-113NG
Repair
Is the speedometer working properly?NO
Check the harness wire between the engine-ECU and the vehicle
speed sensor connector, and repair if necessary.
Check the vehicle speed sensor circuit.
OK


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-14
Code No. 18 Pump speed sensor systemProbable cause
Range of Check
DIgnition switch: ON
DNot during the engine cranking
Set Conditions
DThe difference between the pump speed sensor and the crank angle sensor
output value is 500 r/min or higher for 4 secondsDMalfunction of pump speed sensor
DOpen circuit or short-circuit in pump speed sensor
circuit, or poor sensor contact
DEngine-ECU inoperative
NG
Replace the engine-ECU.OK
Check trouble symptoms.NG
Repair
NG
Check the harness between the
engine-ECU and the pump speed sensor
connector, and repair if necessary.
OK
Replace the injection pump.
OK
Measure at engine-ECU connector D-112.
DConnect the connector.
DVoltage between 51 - 61.
(Engine: idling and then raced)
OK:Voltage increases from the voltage
when engine is idlingNGCheck the following connector:
B-36, D-112NG
Repair
OK
NGPump speed sensor check (Refer to
P.13E-62.)
Check the following connector:D-112
Check the trouble symptoms.


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