Mitsubishi L200. Manual — part 65
TROUBLESHOOTING
DIESEL FUEL
13A-56
Code No. P0073: Intake Air Temperature Sensor No. 2 Circuit High Input <Except Euro5>
OPERATION
• A power voltage of 5 V is applied to the intake air
temperature sensor No. 2 output terminal (termi-
nal No. 1) from the engine-ECU (terminal No. 38).
• The power voltage is earthed to the engine-ECU
(terminal No. 32) from the intake air temperature
sensor No. 2 (terminal No. 2).
FUNCTION
• The intake air temperature sensor No. 2 converts
the intake air temperature into a voltage and
inputs the voltage signal to the engine-ECU.
• In response to the signal, the engine-ECU cor-
rects the fuel injection amount, etc.
• The intake air temperature sensor No. 2 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 temperature, and becomes lower as the
intake air 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.
Judgment Criterion
• The intake air temperature sensor No. 2 output
voltage is 4.9 V or more (the intake air tempera-
ture is below
−40°C or equivalent) for 0.5 second.
PROBABLE CAUSES
• Failed intake air temperature sensor No. 2
• Open circuit in intake air temperature sensor No.
2 circuit or loose connector contact
• Failed engine-ECU
AKA00091
1 2
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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
AB
32
38
Intake air temperature
sensor No. 2
Engine-ECU
2
1
Intake Air Temperature Sensor No. 2 Circuit
B-P
L-R
A-136
(MU802409)
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: Gray
R: Red P: Pink V: Violet PU: Purple SI: Silver
TROUBLESHOOTING
DIESEL FUEL
13A-57
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 8: Intake air temperature sensor No. 2
OK: At ambient temperature (atmospheric
temperature) 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-136 intake air
temperature sensor No. 2 connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check intake air temperature sensor No.
2 itself.
• Check intake air temperature sensor No. 2 itself
(Refer to
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the intake air temperature sensor
No. 2.
STEP 4. Perform voltage measurement at A-136
intake air temperature sensor No. 2 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.
AK501317
1
2
AB
A-136 (B)
Harness side
connector
Connector: A-136
AK501317
1
2
AB
A-136 (B)
Harness side
connector
Connector: A-136
AKA00089
1
2
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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-58
STEP 6. Check harness between A-136 (terminal
No. 1) intake air temperature sensor No. 2
connector and C-105 (terminal No. 38) engine-
ECU connector.
• Check output line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
STEP 7. M.U.T.-III data list
• Item 8: Intake air temperature sensor No. 2
OK: At ambient temperature (atmospheric
temperature) 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 :
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 8. Perform resistance measurement at A-
136 intake air temperature sensor No. 2
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 7 .
NO :
Go to Step 9 .
AK501317
1
2
AB
A-136 (B)
Harness side
connector
Connector: A-136
AKA00089
1
2
3
4
5
6
7
8
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95
96
C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
AK501317
1
2
AB
A-136 (B)
Harness side
connector
Connector: A-136
TROUBLESHOOTING
DIESEL FUEL
13A-59
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-136 (terminal
No. 2) intake air temperature sensor No. 2
connector and C-105 (terminal No. 32) engine-
ECU connector.
• Check earthing line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
Code No. P0088: Common Rail High Pressure Malfunction
OPERATION
• 5 V power is supplied from the engine-ECU (ter-
minal No. 70) to the rail pressure sensor (terminal
No. 1).
• The rail pressure sensor (terminal No. 3) is
earthed to the engine-ECU (terminal No. 88).
• Sensor signals are input from the rail pressure
sensor (terminal No. 2) to the engine-ECU (termi-
nal No. 64).
FUNCTION
• The engine-ECU monitors the signals input from
the rail pressure sensor.
AKA00089
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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
AK501317
1
2
AB
A-136 (B)
Harness side
connector
Connector: A-136
AKA00089
1
2
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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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