Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 116

INSPECTION PROCEDURE 28
Fuel pump system
The engine-ECU <M/T> or engine-A/T-ECU <A/T> turns the control relay ON when
the engine is cranking or running, and this supplies power to drive the fuel pump.
MUT-II Actuator test
07 Fuel pump (Refer to P.13D-62.)
NG
Check the fuel pump relay. (Refer to
P.13D-86.)
OK
Measure at fuel pump relay connector
A-15X.
D Disconnect the connector, and
measure at the harness side.
D Voltage between terminals 3, 4 and
earth
(Ignition switch: ON)
OK: System voltage
OK
Measure at the engine-ECU
connector B-54 <M/T> or the
engine-A/T-ECU connector B-113
<A/T>.
D Disconnect the connector, and
measure at the harness side.
D Voltage between terminal 8 <M/T>,
21 <A/T> and earth (Ignition switch:
ON)
OK: System voltage
OK
Measure at the engine-ECU
connector B-54 <M/T> or the
engine-A/T-ECU connector B-113
<A/T>.
D Disconnect the connector, and
measure at the harness side.
D Short circuit between terminal 8
<M/T>, 21 <A/T> and earth (Ignition
switch: ON)
OK: The fuel pump operates (its
operation sound can
heard).
NG
Measure at fuel pump (low pressure)
connector C-20.
D Disconnect the connector, and
measure at the harness side.
(1) Voltage between terminal 5 and
earth
(Ignition switch: ON)
OK: System voltage
(2) Continuity between 4 and earth
OK: Continuity
OK
Check the following connector:
C-20
OK
Check trouble symptom.
MPI -
Troubleshooting
OK
Normal
NG
Replace
NG
Check the following connectors:
B-13, B-89, B-103
Check trouble symptom.
NG
Check the following connector:
A-15X
OK
Check trouble symptom.
OK
Check the following connector:
B-54 <M/T>, B-113 <A/T>
Check trouble symptom.
be
(1) NG
Check the following connectors:
A-15X, B-13, C-34, B-49 <LHD>, B-65
<RHD>
Check trouble symptom.
(2) NG
Check the following connector:
C-34
OK
Check trouble symptom.
NG
Repair
NG
Replace the fuel pump.
Probable cause
D Malfunction of the fuel pump relay
D Malfunction of the fuel pump
D Improper connector
short-circuited harness wire
D Malfunction
engine-A/T-ECU <A/T>
NG
OK
NG
NG
Repair
NG
NG
OK
NG
NG
OK
NG
NG
Repair
NG
13D-51
contact, open circuit
of the engine-ECU <M/T>
Repair
Check the harness wire between the
fuel pump relay and ignition switch.
OK
NG
Repair
Check the ignition switch. (Refer to
GROUP 54 - Ignition Switch and Immo-
bilizer System.)
Check the harness wire between the
fuel pump relay and engine-ECU <M/T>
or engine-A/T-ECU <A/T>, and repair
if necessary.
Repair
Replace the engine-ECU <M/T> or en-
gine-A/T-ECU <A/T>.
Repair
Check the harness wire between the
fuel pump relay and fuel pump, and
repair if necessary.
Check the harness wire between the
fuel pump and earth, and repair if neces-
sary.
or
or