2000 MITSUBISHI MONTERO fuel

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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DIESEL FUEL <4M4> -Troubleshooting13C-6
Code No. 41 Throttle valve systemProbable cause
Range of Check
DEngine speed is 1,600 r/min and accelerator opening angle is 50 % or more
Set Conditions
DBoost pressure < barometric pressure + 33 kPa for 12 secondsDMalfunction of throttle valve
DOpen circuit or short-circuit in throttle valve circuit
or poor connector connection
DMalfunction of engine-ECU
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
NG
Check the following connector:D-110
OK
Check the trouble symptoms.
NG
Check and repair the harness between the
engine-ECU and the throttle body assembly
connector.
Repair NG
OK
Check the following connector:B-65 NG
OK
Check the trouble symptoms.
NG
Check and repair the harness between the
control relay and the throttle body assembly
connector.
Repair NG
OK
Check the following connector:B-25X NGMeasure at throttle body assembly connector
B-65.
DIgnition switch: ON
DDisconnect the connector and measure at
the harness side.
DVoltage between (2), (5) and earth
OK:System voltage
RepairThrottle body assembly check (P.13C-12.)NG
Measure at engine-ECU connector D-110.
DIgnition switch: ON
DDisconnect the connector and measure at
the harness side.
DVoltage between (14), (18), (19), (20) and
earth
OK:9 V or more
Repair
Code No. 46 Injection correction ROM systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DWhen communication failsDInjection correction ROM inoperative
DEngine-ECU inoperative
DShort circuit, open circuit, or connector contact
inoperative
Inspection procedures are the same as before.


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DIESEL FUEL <4M4> -Troubleshooting13C-7
Code No. 48 GE actuator (in the middle of control sleeve
position sensor inoperative) systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DTarget value minus actual value for 0.5 second is 1 V or more.DControl sleeve position sensor inoperative
DGE actuator inoperative
DControl sleeve position sensor open circuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
NGGE actuator check (Refer to
P.13C-46.*)Replace injection pump assembly.
NGMeasure at B-38 injection pump
assembly connector.
DDisconnect the connector and
measure at the harness side.
DVoltage between 6 and the earth
(Ignition switch: ON)
OK:System voltageCheck and repair the harness
between the control relay and the
injection pump assembly connector. OK
Check the following connector:
D-110NG OK
Repair
Check the trouble symptoms.Replace the engine-ECU. OK
NOTE:
*: Refer to the 2001 PAJERO Workshop Manual (Pub. No. PWJE0001).


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DIESEL FUEL <4M4> -Troubleshooting13C-8
Code No. 51 EGR valve assembly systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DEGR sensor output voltage is continuously 0.5 V or less, or 4.5 V or more
for 1 second or more
DDifference between EGR sensor output voltage target value and output is
continuously 0.5 V or more for 3 seconds or moreDMalfunction of EGR valve assembly
DOpen circuit or short-circuit in EGR valve
assembly circuit or poor connector connection
DMalfunction of engine-ECU
Check and repair the harness
between the engine-ECU and the
EGR valve assembly connector.
NG
OKCheck the trouble symptoms.
OK
Transient malfunction (Refer to
GROUP 00 - Point to Note for
Intermittent Malfunctions.)
NGMeasure at engine-ECU connector
D-113.
DConnector connected
DIgnition switch: ON
DVoltage between (90) and earth
OK:0.5 - 4.5 VCheck the following connector:
D-113NG
Repair OK
Check and repair the harness
between the engine-ECU and the
EGR valve assembly connector.
NG
OKCheck the trouble symptoms.
OK
Transient malfunction (Refer to
GROUP 00 - Point to Note for
Intermittent Malfunctions.)
OKMUT-IIdata list
31 EGR sensor (Target value)
32 EGR sensor (Output value)Transient malfunction (Refer to
GROUP 00 - Point to Note for
Intermittent Malfunctions.)
NGMeasure at EGR valve assembly
connector B-64.
DDisconnect the connector and
measure at the harness side.
DVoltage between (3) and earth
OK:4.5 - 5.5 V
(Ignition switch: ON)
DContinuity between (2) and earth
OK:ContinuityCheck the following connector:
D-112NG
Repair NG
To the next pageOK
Check and repair the harness
between the control relay and the
EGR valve assembly connector.
NG
OKCheck the trouble symptoms.
OK
Transient malfunction (Refer to
GROUP 00 - Point to Note for
Intermittent Malfunctions.)
NGMeasure at EGR valve assembly
connector B-64.
DIgnition switch: ON
DDisconnect the connector and
measure at the harness side.
DVoltage between (6) and earth
OK:System voltageCheck the following connector:
B-25XNG
Repair OK


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DIESEL FUEL <4M4> -Troubleshooting13C-9
Replace the engine-ECU.
Replace the EGR valve assembly.NG
Check the following connector:
D-113NG OK
Check and repair the harness
between the engine-ECU and the
EGR valve assembly connector.
NG
OKCheck the trouble symptoms.
OK
Transient malfunction (Refer to
GROUP 00 - Point to Note for
Intermittent Malfunctions.)
From the previous page
NGMeasure at engine-ECU connector
D-113.
DIgnition switch: ON
DDisconnect the connector and
measure at the harness side.
DVoltage between (17) and earth
OK:System voltageCheck the following connector:
B-64NG
Repair OK
NG
OKCheck the trouble symptoms.Transient malfunction (Refer to
GROUP 00 - Point to Note for
Intermittent Malfunctions.) OKRepair
Check the trouble symptoms.OK
End
INSPECTION PROCEDURES FOR TROUBLE SYMPTOMS
Inspection procedure 20
Excessive engine vibration when engine stopped
Probable cause
The cause is probably a malfunction of the throttle body assembly.DMalfunction of throttle body assembly (does not
close)
DOpen circuit or short-circuit in throttle body
assembly circuit or poor connector connection
MUT-IIdiagnosis code
Is a diagnosis code output?Ye sDiagnosis code classification chart (Refer to P.13C-3.)
No
Carry out MUT-IIservice data inspection and actuator test. (Refer
to P.13C-10.)OKCheck for seizure of throttle body assembly (stuck open)
(Refer to P.13C-42*.)
RepairNG
NOTE:
*: Refer to the 2001 PAJERO Workshop Manual (Pub. No. PWJE0001).


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DIESEL FUEL <4M4> -Troubleshooting13C-10
DATA LIST REFERENCE TABLE
Item No.Check itemInspection
conditionsValue to be
determined normalCode No. or
inspection
procedure No.Reference page
31EGR sensor
(Target value)Engine: RacingChanges between 0.5
V and 4.5 VCode No. 5113C-8
32EGR sensor
(Output value)Engine: RacingApproaches EGR
sensor (target value).Code No. 5113C-8
36Throttle body
assembly
(Target value)Engine: Idling30 degCode No. 4113C-6
ACTUATOR TEST TABLE
Item No.Check itemDrive contentsInspection
conditionsValue to be
determined as
normalCode No. or
inspection
procedure No.Reference
page
07Throttle body
assemblyThrottle valve:
Fully closedDIgnition
switch: ON
DVehicle
Operating
sound can be
heard
Code No. 4113C-6
08Throttle valve:
Kept at half-
openDVehicle
speed: 0 km/h
DEngine
speed: 1,000
r/minorlower
heard.
09Throttle valve:
Fully openr/minorlower
28EGR valve
assemblyEGR valve:
OpenDIgnition
switch: ON
DVehicle
Operating
sound can be
heard
Code No. 5113C-8
29EGR valve:
ClosedDVehicle
speed: 0 km/hheard.


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