Mitsubishi Grandis. Manual — part 713
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-103
TROUBLE JUDGMENT
Check Conditions
• 60 seconds have elapsed since the previous
monitoring started.
• Engine coolant temperature is 20°C or higher.
• While cylinder 2, 3 oxygen sensor (rear) heater is
on.
• Battery positive voltage is 11 − 16 V.
Judgment Criterion
• Cylinder 2, 3 oxygen sensor (rear) heater
currents have continued to be 0.16 A or lower, or
5.0 A or higher for 4 seconds.
PROBABLE CAUSE
• Failed cylinder 2, 3 oxygen sensor (rear) heater
• Open/short circuit in cylinder 2, 3 oxygen sensor
(rear) heater circuit or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-18 cylinder 2, 3
oxygen sensor (rear) connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform resistance measurement at B-18
cylinder 2, 3 oxygen sensor (rear) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal No. 1 and No. 3.
OK: 11
− 18 Ω
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace cylinder 2, 3 oxygen sensor (rear).
AK300977
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4
AC
Connector: B-18
Harness side
connector
B-18 (B)
Cylinder 2, 3
oxygen sensor
(rear)
AK300977
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2
3
4
AC
Connector: B-18
Harness side
connector
B-18 (B)
Cylinder 2, 3
oxygen sensor
(rear)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-104
STEP 3. Perform voltage measurement at B-18
cylinder 2, 3 oxygen sensor (rear) 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 .
STEP 4. Connector check: B-15X engine control
relay connector
Q: Is the check result normal?
YES :
Check intermediate connector C-116, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-18 (terminal No. 1)
cylinder 2, 3 oxygen sensor (rear) connector
and B-15X (terminal No. 1) engine control
relay connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
AK300977
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2
3
4
AC
Connector: B-18
Harness side
connector
B-18 (B)
Cylinder 2, 3
oxygen sensor
(rear)
AK300967
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1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300977
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2
3
4
AC
Connector: B-18
Harness side
connector
B-18 (B)
Cylinder 2, 3
oxygen sensor
(rear)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-105
STEP 5. Perform voltage measurement at C-110
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T>.
• Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage.
• Ignition switch: ON
• Voltage between terminal No. 18 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
STEP 6. Connector check: 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 7 .
NO :
Repair or replace.
AK305618AB
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Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
AK305618AB
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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-106
STEP 7. Check harness between B-18 (terminal
No. 3) cylinder 2, 3 oxygen sensor (rear)
connector and C-110 (terminal No. 18)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check earthing line for open/short circuit.
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Repair.
STEP 8. Connector check: 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 9 .
NO :
Repair or replace.
AK300977
1
2
3
4
AC
Connector: B-18
Harness side
connector
B-18 (B)
Cylinder 2, 3
oxygen sensor
(rear)
AK305618AB
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2
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Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
AK305618AB
1
2
3
4
5
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11
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Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
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