MITSUBISHI MONTERO 2000 Service Repair Manual

NOTES


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Service Bulletins
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13C-1
DIESEL FUEL
<4M4>
CONTENTS
GENERAL 2.................................
Outline of Changes 2...........................
SERVICE SPECIFICATIONS 2.................
TROUBLESHOOTING 2.......................ON-VEHICLE SERVICE 12....................
Throttle Body Assembly Check 12................
INJECTION PUMP 13.........................


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DIESEL FUEL <4M4> -General/Service Specifications/Troubleshooting13C-2
GENERAL
OUTLINE OF CHANGES
Some service procedures have been established as the following changes have been made due to the
compliance with the Emission Regulation StepIII.
DThe intake manifold cover and injection pump cover have been reshaped.
DThe throttle body assembly has been changed.
DThe EGR valve assembly has been changed.
SERVICE SPECIFICATIONS
ItemStandard value
Throttle body assembly resistanceΩat - 10 - 50_C12 - 20
at 50 - 100_C12 - 23
TROUBLESHOOTING
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 = 40 % , 28 %
DVoid cruise control
Idle switchDVoid idling speed control
DVoid cruise control
Engine speed sensorDEngine controlled at low speed
DVoid cruise control
Boost air temperature sensorMaintain the intake air temperature at 50_C
Vehicle speed sensorDVoid idling speed control
DVoid cruise control
DWith accelerator pedal released (when idle switch is on)
Accelerator opening angle = 0 %
DWith accelerator pedal depressed (when idle switch is off)
Accelerator opening angle = Fixed at 40 % (M/T), 28 % (A/T)
Engine coolant temperature sensorMaintain the engine coolant temperature at 80_C (engine running), 0_C
(engine stopped or just started)
Control sleeve position sensorDWith accelerator pedal released (when idle switch is on)
Engine speed = 800 r/min
DWith accelerator pedal depressed (when idle switch is off)
Engine speed = 2,000 r/min
DVoid cruise control
Timer piston position sensorDOpen control by means of engine speed
DVoid cruise control
Barometric pressure sensor (ECU built-in)Keep the barometric pressure at 101 kPa


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DIESEL FUEL <4M4> -Troubleshooting13C-3
Diagnosis item Control features in malfunction
Fuel temperature sensorMaintain the fuel temperature at 90_C
Boost pressure sensorDKeep the boost pressure as barometric pressure (101 kPa)
DVoid cruise control
Injection correction ROMDWhen backup data is normal: Correction calculation using backup
data
DWhen backup data is corrupted: Fixed at correction value±0%
GE actuatorDWith accelerator pedal released (when idle switch is on)
Engine speed = 800 r/min
DWith accelerator pedal depressed (when idle switch is off)
Engine speed = 2,000 r/min
DVoid cruise control
Over boostVoid cruise control
Timing control valveDOpen control by means of engine speed
DVoid cruise control
Throttle body assemblyVoid cruise control
EGR sensorEGR control is prohibited
EGR motorEGR control is prohibited
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference page
11Accelerator pedal position sensor system13C-4
12Boost pressure sensor (boost sensor) system13C-4
13Barometric pressure sensor system13C-4
18Engine speed sensor (backup) system13C-4
21Engine speed sensor system13C-5
23Idle switch (accelerator pedal position sensor built-in) system13C-5
27Accelerator pedal position sensor (sub) system13C-5
41Throttle valve system13C-6
46Injection correction ROM system13C-6
48GE actuator (in the middle of control sleeve position sensor inoperative) system13C-7
51EGR valve system13C-8


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DIESEL FUEL <4M4> -Troubleshooting13C-4
INSPECTION PROCEDURE FOR DIAGNOSIS CODE
Code No. 11 Accelerator pedal position sensor systemProbable cause
Range of Check
DIgnition switch: ON, accelerator pedal position sensor (sub) operative, except
for during engine cranking
Set Conditions
DOutput voltage of accelerator pedal position sensor (sub) for one second is
0.2 V or higher and lower than 2.5 V and output voltage of accelerator pedal
position sensor (main) for one second is 4.5 V or higher, or lower than 0.2
V.
DOutput voltage of accelerator pedal position sensor (main) for 1 second is
lower 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 for 0.2 second is 1 V or
higher.
DIdle switch: ON, and sensor main output voltage is 1.875 V or higher for 1
second.DAccelerator pedal position sensor inoperative
DAccelerator pedal position sensor open circuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
Inspection procedures are the same as before.
Code No. 12 Boost pressure sensor (boost sensor)
system
Probable cause
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DSensor output voltage for one second is 4.5 V or higher (boost pressure is
approximately 306.7 kPa)
or
DSensor output voltage for one second is 0.2 V or lower (boost pressure is
approximately 13 kPa or lower)
Range of Check
DEngine speed is 1600 r/min or higher and the acceleration opening degree is
75% or 50% or more
Set Conditions
DBoost pressure is lower than the barometric pressure + 13 kPa for two
seconds.DBoost pressure sensor inoperative
DBoost pressure sensor open circuit, short circuit,
or connector contact inoperative
DBoost pressure sensor hose disconnected
DEngine-ECU inoperative
Inspection procedures are the same as before.
Code No. 13 Boost pressure sensor system
Probable cause
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DThe sensor output voltage is 4.5 V or higher for 3 seconds
or
DThe sensor output voltage is 1.5 V or lower for 3 secondsDEngine-ECU inoperative
Inspection procedures are the same as before.
Code No. 18 Engine speed sensor (backup) system
Probable cause
Range of Check
DIgnition switch: ON
DExcept for during engine stall and cranking
Set Conditions
DThe difference in the engine speed sensor output for 4 seconds: 325 r/min or
moreDEngine speed sensor inoperative
DEngine speed sensor open circuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
Inspection procedures are the same as before.


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DIESEL FUEL <4M4> -TroubleshootingDIESEL FUEL <4M4> -Troubleshooting13C-5
Code No. 21 Engine speed sensor systemProbable cause
Range of Check
DDuring engine cranking
Set Conditions
DNo change in the engine speed sensor output voltage for 1 seconds (on
pulse signal has been input)
Range of Check
DIgnition switch: ON
DExcept for during engine stall and cranking
DEngine speed is more than or equal to 600 r/min
Set Conditions
DNo change in the engine speed sensor output 0.3 secondsDEngine speed sensor inoperative
DEngine speed sensor open circuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
Inspection procedures are the same as before.
Code No. 23 Idle switch (accelerator pedal position sensor
built-in) system
Probable cause
Range of Check
Ignition switch: ON, accelerator pedal position sensor (main, sub) operative,
except for during engine cranking
Set Conditions
DIdle switch (built-in): ON, accelerator pedal position sensor (main, sub) output
voltage for 0.8 second 1.875 V or higher
DIdle switch (built-in): OFF, accelerator pedal position sensor (main, sub)
opening degrees less than 1 %DAccelerator pedal position sensor inoperative
DAccelerator pedal position sensor open circuit,
short circuit, or connector contact inoperative
DIdle switch “ON” inoperative
DIdle switch signal line short circuit
DEngine-ECU inoperative
Inspection procedures are the same as before.
Code No. 27 Accelerator pedal position sensor (sub)
system
Probable cause
Range of Check
DIgnition switch: ON, accelerator pedal position sensor (main) operative, except
for during engine cranking
Set Conditions
DOutput voltage of accelerator pedal position sensor (main) for 1 second is
0.2 V or higher and lower than 2.5 V. Output voltage of accelerator pedal
position sensor (sub) for 1 second is 4.5 V or higher.
DOutput voltage of accelerator pedal position sensor (sub) for 1 second is
lower than 0.2 V.
Range of Check
DIgnition switch: ON, except for during engine cranking
Set Conditions
DOutput voltage of accelerator pedal position sensor (main and sub) is 0.2 V
or higher or lower than 4.5 V.
DThe difference in the output sensor voltage between the main and the sub
sensor for 0.2 seconds is 1.0 V or more.DAccelerator pedal position sensor inoperative
DAccelerator pedal position sensor open circuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
Inspection procedures are the same as before.


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