Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 388

MUT-II Data list
74 Fuel pressure sensor
Ignition switch: ON
OK: 0 – 8 MPa
NG
Measure at the fuel pressure sensor
connector A-83.
Connect the connector. (Use test
harness MB991348)
Voltage between 2 and earth
OK: 3 V or less
(Engine: Cranking)
0.3 – 4.7 V (Engine: Idling)
OK
Measure at the engine-ECU connector
B-31.
Connect the connector.
Voltage between 74 and earth
(Engine: idling)
OK: 0.3 – 4.7 V
OK
Check the following connectors:
A-83, B-31
OK
Check trouble symptom.
NG
Replace the engine-ECU.
GDI –
Troubleshooting
OK
MUT-II Data list
74 Fuel pressure sensor
Maintain the engine speed at 2,000
r/min for at least fifteen seconds.
OK: 6.9 MPa or less
MUT-II Data list
74 Fuel pressure sensor
Engine: Idle running for at least
three minutes
OK: 4 MPa or more
Erase diagnosis code No.56. (This
diagnosis code has been output due to
air sucking into high-pressure fuel line.
But that problem has been resolved by
revving the engine at 2,000 r/min.)
Check trouble symptom.
Normal
NG
Measure at the fuel pressure sensor
connector A-83.
Disconnect the connector, and
measure at the harness side.
Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
Continuity between 3 and earth
OK: Continuity
OK
Check the following connectors:
A-83, B-31
OK
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU and the fuel pressure sen-
sor, and repair if necessary.
NG
Repair
NG
OK
NG
OK
NG
OK
NG
NG
Repair
NG
13A-29
Replace the high-pressure fuel
regulator (seized regulator).
Replace the high-pressure return
pipe (seized pipe).
Replace the fuel pump (high
pressure) (poor pump discharge
pressure)
Replace the high-pressure regula-
tor (fuel leakage at the return side).
Check if input voltage from the fuel
pressure sensor to engine-ECU
changes suddenly by performing an
intermittent malfunction simulation test.
(Refer to GROUP 00 – Points to Note
for Intermittent Malfunction.)
Check the following connector:
B-31
OK NG
Repair
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU and the fuel pressure sen-
sor.
OK
NG
Repair
Replace the engine-ECU.
Check the harness wire between the
engine-ECU and the fuel pressure sen-
sor.
OK
NG
Repair
Replace the fuel pressure sensor.