Mitsubishi L200. Manual — part 85
TROUBLESHOOTING
DIESEL FUEL
13A-136
STEP 9. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair or replace the connector.
STEP 10. Check harness between A-46 (terminal
No. 2) fuel temperature sensor connector and C-
105 (terminal No. 79) engine-ECU connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
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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
AK501326
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2
AB
A-46 (B)
Harness side
connector
Connector: A-46
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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-137
STEP 11. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Repair or replace the connector.
STEP 12. Check harness between A-46 (terminal
No. 1) fuel temperature sensor connector and C-
105 (terminal No. 55) engine-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
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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
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
AKA00089
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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-138
Code No. P0183: Fuel Temperature Sensor Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the fuel tem-
perature sensor output terminal (terminal No. 1)
of the air flow sensor connector from the engine-
ECU (terminal No. 55).
• The power voltage is earthed to the engine-ECU
(terminal No. 79) from the fuel temperature sen-
sor (terminal No. 2).
FUNCTION
• The fuel temperature sensor converts the intake
air temperature into a voltage and inputs the volt-
age signal to the engine-ECU.
• In response to the signal, the engine-ECU cor-
rects the fuel injection amount, etc.
• The fuel temperature sensor is a kind of resistor,
which has characteristics to reduce its resistance
as the intake air temperature rises. Therefore, the
sensor output voltage varies with the fuel temper-
ature, and becomes lower as the fuel tempera-
ture 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.
Judgment Criterion
• The fuel temperature sensor output voltage is
4.95 V or more for 0.5 second.
PROBABLE CAUSES
• Failed fuel temperature sensor
• Open circuit or harness damage in fuel tempera-
ture sensor circuit or loose connector contact
• Failed engine-ECU
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AB
79
55
Fuel temperature sensor
Engine-ECU
2
1
Fuel Temperature Sensor Circuit
BR
Y-B
A-46
(MU802406)
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
5 V
TROUBLESHOOTING
DIESEL FUEL
13A-139
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 21: Fuel temperature sensor
OK: At ambient temperature (fuel tempera-
ture) or equivalent.
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-46 fuel temperature
sensor connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check fuel temperature sensor itself.
• Check fuel temperature sensor itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the fuel temperature sensor.
STEP 4. Perform voltage measurement at A-46
fuel 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.
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
AKA00089
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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
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