Mitsubishi L200. Manual — part 124
TROUBLESHOOTING
DIESEL FUEL
13A-292
OPERATION
• The electrical current source is supplied from the
engine control relay (terminal No. 3) to the glow
control unit (terminal No. 6). Also, it is supplied
from the glow control unit (terminal No.7) to the
body earth.
• The request signal of operating the glow plug is
input into the glow control unit (terminal No. 1)
from the engine-ECU (terminal No.120).
• The voltage for the glow plug is applied from the
battery to the glow control unit (terminal No. 10).
• The voltage is applied from the glow control unit
(terminal No.1, 2, 3 and 4) to each glow plug.
• The diagnosis signal is output from the glow con-
trol unit (terminal No. 9) to the engine-ECU (ter-
minal No. 126).
FUNCTION
• The voltage applied to the glow control unit (ter-
minal No.10) from the battery is applied to each
glow plug in the duty ratio according to the signal
from the engine ECU.
TROUBLE JUDGMENT
Check Conditions
• While the engine is running
• The electrical continuity duty to the glow plug is
17
− 83 %.
Judgment Criterion
• The diagnosis signal is not received from the
glow control unit for more than 5 seconds.
PROBABLE CAUSES
• Failed glow control unit
• Open/short circuit or harness damage in glow
control unit power supply/earth circuit or loose
connector contact.
• Loose connector contact; open/short circuit or
harness damage of communication wire between
glow control unit and engine-ECU.
• Failed engine-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Connector check: A-151 glow control
unit connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Perform voltage measurement at A-151
glow control unit connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 6 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Go to Step 3 .
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
TROUBLESHOOTING
DIESEL FUEL
13A-293
STEP 3. Connector check: A-20X engine control
relay connector
Q: Is the check result normal?
YES :
Check and repair harness between A-151
(terminal No. 6) glow control unit connector
and A-20X (terminal No. 3) engine control
relay connector.
• Check power supply line for open/
short circuit.
NO :
Repair or replace the connector.
STEP 4. Perform resistance measurement at A-
151 glow control unit connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No.7 and earth.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Check and repair harness between A-151
(terminal No.7) glow control unit connector
and body earth.
• Check earthing line for open circuit
and damage.
STEP 5. Check harness between A-151 (terminal
No. 1) glow control unit connector and C-103
(terminal No. 120) engine-ECU connector.
• Check signal line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
AK501321
2
1
3
4
Relay box's side
connector
A-20X
Connector: A-20X
AC
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
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120
121
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151
152
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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-294
STEP 6. Check harness between A-151 (terminal
No. 9) glow control unit connector and C-103
(terminal No. 126) engine-ECU connector.
• Check signal line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
STEP 7. Check harness between A-151 (terminal
No. 6) glow control unit connector and A-20X
(terminal No. 3) engine control relay connector.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair the damaged harness wire.
STEP 8. M.U.T.-III diagnosis code.
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Go to Step 9 .
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service points
− How to Cope
with intermittent Malfunctions ).
STEP 9. Replace the glow control unit.
• After replacing the glow control unit, reconfirm
whether the diagnosis code is set.
Q: Is the diagnosis code set?
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
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
AKB00264
4 3 2 1
8 7 6 5
11 10 9
AB
A-151 (B)
Harness side
connector
Connector: A-151
AK501321
2
1
3
4
Relay box's side
connector
A-20X
Connector: A-20X
AC
TROUBLESHOOTING
DIESEL FUEL
13A-295
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 :
Check is end.
Code No. P1203: Capacitor Insufficient Charging
FUNCTION
• The engine-ECU monitors the charged state of
the capacitor in the injector drive circuit.
• The engine-ECU checks whether the injector
driving voltage is too low due to insufficient
charging of the capacitor.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in "ON" position
• Except during the engine cranking period
• Battery positive voltage is 8 V or more
Judgment Criterion
• A capacitor in low charge state (40 V or less) is
detected in an engine-ECU internal circuit.
PROBABLE CAUSE
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• After erasing the diagnosis code through M.U.T.-
III, ignition switch is "ON" position and confirm
whether the diagnosis 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,
the vehicle equipped with the DPF carries
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. P1204: Capacitor Excessive Charging
FUNCTION
• The engine-ECU monitors the charged state of
the capacitor in the injector drive circuit.
• The engine-ECU checks whether the injector
driving voltage is too high due to excessive
charging of the capacitor.
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