Mitsubishi L200. Manual — part 64
TROUBLESHOOTING
DIESEL FUEL
13A-52
Code No. P0073: Intake Air Temperature Sensor No. 1 Circuit High Input <Euro5>
OPERATION
• A power voltage of 5 V is applied to the intake air
temperature sensor No.1 output terminal (termi-
nal No. 2) of air flow sensor connector from the
engine-ECU (terminal No. 62).
• The power voltage is earthed to the engine-ECU
(terminal No. 86) from the intake air temperature
sensor No. 1 (terminal No. 1).
FUNCTION
• The intake air temperature sensor No. 1 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. 1 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 intake air 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. 1 output
voltage is 4.87 V or more for 0.5 second.
PROBABLE CAUSES
• Failed intake air temperature sensor No. 1
• Open circuit or harness damage in intake air tem-
perature sensor No. 1 circuit or loose connector
contact
• Failed engine-ECU
AKA00356
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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
5
4
3
2
1
86
62
Intake air temperature
sensor No. 1 (integrated in
air flow sensor)
Engine-ECU
1
2
Intake Air Temperature Sensor No. 1 Circuit
B-L
Y-L
A-135
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
5 V
AB
TROUBLESHOOTING
DIESEL FUEL
13A-53
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 43: Intake air temperature sensor No. 1
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-135 air flow sensor
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.
1 itself.
• Check intake air temperature sensor No. 1 itself
(Refer to
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the air flow sensor.
STEP 4. Perform voltage measurement at A-135
air flow sensor No. 1 connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 2 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.
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
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-54
STEP 6. Check harness between A-135 (terminal
No. 2) air flow sensor connector and C-105
(terminal No. 62) 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 43: Intake air temperature sensor No. 1
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 ). 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 ).
STEP 8. Perform resistance measurement at A-
135 air flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 1 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Go to Step 9 .
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
AKA00089
1
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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
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
TROUBLESHOOTING
DIESEL FUEL
13A-55
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-135 (terminal
No. 1) air flow sensor connector and C-105
(terminal No. 86) engine-ECU connector.
• Check earthing line open circuit and damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace the connector.
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
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
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
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