Mitsubishi Grandis. Manual — part 725
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-151
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
Code No. P0304: No. 4 Cylinder Misfire Detected
OPERATION
• Refer to Code No. P0204 No. 4 Injector System
.
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU <M/T> or engine-A/T-ECU
<A/T> checks for such changes in engine speed.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is 500 − 6,500 r/min.
• Engine coolant temperature is −10°C or higher.
• Barometric pressure is 76 kPa or higher.
• Volumetric efficiency is between 30% and 55 %.
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear
shifting, deceleration, sudden
acceleration/deceleration and A/C compressor
switching.
• The throttle deviation is −0.06 V/10 ms to +0.06
V/10 ms.
Judgment Criteria (change in the angular
acceleration of the crankshaft is used for
misfire detection).
• Misfire has occurred more frequently than the
limit during the last 200 revolutions (when the
catalyst temperature has been 950
°C or higher).
or
• Misfire has occurred 15 times or more in the last
1,000 revolutions (that has been equivalent to
approximately 1.5 times the emission standard).
PROBABLE CAUSE
• Ignition system related part(s) failed
• Low compression pressure
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. Check the ignition coil spark.
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Check ignition Circuit System (Refer to
Inspection Procedure 26
STEP 2. Connector check: B-105 No. 4 injector
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace.
STEP 3. Check No. 4 injector itself.
• Check Injector itself (Refer to
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace No. 4 injector.
AK300978
M
1
2
AM
B-105 (GR)
Harness side connector
Connector: B-105
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-152
STEP 4. Connector check: B-15X engine control
relay connector and C-110 engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace.
STEP 5. Check harness between B-15X (terminal
No. 1) engine control relay connector and B-105
(terminal No. 1) No. 4 injector connector.
NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair.
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK305618AB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300978
M
1
2
AM
B-105 (GR)
Harness side connector
Connector: B-105
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-153
STEP 6. Check harness between B-105 (terminal
No. 2) No. 4 injector connector and C-110
(terminal No. 21) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
STEP 7. Fuel pressure measurement.
• Fuel pressure measurement (Refer to Fuel
Pressure Test
)
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair.
STEP 8. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service
Points
AK300978
M
1
2
AM
B-105 (GR)
Harness side connector
Connector: B-105
AK305618AB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-154
Code No. P0325: Detonation Sensor System
OPERATION
• The sensor signal is inputted to the engine-ECU
<M/T> or engine-A/T-ECU <A/T> (terminal No.
89) 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-A/T-ECU <A/T>.
• In response to the signal, the engine-ECU <M/T>
or engine-A/T-ECU <A/T> 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.
• Engine speed is 2,500 r/min or higher.
Judgment Criterion
• Change of detonation sensor output voltage
(detonation sensor peak voltage in each 1/2 turn
of the crankshaft) has not been 0.06 V or more in
the last consecutive 200 periods.
PROBABLE CAUSE
• Failed detonation sensor
• Open/short circuit in detonation sensor circuit or
loose connector contact
2
1
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
AK305600
89
Detonation sensor
W
B
B
2
1
B-24
MU802661
C-112
(MU803804)
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
Detonation sensor circuit
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: Gray
R: Red P: Pink V: Violet
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