Mitsubishi L200. Manual — part 67
TROUBLESHOOTING
DIESEL FUEL
13A-64
• Failed rail pressure sensor.
• Harness damage in rail pressure sensor circuit or
loose connector contact.
• Failed engine-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0093 set?
YES :
Inspection chart for diagnosis codes (Refer
to
NO :
Go to Step 2 .
STEP 2. Detection of fuel line leakage
• Check whether fuel is leaking from a high-pres-
sure fuel line.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the parts of an abnormal location.
STEP 3. Release the air from the fuel line.
• After releasing the air from the fuel line, continue
idle operation for about five minutes and recheck
for trouble symptoms.
Q: Does the trouble symptom persist?
YES :
Go to Step 4 .
NO :
The check is end.
STEP 4. Connector check: A-44 rail pressure
sensor connector and C-105 engine-ECU
connector.
Q: Are the check results normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
AK501327
1
2
3
AB
A-44 (B)
Harness side
connector
Connector: A-44
AKA00089
1
2
3
4
5
6
7
8
9
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64
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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
TROUBLESHOOTING
DIESEL FUEL
13A-65
STEP 5. Check harness between A-44 (terminal
No. 1) rail pressure sensor connector and C-105
(terminal No. 70) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-131, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
STEP 6. Check harness between A-44 (terminal
No. 2) rail pressure sensor connector and C-105
(terminal No. 64) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-131, and repair if necessary.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
AK501327
1
2
3
AB
A-44 (B)
Harness side
connector
Connector: A-44
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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64
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72
43
44
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73
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84
85
86
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88
89
90
91
92
93
94
95
96
C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
AK501327
1
2
3
AB
A-44 (B)
Harness side
connector
Connector: A-44
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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64
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72
43
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48
73
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79
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83
84
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86
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89
90
91
92
93
94
95
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-66
STEP 7. Check harness between A-44 (terminal
No. 3) rail pressure sensor connector and C-105
(terminal No. 88) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-131, and repair if necessary.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair the damaged harness wire.
STEP 8. Detection of fuel leakage from injector
body
• Remove the injector. Check whether there is the
evidence of the fuel leakage from the injector
body.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Replace the abnormal injector. After
replacing the injector, register the injector
identification code and learn fuel injection.
(Refer to GROUP 00
− Precautions Before
Service
− What The Common Rail Engine
Learns ).
STEP 9. Replace the common rail assembly and
fuel injection tubes.
• After replacing the common rail assembly and
fuel injection tubes, re-check the trouble symp-
toms.
Q: Does the trouble symptom persist?
YES :
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,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
NO :
The check is end.
AK501327
1
2
3
AB
A-44 (B)
Harness side
connector
Connector: A-44
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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85
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89
90
91
92
93
94
95
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-67
Code No. P0102: Air flow Sensor Circuit Low Input
OPERATION
• Power is supplied by the engine control relay (ter-
minal No. 3) to the air flow sensor (terminal No.
5), and the air flow sensor (terminal No. 4) is
earthed through the engine-ECU (terminal No.
155).
• The air flow sensor (terminal No. 3) outputs a
sensor signal, which is input into the engine-ECU
(terminal No. 140).
AKA00355
1
2
3
4
101 102
103104 105 106107 108109 110 111112 113 114115
118119 120 121122 123124 125126127 128 129130
131132 133 134135 136137 138139140 141142 143
146147 148 149150 151152 153154155 156 157158
117
145
116
144
101 102
103104 105 106107 108109 110 111112 113 114115
118119 120 121122 123124 125126127 128 129130
131132 133 134135 136137 138139140 141142 143
146147 148 149150 151152 153154155 156 157158
117
145
116
144
5
4
3
2
1
W-R
W-B
W-B
W-B
Fusible link
BR-B
W-R
R
A-20X
Engine
control
relay
Relay
box
Air flow sensor
Engine-ECU
140
3
155
5
4
1
3
A-115
4
3
2
Air Flow Sensor Circuit
C-103
A-135
AB
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
To engine-ECU
OFF
ON
5 V
10
23
20A
Heat
sensitizing
resistance
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