Mitsubishi L200. Manual — part 80
TROUBLESHOOTING
DIESEL FUEL
13A-116
STEP 10. Check harness between A-107 (terminal
No. 2) engine coolant temperature sensor
connector and C-105 (terminal No. 87) 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.
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.
AK501323
1
2
AB
A-107 (B)
Harness side
connector
Connector: A-107
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
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-117
STEP 12. Check harness between A-107 (terminal
No. 1) engine coolant temperature sensor
connector and C-105 (terminal No. 63) 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.
AK501323
1
2
AB
A-107 (B)
Harness side
connector
Connector: A-107
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
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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-118
Code No. P0118: Engine Coolant Temperature Sensor Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the engine
coolant temperature sensor output terminal (ter-
minal No. 1) from the engine-ECU (terminal No.
63).
• The power voltage is earthed to the engine-ECU
(terminal No. 87) from the engine coolant temper-
ature sensor (terminal No. 2).
FUNCTION
• The engine coolant temperature sensor converts
the engine coolant temperature into a voltage sig-
nal, and inputs the voltage to the engine-ECU.
• In response to the signal, the engine-ECU con-
trols the fuel infection amount and the fast idle
speed when the engine is cold state.
• The engine coolant temperature sensor is a kind
of resistor, which has characteristics to reduce its
resistance as the engine coolant temperature
rises. Therefore, the sensor output voltage varies
with the engine coolant temperature, and
becomes lower as the engine coolant 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 engine coolant temperature sensor output
voltage is 4.95 V or more for 0.5 second.
PROBABLE CAUSES
• Failed engine coolant temperature sensor
• Open circuit in engine coolant temperature sen-
sor circuit or loose connector contact
AKA00095
1 2
1 2
1
2
3
4
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25 26
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43 44 45 46 47 48
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
LG
V
Engine-ECU
Engine coolant
temperature sensor
A-107
(MU802406)
C-105
Engine Coolant Temperature Sensor Circuit
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
2
87
1
63
AB
TROUBLESHOOTING
DIESEL FUEL
13A-119
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 7: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80
− 120°C
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-107 engine coolant
temperature sensor connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Perform resistance measurement at A-
107 engine coolant temperature sensor
connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal No. 1 and No. 2.
OK:
Engine coolant temperature at
−20°C: 14 − 17
k
Ω
Engine coolant temperature at 0
°C: 5.1 − 6.5
k
Ω
Engine coolant temperature at 20
°C: 2.1 − 2.7
k
Ω
Engine coolant temperature at 40
°C: 0.9 − 1.3
k
Ω
Engine coolant temperature at 60
°C: 0.48 −
0.68 k
Ω
Engine coolant temperature at 80
°C: 0.26 −
0.36 k
Ω
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the engine coolant temperature
sensor.
STEP 4. Perform voltage measurement at A-107
engine coolant 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 .
AK501323
1
2
AB
A-107 (B)
Harness side
connector
Connector: A-107
AK501323
1
2
AB
A-107 (B)
Harness side
connector
Connector: A-107
AK501323
1
2
AB
A-107 (B)
Harness side
connector
Connector: A-107
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