Mitsubishi L200. Manual — part 127
TROUBLESHOOTING
DIESEL FUEL
13A-304
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-143 fuel filter
pressure switch connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Check the fuel filter pressure switch
itself.
Check the fuel filter pressure switch itself (Refer to
GROUP 13B
− Fuel Filter − Fuel Filter Inspection ).
Q: Is the check result normal?
YES :
Replace the fuel filter body.
NO :
Go to Step 3 .
STEP 3. Perform voltage measurement at A-143
fuel filter pressure switch connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Go to Step 4 .
STEP 4. Connector check: C-103 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
AK700919
1
2
AC
Connector: A-143
A-143 (B)
Harness side
connector
AK700919
1
2
AC
Connector: A-143
A-143 (B)
Harness side
connector
AKA00090
101
102
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116
144
C-103 (B)
C-103 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-103
AB
TROUBLESHOOTING
DIESEL FUEL
13A-305
STEP 5. Check harness between A-143 (terminal
No. 1) fuel filter pressure switch connector and
C-103 (terminal No. 110) engine-ECU connector.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
STEP 6. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 152: Fuel filter pressure switch
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points
− How to Cope
with Intermittent Malfunctions ).
NO :
Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number
(Refer to GROUP 00
− Precautions Before
Service
− How to Perform Chassis Number
Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00
−
Precautions Before Service
− What The
Common Rail Engine Learns ).
STEP 7. Perform resistance measurement at A-
143 fuel filter pressure switch connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 2 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Check and repair harness between A-143
(terminal No. 2) fuel filter pressure switch
connector and body earth.
• Check earthing line for open circuit
and damage.
AK700919
1
2
AC
Connector: A-143
A-143 (B)
Harness side
connector
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
120
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143
146
147
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149
150
151
152
153
154
155
156
157
158
117
145
116
144
C-103 (B)
C-103 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-103
AB
AK700919
1
2
AC
Connector: A-143
A-143 (B)
Harness side
connector
TROUBLESHOOTING
DIESEL FUEL
13A-306
STEP 8. Connector check: C-103 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace the connector.
STEP 9. Check harness between A-143 (terminal
No. 1) fuel filter pressure switch connector and
C-103 (terminal No. 110) engine-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Replace the fuel filter.
NO :
Repair the damaged harness wire.
Code No. P1277: Fuel Filter Freeze <Vehicles with fuel filter pressure switch>
FUNCTION
• The engine-ECU estimates that the fuel filter is
freezing, using the input signal from the each
sensor.
• When storing this diagnosis code, the engine-
ECU blinks the glow lamp.
TROUBLE JUDGMENT
Check Conditions
• During steady driving
• Fuel temperature is lower than specified temper-
ature
• Engine coolant temperature is lower than speci-
fied temperature
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
120
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123
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143
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147
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149
150
151
152
153
154
155
156
157
158
117
145
116
144
C-103 (B)
C-103 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-103
AB
AK700919
1
2
AC
Connector: A-143
A-143 (B)
Harness side
connector
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
146
147
148
149
150
151
152
153
154
155
156
157
158
117
145
116
144
C-103 (B)
C-103 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-103
AB
TROUBLESHOOTING
DIESEL FUEL
13A-307
Judgment Criteria
• Determination of clogged fuel filter
• Fuel pressure hunting occurs more than certain
degree, or difference more than certain degree
exists between target fuel pressure and actual
fuel pressure
PROBABLE CAUSE
• Fuel filter Freezing
DIAGNOSIS PROCEDURE
STEP 1. Reconfirmation of M.U.T.-III diagnosis
code after warming up the engine
Q: Is any other diagnosis code than P1276 output?
YES :
Inspection chart for diagnosis code (Refer
to ).
NO :
Check end.
Code No. P1298: Variable Geometry Turbocharger Control System Malfunction (high pressure)
<Euro5>
FUNCTION
• The engine-ECU controls the duty ratio of the
variable geometry control solenoid valve so that
the actual boost pressure can become the target
boost pressure.
TROUBLE JUDGMENT
Check Condition
• Engine is running
Judgment Criterion
• Actual boost pressure is higher than target boost
pressure by more than 6.7 kPa
PROBABLE CAUSES
• Failed variable geometry turbocharger control
system
• Failed engine-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Check the turbocharger supercharging
pressure.
• Check the turbocharger supercharging pressure
(refer to GROUP 15
− On-vehicle Service − Tur-
bocharger Supercharging Pressure Check ).
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair the variable geometry turbocharger
control system.
STEP 2. M.U.T.-III diagnosis code.
• After clearing the diagnosis code through M.U.T.-
III, start the engine and confirm whether the diag-
nosis code is output.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number
(Refer to GROUP 00
− Precautions Before
Service
− How to Perform Chassis Number
Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00
−
Precautions Before Service
− What The
Common Rail Engine Learns ). After
registering the injector identification code,
carry out the forcible DPF regeneration.
(Refer to GROUP 17
− Emission Control −
Diesel Particulate Filter (DPF) System
−
Forcible DPF Regeneration ).
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points
− How to Cope
with Intermittent Malfunctions ).
Code No. P1299: Variable Geometry Turbocharger Control System Malfunction (low pressure)
<Euro5>
FUNCTION
• The engine-ECU controls the duty ratio of the
variable geometry control solenoid valve so that
the actual boost pressure can become the target
boost pressure.
TROUBLE JUDGMENT
Check Condition
• Engine is running
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