Mitsubishi Lancer Evolution 7. Manual — part 196
MPI -
Troubleshooting
13A-83
OK
Check and repair the harness and
connector of the ignition switch-IG1
output signal for short-circuit.
NG
OK
Check the harness between the
ignition switch and engine-ECU.
D
Check for disconnection and
short-circuit of the output cable.
Repair
OK
OK
NG
Check the ignition switch. (Refer to
GROUP 54 - Ignition switch.)
Repair
Measure at the C-115 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Ignition switch: ON
D
Voltage between terminal No. 82
and earth
OK: System voltage
NG
Check the following connector:
C-115
NG
Replace the ignition switch.
OK
From the previous page
OK
NG
Check the following connector:
C-126
Repair
OK
NG
Repair
Check the following connectors:
C-129, C-209, C-210, C-201
Check and repair the harness
between the engine control relay and
engine-ECU.
D
Check for disconnection and
short-circuit of the earth cable.
OK
Repair
(1) NG
Check the following connectors:
C-122, B-11X
NG
OK
NG
Replace the engine-ECU.
OK
NG
Check the harness between the
ignition switch and engine-ECU.
D
Check for damage of the output
cable.
Repair
(2) NG
Check the following connectors:
C-122, C-115, C-129, C-209, C-210,
C-201
NG
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
OK
OK
Repair
Check the trouble symptoms.
OK
To the next page
Measure at the C-122 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
(1) Voltage between terminal No. 38
and earth
(Ignition switch: OFF)
OK: System voltage
(2) Voltage between terminal No. 38
and earth
(Ignition switch: ON)
OK: 1 V or less
MPI -
Troubleshooting
13A-84
Check the harness and connector of the engine control relay
output power for short-circuit.
NG
NG
OK
Check the harness between the engine control relay and
engine-ECU.
D
Check for disconnection, short-circuit and damage of the
output cable.
NG
OK
Check the following connector: C-126
NG
Intermittent malfunction (Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
From the previous page
Repair
OK
Repair
Repair
OK
OK
Check the following connector: A-13
NG
Repair
Check the harness between the battery and engine control
relay.
D
Check for damage of the power cable.
NG
OK
Repair
Check the harness between the engine control relay and
engine-ECU.
D
Check for damage of the output cable.
NG
OK
Repair
OK
Check the trouble symptoms.
Replace the engine-ECU.
MPI -
Troubleshooting
13A-85
Inspection Procedure 23
Fuel pump system
Probable cause
D
The engine-ECU turns the fuel pump relay ON during cranking and engine
operation, and supplies the drive power to the fuel pump.
D
When operating with a low load, the engine-ECU supplies power to the fuel
pump via the resistor. When operating with a high load, power is directly
supplied and the fuel pump fuel discharge amount is increased.
D
Fuel pump relay 1 malfunction
D
Fuel pump relay 2 malfunction
D
Fuel pump relay 3 malfunction
D
Fuel pump resistor malfunction
D
Fuel pump malfunction
D
Fuel pump circuit disconnection, short-circuit, or
connector contact defect
D
Engine-ECU malfunction
NG
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
OK
MUT-II Actuator Test
No. 07: Fuel pump
(Refer to P.13A-107.)
NG
MUT-II Actuator Test
No. 13: Fuel pump relay 3
(Refer to P.13A-107.)
OK
NG
Replace the fuel pump relay 3.
NG
NG
Repair
Check the fuel pump relay 1, fuel
pump relay 2 and fuel pump registor.
(Refer to P.13A-132.)
OK
Measure at the B-140 fuel pump
relay 3.
D
Disconnect the connector to
measure at the harness side.
D
Voltage between terminal No. 2,
terminal No. 4 and earth
(Ignition switch: ON)
OK: System voltage
NG
OK
Check the fuel pump relay 3.
(Refer to P.13A-132.)
OK
Check and repair the harness
between the fuel pump resistor and
fuel pump relay 3.
OK
NG
Repair
OK
NG
Check the trouble symptoms.
Repair
OK
Check the harness between the fuel
pump relay 3 and fuel pump resistor.
Replace the engine-ECU.
Check and repair the harness
between the fuel pump relay 3 and
engine-ECU.
Check the following connector: C-122
Measure at the C-122 engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Disconnect the C-126
engine-ECU connector, and earth
the terminal No. 22.
D
Voltage between terminal No. 126
and earth
(Ignition switch: ON)
OK: System voltage
NG
OK
Check the following connectors:
C-209, C-135
(1) NG
Repair
NG
NG
Check the trouble symptoms.
Check and repair the harness
between the fuel pump relay 1 and
battery.
(2) NG
NG
OK
Check the following connector:
C-210
Repair
NG
Check the trouble symptoms.
OK
Check the following connectors:
C-223, C-08 <R.H. drive vehicle>,
C-102 <L.H. drive vehicle>
(3) NG
NG
Repair
NG
Check and repair the harness
between the fuel pump relay 1 and
body earth.
Check the trouble symptoms.
OK
To the next page
Measure at the C-223 fuel pump
relay 1.
D
Disconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 3
and earth
OK: System voltage
(2) Voltage between terminal No. 1
and earth
(Ignition switch: ON)
OK: Battery voltage
(2) Resistance between terminal No.
4 and earth
OK: 2 Ω or less
Repair
OK
Check the ignition switch. (Refer to
GROUP 54 - Ignition Switch.)
Check the harness between the fuel
pump relay 1 and ignition switch.
NG
MPI -
Troubleshooting
13A-86
OK
From the previous page
Check and repair the harness
between the fuel pump relay 1 and
fuel pump relay 2.
OK
NG
Measure at the C-221 fuel pump
relay 2 connector.
D
Disconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 1,
terminal No. 2 and earth
(Ignition switch: ON)
OK: System voltage
Check and repair the harness
between the fuel pump relay 2 and
engine-ECU.
OK
Check the following connector: C-129
OK
Repair
OK
Measure at the C-126 engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Voltage between terminal No. 22
and earth
(Ignition switch: ON)
OK: System voltage
NG
OK
Check the following connector: C-126
Repair
NG
Measure at the C-126 engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Short-circuit between terminal No.
22 and earth
(Ignition switch: ON)
OK: The fuel pump operates.
(Operation sounds are
heard.)
OK
NG
Check the trouble symptoms.
Replace the engine-ECU.
Check and repair the harness
between the fuel pump relay 2 and
fuel pump resistor.
OK
Check the following connector: C-129
Repair
OK
Measure at the B-141 fuel pump
resistor connector.
D
Disconnect the connector to
measure at the harness side.
D
Voltage between terminal No. 1
and earth
(Ignition switch: ON)
OK: System voltage
NG
NG
NG
(1) NG
OK
NG
OK
Check the following connectors:
D-29, C-146, C-129, B-141
Repair
NG
Check the trouble symptoms.
Check and repair the harness
between the fuel pump resistor and
fuel pump.
NG
(2) NG
NG
Measure at the D-09 fuel pump
connector.
D
Disconnect the connector to
measure at the harness side.
(1) Voltage between terminal No. 5
and earth
(Ignition switch: ON)
OK: System voltage
(2) Resistance between terminal No.
4 and earth
OK: 2 Ω or less
OK
NG
Check the trouble symptoms.
Check and repair the harness
between the fuel pump and body
earth.
Check the following connector: D-30
Repair
OK
Check the following connector: D-09
NG
Replace the fuel pump.
Check the trouble symptoms.
Repair
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