2000 MITSUBISHI MONTERO Service Repair Manual

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-23
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 is 1 V or more for 1 secondDControl sleeve position sensor inoperative
DGE actuator inoperative
DControl sleeve position sensor open circuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
OK
Check and repair the harness between the
control relay and the injection pump
assembly connector.
GE actuator check (Refer to P.13E-61.)
Replace the engine-ECU. OK
RepairCheck the following connector:D-110
Check the trouble symptoms.NGNG 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 1 and the earth
(Ignition switch: ON)
OK:9 V or higherOK
Measure 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 voltage
Replace injection pump assembly.
Check and repair the harness between the
control relay and the injection pump
assembly connector.
NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-24
Code No. 49 Over boostProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DBoost pressure is higher than the barometric pressure + 133 kPaDMalfunction of the variable geometry actuator
DMalfunction of variable geometry solenoid valve
DVariable geometry solenoid valve open circuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
OKOK
Check and repair the harness between the
control relay and the solenoid valve
connector.
Replace the engine-ECU.OK
ReplaceVariable geometry solenoid valve check
(Refer to GROUP 15 - On-vehicle Service.)
Check the trouble symptoms.NG
NG
Check the following connector:B-61NG
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 17 and earth
(Ignition switch: ON)
OK:System voltageOK
Measure at B-61 variable geometry solenoid
valve connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 2 and earth
(Ignition switch: ON)
OK:System voltage
Check and repair the harness between the
engine-ECU and the solenoid valve
connector.
ReplaceVariable geometry actuator check (Refer to
GROUP 15 - On-vehicle Service.)NG
OK
Repair
Check the following connector:D-110NG
NG
Replace the turbocharger assembly. YESConnect a boost gauge to the boost
pressure sensor hose. When the vehicle is
driven at 1st gear with full throttle, does
boost pressure exceed 133 kPa
momentarily?
NO


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-25
Code No. 51 EGR valve position sensor systemProbable cause
Range of Check
DIgnition switch: ON, except during engine cranking
Set Condition
DOutput voltage of EGR valve position sensor for 3 seconds is 4.85 V or
higher, or lower than 0.15 VDEGR valve position sensor inoperative
DEGR valve position sensor open circuit, short
circuit or connector circuit inoperative
DEngine-ECU inoperative
Repair NG
NG
OK
Check the harness between the engine-ECU
and the EGR valve position sensor
connector.
Replace the engine-ECU.
Repair NG
OK
NG
Repair
OK
OK
Check the harness between the
engine-ECU and the EGR valve position
sensor connector.
EGR valve position sensor check
(Refer to P.13E-60.)
OKReplace
Check the following connector:D-113
Check the trouble symptoms.NG
NG
Check the following connector:B-66NG
Repair
OK
Check the trouble symptoms.
NG
NGMeasure at D-113 engine-ECU connector
DConnect the connector.
DVoltage between 90 and earth.
OK:0.4 - 0.6 V
(Ignition switch: ON)
4.1 - 4.8 V
(When 60 kPa of negative pressure is
applied to the EGR valve nipple and the
valve is fully open)OK
Measure at B-66 EGR valve 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 3 and earth
OK:Continuity
Replace the engine-ECU.
Replace the engine-ECU.
Check the following connector:D-112NG
Repair
OK
Check the trouble symptoms.
NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-26
Code No. 52 Variable geometry control pressure sensor
systemProbable cause
Range of Check
DIgnition switch: ON, except during engine cranking
Set Condition
D4.5 V or higher, or 0.2 V or lower
Range of Check
DEngine idling
Set Conditions
DThe difference between target and actual negative pressures remains 10.6
kPa or more for 10 seconds.DVariable geometry control pressure sensor
inoperative
DVariable geometry control pressure sensor open
circuit, short circuit or connector contact
inoperative
DVacuum hose disconnected or ruptured
DEngine-ECU inoperative
NGReplace the engine-ECU.
Check the harness between the
engine-ECU and the variable
geometry control pressure sensor
connector, if necessary.
NG
Check the trouble symptoms.OK
NG
Repair
Replace the variable geometry
control pressure sensor.OK
NG
Repair
Check the vacuum hose and pipe
between the variable geometry
control pressure sensor and
alternator.OK
NG
Repair
NG
NG
Check the trouble symptoms.OK
Repair
Check the trouble symptoms.
OK
Replace the engine-ECU.OK
Repair NG NG
Check the harness between the
engine-ECU and the variable
geometry control pressure sensor
connector.
Check the trouble symptoms.OK
NG
Repair
Check the following connector:
D-111NG
Repair
OK
OKOK
Check the following connector:
B-63NG
NGNG
Check the following connector:
B-63
Measure at B-63 variable geometry
control pressure sensor connector.
DConnect the connector.
(Use the test harness:
MB991348)
DVoltage between 1 and earth
(Ignition switch: ON)
OK:Altitude 0 m: 3.7 - 4.3 V
Altitude 1,200 m: 3.2 - 3.8
V
OK:0.5 - 1.2 V when 80 kPa
of negative pressure is ap-
plied to the sensor
Measure at D-111 engine-ECU
connector
DConnect the connector.
DVoltage between 45 and earth.
(Ignition switch: ON)
OK:Altitude 0 m: 3.7 - 4.3 V
Altitude 1,200 m: 3.2 - 3.8
V
OK:0.5 - 1.2 V when 80 kPa
of negative pressure is ap-
plied to the sensor
Measure at B-63 variable geometry
control pressure sensor connector
DDisconnect the connector, and
measure at the harness side.
DVoltage between 3 and earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
DContinuity between 2 and earth
OK:ContinuityCheck the following connector:
D-112
Check the harness between the
engine-ECU and the variable
geometry control pressure sensor
connector.


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-27
Code No. 54 Immobilizer systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DImproper communication between the engine-ECU and immobilizer-ECUDRadio interference of encrypted codes
DIncorrect encrypted code
DMalfunction of harness or connector
DMalfunction of immobilizer-ECU
DEngine-ECU inoperative
NOTE
(1) If the ignition switches are close each other when starting the engine, radio interference may cause
this code to be displayed.
(2) This code may be displayed when registering the key encrypted code.
Is there another ignition key near the ignition key that is inserted
in the ignition switch?Ye sRemove the extra ignition key
No
Check the following connectors:
D-112, D-202, D-133, E-13NG
Repair
No
Is a diagnosis code output from the immobilizer-ECU?Ye sCheck the immobilizer system. (Refer to GROUP 54 - Ignition
Switch and Immobilizer System.)
NG OK
Check the trouble symptoms.
Check the harness between the engine-ECU and immobilizer-ECU.OKReplace the engine-ECU and immobilizer-ECU.
Check the trouble symptoms. NG
RepairNG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-28
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble SymptomInspection
procedure
No.Reference
page
No communication can
beestablishedbe
No communication can be established with all systems.113E-29
beestablishedbe-
tween MUT-IIand the
engine-ECU.
No communication can be established only with the
engine-ECU.213E-29
Engine warning lamp
relatedImmediately after the ignition switch is “ON”, the engine
warning lamp does not turn on.313E-30
The engine warning lamp keeps on and does not turn off.413E-30
Starting performanceNo initial combustion (unable to start)513E-31
Starting performance is bad when the engine is cold (difficult to
start)613E-31
Starting performance is bad regardless of when the engine is
hot or cold (difficult to start)713E-32
Idling stability
(idling inoperative)Low idling speed when the engine is cold (improper idling
speed)813E-32
High idling speed (improper idling speed)913E-32
Low idling speed (improper idling speed)1013E-33
Idling instable (rough idling, hunting)1113E-33
Idling stability
(idlingsustainmentin
The engine halts after running for a while.1213E-33
(idling sustainmentin-
operative)
The engine halts during idling.1313E-34
DriveabilityLack of output power1413E-34
Occurrence of abnormal knocking1513E-34
Abnormal black smoke1613E-35
Abnormal white smoke1713E-35
Hunting during driving1813E-35
A/C condenser fan malfunction1913E-36


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-29
INSPECTION PROCEDURES FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
No communication can be established between MUT-II
and all systems.
Probable cause
Probable cause can be found in troubles with the power supply circuit and the
earth circuit to the diagnosis connector.DDiagnosis connector inoperative
DHarness inoperative
OK
Check and repair the earth line.
OK
Replace MUT-II.
NG
Check and repair the harness
between the power supply and
diagnosis connector.
OK
Check the trouble symptoms.NG
Repair
NGCheck the following connectors:
D-27, D-211, D-210
NGMeasure at D-23 diagnosis
connector.
DVoltage between 16 and the
earth
OK:System voltage
Measure at D-23 diagnosis
connector.
DContinuity between 4 and the
earth
DContinuity between 5 and the
earth
OK:Continuity
INSPECTION PROCEDURE 2
No communication can be established between MUT-II
and the engine-ECU.
Probable cause
Probable causes are shown in the following:
DThe power is not supplied to the engine-ECU.
DThe earth circuit of the engine-ECU inoperative
DThe engine-ECU inoperative
DCommunication between the engine-ECU and MUT-IIinoperativeDThe power supply circuit of the engine-ECU
inoperative
DEngine-ECU inoperative
DOpen circuit at the harness between the
engine-ECU and the diagnosis connector
NG
Check the harness between the engine-ECU and diagnosis
connector.NGRepair
OK
Check the trouble symptoms.
Check the following connectors:D-112, E-13, D-33, D-23,
D-06 , D-40 the RV meter>NG
Repair
OK
The engine-ECU power supply and the earth circuit check
(Refer to P.13E-37, Inspection procedure 20.)
NOTE
If the trouble symptoms persist even after implementing the above - mentioned inspection procedure
to the vehicle with center display, check the center display or the RV meter and replace it if necessary.
(Refer to GROUP 54A - Clock or Center display.)


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-30
INSPECTION PROCEDURE 3
Immediately after the ignition switch is “ON”, the engine
warning lamp does not turn on.
Probable cause
The engine-ECU turns on the engine warning lamp for 5 seconds immediately
after turning on the ignition switch to check the bulb for being blown.
If the engine warning lamp does not turn on immediately after turning the ignition
switch ON, problems shown in the right could exist.DThe engine warning lamp blown
DThe engine warning lamp circuit inoperative
DEngine-ECU inoperative
NG
Replace the engine-ECU.
NG
Check and repair the harness
between the combination meter and
the engine-ECU connector.
NG
Check and repair the engine warning
lamp power supply circuit.
OK
Check the trouble symptoms.
OK
Measure at D-01 combination meter
connector.
DDisconnect the connector and
measure at the harness side.
DVoltage between 62 and the
earth (Ignition switch: ON)
OK:System voltageOKCheck the following connectors:
D-01, D-02, D-110, E-13NG
Repair
NG
Check bulb for being blown.
OK
Check the trouble symptoms.
OK
Measure at D-110 engine-ECU
connector.
DDisconnect the connector and
measure at the harness side.
DShort circuit between 8 and the
earth (Ignition switch: ON)
OK:The engine warning lamp turns
on.OKCheck the following connector:
D-110NG
Repair
MUT-IIData list
11 Engine-ECU power supply voltage
(Refer to P.13E-41.)NGThe engine-ECU power supply and
the earth circuit check (Refer to
P.13E-37, Inspection procedure 20.)
INSPECTION PROCEDURE 4
The engine warning lamp keeps on and does not turn
off.
Probable cause
The probable causes can be found in either the engine-ECU detecting the
malfunction in the sensor and/or the actuator, or the problem shown in the right
takes place.DShort circuit at the harness between the engine
warning lamp and the engine-ECU
DEngine-ECU inoperative
Check the following connector:E-13
NO
Measure at D-02 combination meter connector.
DDisconnect the connector and measure at the harness
side.
DDisconnect the engine-ECU connector D-110.
DContinuity between 38 and the earth
OK:No continuityNGCheck and repair the harness between the combination meter
and the engine-ECU connector.
OK
MUT-IISelf-Diag code
Is a diagnosis code output?YESInspection chart for diagnosis codes (Refer to P.13E-8.)
Check the trouble symptoms.OKReplace the engine-ECU. NGNG
Repair


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