Mitsubishi Colt Ralliart. Manual — part 692
![](/vehicles/winoney/ama/flend/wig.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-93
FUNCTION
• The engine-ECU controls the injector activation
time.
• The fuel injection amount from the injector
depends on the injector activation time.
TROUBLE JUDGEMENT
Check Conditions
• Engine speed is more than 50 r/min and is less
than 1,000 r/min.
• Throttle position sensor (main) output voltage is
less than 1.0 V.
• Not during fuel cut or forced injector-driving (actu-
ator test)
Judgement Criterion
• Injector coil surge voltage (battery voltage plus 2
V) is not detected for 4 seconds.
PROBABLE CAUSES
• Failed No. 1 injector
• Open/short circuit or damage in No. 1 injector cir-
cuit, or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 01: No. 1 injector
OK: Idling state varies.
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-102 injector
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace.
STEP 3. Perform resistance measurement at
A-102 injector connector.
• Disconnect connector, and measure at injector
side.
• Resistance between terminals No. 1 and No. 2.
OK: 10.5
− 13.5 Ω (at 20°C)
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace No. 1 injector.
STEP 4. Perform voltage measurement at A-102
injector connector.
• Disconnect connector and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 5 .
AK402088
M
1
2
AC
A-102(G)
Connector: A-102
Harness side
connector
AK402088
M
1
2
AC
A-102(G)
Connector: A-102
Harness side
connector
AK402088
M
1
2
AC
A-102(G)
Connector: A-102
Harness side
connector
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/manane.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-94
STEP 5. Connector check: B-106 engine control
relay connector
Q: Is the check result normal?
YES :
Check intermediate connectors A-17 and
B-112 and repair if necessary. If
intermediate connectors are normal, check
and repair harness between B-106 (terminal
No. 4) engine control relay connector and
A-102 (terminal No.1) injector connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
STEP 6. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace.
3
2
1
4
AK402084
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402088
M
1
2
AC
A-102(G)
Connector: A-102
Harness side
connector
AK402745
6
4
2
5
3
1
9
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66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/nat.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-95
STEP 7. Check harness between B-106 (terminal
No. 4) engine control relay connector and A-102
(terminal No. 1) injector 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 8 .
NO :
Repair.
STEP 8. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace.
3
2
1
4
AK402084
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402088
M
1
2
AC
A-102(G)
Connector: A-102
Harness side
connector
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
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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
![](/vehicles/winoney/ama/flend/can.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-96
STEP 9. Check harness between A-102 (terminal
No. 2) injector connector and A-114 (terminal No.
8) engine-ECU connector.
• Check output line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair.
STEP 10. Perform signal wave pattern
measurement at A-114 engine-ECU connector
(using an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB991987) and measure the voltage on the
check connector.
• Engine: Idling
• Transmission: P range
• Voltage between terminal No. 8 and earth.
OK: Waveforms as shown in Inspection Pro-
cedure with Oscilloscope (Refer to
) should be displayed.
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 engine-ECU.
AK402088
M
1
2
AC
A-102(G)
Connector: A-102
Harness side
connector
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
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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
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
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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
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