Mitsubishi L200. Manual — part 116
TROUBLESHOOTING
DIESEL FUEL
13A-260
• Failed engine-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 117: No.1 exhaust gas temperature sensor
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 :
Go to Step 2 .
STEP 2. Connector check: A-149 No.1 exhaust
gas temperature sensor connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check No.1 exhaust gas temperature
sensor itself.
• Check No.1 exhaust gas temperature sensor
itself (Refer to GROUP 17
− Emission Control −
Diesel Particulate Filter (DPF) System
− No.1
exhaust gas temperature sensor Check ).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the No.1 exhaust gas temperature
sensor. After replacing the No.1 exhaust
gas temperature sensor, carry out the
forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
STEP 4. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
AKB00276
1
2
Harness side
connector
AB
A-149 (B)
Connector: A-149
AKA00089
1
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
TROUBLESHOOTING
DIESEL FUEL
13A-261
STEP 5. Check harness between A-149 (terminal
No. 1) No. 1 exhaust gas temperature sensor
connector and C-105 (terminal No. 58) engine-
ECU connector.
• Check output line for 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 117: No.1 exhaust gas temperature sensor
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 ). 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 ).
AKB00276
1
2
Harness side
connector
AB
A-149 (B)
Connector: A-149
AKA00089
1
2
3
4
5
6
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96
C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
TROUBLESHOOTING
DIESEL FUEL
13A-262
Code No. P0546: No. 1 exhaust gas temperature sensor Circuit High Input <Euro5>
OPERATION
• A power voltage of 5 V is applied to the No. 1
exhaust gas temperature sensor output terminal
(terminal No. 1) from the engine-ECU (terminal
No. 58).
• The power voltage is earthed to the engine-ECU
(terminal No. 82) from the No. 1 exhaust gas tem-
perature sensor (terminal No. 2).
FUNCTION
• The No. 1 exhaust gas temperature sensor con-
verts the exhaust gas temperature into a voltage
and inputs the voltage signal to the engine-ECU.
• Engine-ECU uses this voltage for DPF regenera-
tion control.
• The No. 1 exhaust gas temperature sensor is a
kind of resistor, which has characteristics to
reduce its resistance as the exhaust gas temper-
ature rises. Therefore, the sensor output voltage
varies with the exhaust gas temperature, and
becomes lower as the exhaust gas temperature
rises.
TROUBLE JUDGMENT
Check Conditions
• Battery positive voltage is 8 − 16 V.
• 2 seconds later after the ignition switch has been
in "ON" position or the engine has started up.
• Vehicle speed is 20 km/h or higher.
Judgment Criterion
• The No. 1 exhaust gas temperature sensor out-
put voltage is 4.95 V or more.
PROBABLE CAUSES
• Failed No. 1 exhaust gas temperature sensor
AKB00275
1
2
3
4
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73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
1 2
AB
O-G
BR-L
Engine-ECU
No. 1 exhaust gas
temperature sensor
A-149
MU802601
No. 1 Exhaust Gas Temperature Sensor Circuit
2
82
1
58
5 V
C-105
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Grey
R: Red P: Pink V: Violet PU: Purple SI: Silver
TROUBLESHOOTING
DIESEL FUEL
13A-263
• Open circuit or harness damage in No. 1 exhaust
gas temperature sensor circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
a. Item 117: No. 1 exhaust gas temperature sensor
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 :
Go to Step 2 .
STEP 2. Connector check: A-149 No. 1 exhaust
gas temperature sensor connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check No. 1 exhaust gas temperature
sensor itself.
• Check No. 1 exhaust gas temperature sensor
itself (Refer to GROUP 17
− Emission Control −
Diesel Particulate Filter (DPF) System
− No. 1
exhaust gas temperature sensor Check ).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the No. 1 exhaust gas temperature
sensor. After replacing the No. 1 exhaust
gas temperature sensor, carry out the
forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
STEP 4. Perform voltage measurement at A-149
No. 1 exhaust gas temperature sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: 4.5
− 4.9 V
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 5 .
STEP 5. Connector check: C-105 engine-ECU
connector.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
AKB00276
1
2
Harness side
connector
AB
A-149 (B)
Connector: A-149
AKB00276
1
2
Harness side
connector
AB
A-149 (B)
Connector: A-149
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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27
28
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96
C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
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