Mitsubishi Colt Ralliart. Manual — part 44
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-130
Code No. P0325: Detonation Sensor System
OPERATION
• A power voltage of 5 V is applied to the detona-
tion output terminal (terminal No. 2) from the
engine-ECU <M/T> or engine-CVT-ECU <CVT>
(terminal No. 20).
• The power voltage is earthed to the engine-ECU
<M/T> or engine-CVT-ECU <CVT> (terminal No.
21) from the detonation sensor (terminal No. 1).
FUNCTION
• The detonation sensor detects the vibration of the
cylinder block caused by detonation waves, and
inputs a signal to the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
• In response to the signal, the engine-ECU <M/T>
or engine-CVT-ECU <CVT> provides controls to
retard the ignition timing when the detonation
occurs.
TROUBLE JUDGMENT
Check Conditions
• After 2 seconds have passed since the engine
starting sequence was completed.
• The engine speed is above 2,500 r/min <M/T>.
• The intake manifold pressure is above specified
value <M/T>.
Judgment Criterion
• When change in detonation sensor output volt-
age is feeble for 200 consecutive times.
PROBABLE CAUSES
• Failed detonation sensor
• Open/short circuit in detonation sensor circuit or
loose connector contact
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
AK402688
1 2
19
21
20
18
17
16
15
14
1213
11
8 9
L
10
37
52 53 54 555657585960616263646566
38 39 404142434445464748495051
22 23 24 252627282930313233343536
7
5
3
1
6
4
2
20
21
Detonation sensor
B
R
2
1
A-128
A-114
Detonation Sensor Circuit
AC
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
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
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-131
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-128 detonation
sensor connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Perform resistance measurement at
A-128 detonation 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 4 .
NO :
Go to Step 3 .
STEP 3. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Check and repair harness between A-128
(terminal No. 1) detonation sensor
connector and A-114 (terminal No. 21)
engine-ECU connector or engine-CVT-ECU
connector.
NO :
Repair or replace the connector.
AK402014
1
2
AC
Connector: A-128
A-128
A-128 Harness side
connector
AK402014
1
2
AC
Connector: A-128
A-128
A-128 Harness side
connector
AK402745
6
4
2
5
3
1
9
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50
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52
53
54
55
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58
59
60
61
62
63
64
65
66
L
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
AK402014
1
2
AC
Connector: A-128
A-128
A-128 Harness side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-132
STEP 4. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5. Check harness between A-128 (terminal
No. 2) detonation sensor connector and A-114
(terminal No. 20) engine-ECU connector or
engine-CVT-ECU connector
• Check output line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
STEP 6. M.U.T.-III diagnosis code.
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Go to Step 7 .
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/Inspection
Service Points
− How to Cope with
Intermittent Malfunctions
).
AK402745
6
4
2
5
3
1
9
7
8
10
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50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
AK402014
1
2
AC
Connector: A-128
A-128
A-128 Harness side
connector
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
20
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50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-133
STEP 7. Reconfirm the diagnosis code after
replacing the detonation sensor.
• Reconfirm the diagnosis code after replacing the
detonation sensor.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Check end.
Main
Index
Group
TOC
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