Mitsubishi Grandis. Manual — part 743
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-223
STEP 11. Check and repair harness between
B-12X (terminal No. 4) throttle valve control servo
relay connector and battery.
• Check power supply line for damage.
Q: Is the harness connector in good condition?
YES :
Go to Step 12 .
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 12. Check and repair harness between
B-12X (terminal No. 1) throttle valve control servo
relay connector and C-114 (terminal No. 132)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check power supply line for damage.
Q: Is the harness connector in good condition?
YES :
Go to Step 13 .
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 13. Check the trouble symptoms.
Q: Does trouble symptom persist?
AK300992
2
1
3
4
AC
B-12X
Connector: B-12X
Relay box’s
triangle marks
Harness side
connector
AK300992
2
1
3
4
AC
B-12X
Connector: B-12X
Relay box’s
triangle marks
Harness side
connector
AK305623AB
Connector: C-114
<L.H. drive vehicles>
<R.H. drive vehicles>
C-114 (GR)
C-114 (GR)
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-224
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
).
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-225
Code No. P1021: Oil Control Valve Circuit
OPERATION
• Power is supplied to the oil control valve (terminal
No. 1) from the engine control relay (terminal No.
1).
1
2
3
4
AK305599
1 2
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
6
11
C-116
J/C (4)
AB
Engine
control
relay
R-W
R-W
P-B
B-15X
Oil control
valve
4
3
1
1
2
95
2
Oil control valve circuit
Battery
W-G
W-G
C-113
(MU803805)
B-07
MU802779
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
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
To engine-ECU <M/T> or
engine-A/T-ECU <A/T>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-226
• The engine-ECU <M/T> or engine-A/T-ECU
<A/T> (terminal No. 95) makes the power
transistor in the unit be in ON position, and that
makes currents go on the oil control valve
(terminal No. 2).
FUNCTION
• The oil control valve switches the cams to
operate the MIVEC in the low-speed or
high-speed mode in accordance with the signals
from the engine-ECU <M/T> or engine-A/T-ECU
<A/T>.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is "ON" position
• Battery positive voltage is higher than 10 V.
• MIVEC operating in the low-speed mode.
Judgment Criteria
• The engine-ECU terminal voltage of oil control
valve circuit is less than 1.5 V for 2 seconds.
PROBABLE CAUSE
• Failed purge oil control valve
• Open/short circuit in oil control valve circuit or
loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-07 oil control valve
connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2: Perform resistance measurement at B-07
oil control valve connector.
• Disconnect connector, and measure at control
valve side.
• Resistance between terminal No. 1 and No. 2.
OK: 6.9
− 7.9 Ω (at 20°C)
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace oil control valve.
STEP 3. Perform voltage measurement at B-07 oil
control valve 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 5 .
NO :
Go to Step 4 .
AK300966
1
2
AC
B-07 (B)
Connector: B-07
Harness side connector
AK300966
1
2
AC
B-07 (B)
Connector: B-07
Harness side connector
AK300966
1
2
AC
B-07 (B)
Connector: B-07
Harness side connector
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