
MPI –
Troubleshooting
13-36
INSPECTION PROCEDURE 25 <EVOLUTION-IV, EVOLUTION-V>
Fuel pump system
Probable cause
The engine-ECU turns the control relay ON when the engine is cranking or running,
and this supplies power to drive the fuel pump.
D
Malfunction of the fuel pump relay
D
Malfunction of the fuel pump
D
Improper connector contact, open or short-circuited
harness wire
D
Malfunction of the engine-ECU
OK
Check the harness wire between resistor connector and fuel pump
drive terminal and between fuel pump relay No.2 connector and
fuel pump drive terminal, and repair if necessary.
OK
Check the resistor. (Refer to P.13-34.)*
NG
Replace
OK
Measure at the resistor connector A-124.
D
Disconnect the connector.
D
Voltage between 1 and earth
D
MUT-
II
Actuator test: Fuel pump relay No.2 drive
OK: System voltage
NG
Check the harness wire between fuel pump relay No.2 and resistor
connector, and repair if necessary.
OK
Measure at the engine-ECU connector B-60.
D
Connect the connector.
D
Voltage between 39 and earth
D
MUT-
II
Actuator test: Fuel pump drive
OK: System voltage
NG
Check the harness wire between fuel pump relay No.2 and
engine-ECU connector, and repair if necessary.
NG
Check the harness wire between fuel pump relay and fuel pump
relay No.2 connector, and repair if necessary.
OK
Measure at the fuel pump relay No.2 connector A-123.
D
Disconnect the connector.
D
Voltage between each of 3 and 5 and earth
D
MUT-
II
Actuator test: Fuel pump drive
OK: System voltage
OK
Check the fuel pump relay No.2. (Refer to P.13-68)
NG
Replace
OK
Check the following connectors:
D-18, D-04, B-64, A-124, A-123, B-59, B-60
NG
Repair
OK
Measure at the fuel pump relay connector B-28.
D
Connect the connector.
D
Voltage between 1 and earth
D
MUT-
II
Actuator test: Fuel pump drive
OK: System voltage
NG
Check the fuel pump drive control circuit.
(Refer to P.13-54, INSPECTION PROCEDURE 47.)
OK
Check the fuel pump relay. (Refer to P.13-68.)
NG
Replace
Check the fuel pump operation by applying the system voltage
to the fuel pump drive terminal.
NG
Check the fuel pump circuit.
(Refer to P.13-53, INSPECTION PROCEDURE 46.)
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).