Mitsubishi Lancer Evolution IX. Manual — part 419
![](/vehicles/winoney/wruvea/ger/mengo.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-151
Code No. P0325: Detonation Sensor System
OPERATION
• The sensor signal is inputted to the engine-ECU
(terminal No. 91) from the detonation sensor (ter-
minal 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.
• In response to the signal, the engine-ECU pro-
vides controls to retard the ignition timing when
the detonation occurs.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch: "ON"
• Excluding for 2 seconds after ignition switch is set
to "ON" position or 2 seconds after engine start is
completed.
• The engine speed is 2,000 r/min. or more.
• The volumetric efficiency is 30% or more.
Judgment Criterion
• The change amount of the detonation sensor out-
put voltage (the detonation sensor peak voltage
in every half a turn of the crankshaft) is below
0.06 V or less in 200 consecutive times.
2
1
AK501811
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97
96
100
89
78
71
90
76 77
75
72
79
91
W
B
B
Detonation sensor
2
1
Engine-ECU
Detonation sensor circuit
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
C-117
(MU803783)
AB
B-108
MU802661
![](/vehicles/winoney/wruvea/ger/ppon.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-152
PROBABLE CAUSES
• Failed detonation sensor
• Open/short circuit in detonation sensor circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-108 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
B-108 detonation sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 2 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check and repair harness between B-108
(terminal No. 2) detonation sensor
connector and body earth.
• Check earthing line for open circuit
and damage.
AK305019
1
2
AB
Connector : B-108
Harness side
connector
B-108(GR)
Detonation sensor
AK305019
1
2
AB
Connector : B-108
Harness side
connector
B-108(GR)
Detonation sensor
![](/vehicles/winoney/wruvea/ger/ayordu.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-153
STEP 3. Connector check: C-117 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace the connector.
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
![](/vehicles/winoney/wruvea/ger/ceheeriv.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-154
STEP 4. Check harness between B-108 (terminal
No. 1) detonation sensor connector and C-117
(terminal No. 91) engine-ECU connector.
• Check output line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair the damaged harness wire.
STEP 5. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Go to Step 6 .
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 6. Replace the detonation sensor.
• After replacing the detonation sensor, re-check
the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU.
NO :
The check is end.
AK305019
1
2
AB
Connector : B-108
Harness side
connector
B-108(GR)
Detonation sensor
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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