Mitsubishi Colt Ralliart. Manual — part 688
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-77
STEP 9. Check harness between A-122 (terminal
No. 3) oxygen sensor (front) connector and B-106
(terminal No. 4) engine control relay connector.
NOTE: Before checking harness, check intermediate
connectors A-17 and B-112 and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair.
STEP 10. Check harness between A-122 (terminal
No. 4) oxygen sensor (front) connector and A-114
(terminal No. 51) engine-ECU connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair.
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
3
2
1
4
AK402084
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-78
STEP 11. M.U.T.-III diagnosis code
Q: Is the diagnosis code output?
YES :
Replace engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Code No. P0136: Oxygen Sensor (Rear) System
OPERATION
• The sensor signal is inputted to the engine-ECU
(terminal No. 97) from the oxygen sensor (rear)
output terminal (terminal No. 1).
• The oxygen sensor (rear) (terminal No. 2) is
earthed with engine-ECU (terminal No. 98).
AK600607
3 4
2
1
R
92 93 94 95969798
77 78 79 808182838485868788899091
99
100
107 108 109 110 111112113114115116117118119120121
122 123 124 125126127128129130131132133134135136
101102103104105106
71 72
73 74
75 76
Oxygen sensor (rear)
AB
Oxygen Sensor (rear) Circuit
Y
GR
From engine control relay
4
2
3
1
98
97
B-53
A-08
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
Engine-ECU
To engine-ECU
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-79
FUNCTION
• The oxygen sensor (rear) converts the concentra-
tion of oxygen in the exhaust emission into a volt-
age and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoreti-
cal air-fuel ratio, the oxygen sensor (rear) outputs
a voltage of about 1 V. When it is leaner than the
theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• Based on this signal, the engine-ECU corrects
the deviation in the signal that is output by the
oxygen sensor (rear).
TROUBLE JUDGMENT
Check Conditions
• 3 minutes later from when engine starts
• For 5 seconds, engine coolant temperature is
more than 80
°C.
• For 5 seconds, engine speed is more than 1,200
r/min.
• The volume efficiency for 5 seconds is 50% or
more.
Judgement Criterion
• When 5 V is applied to oxygen sensor (rear) out-
put line via register, engine-ECU-interface output
voltage is more than 4.0 V.
PROBABLE CAUSES
• Failed oxygen sensor (rear)
• Open/short circuit and damage in oxygen sensor
(rear) circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item No. 59: Oxygen sensor (rear)
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: B-53 oxygen sensor
(rear) connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-80
STEP 3. Perform resistance measurement at B-53
oxygen sensor (rear) 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 4 .
STEP 4. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
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