Mitsubishi FUEL Manual page 227

Code No. P0190 Abnormal fuel pressure
Range of Check
D Ignition switch: ON
Set Conditions
D The sensor output voltage is 4.8 V or more, or 0.2 V or less for four
seconds.
Range of Check
D The following conditions are detected temporarily after the engine has been
started.
(1) Engine speed: 1,000 r/min or more
(2) Fuel pressure: 2 MPa or more
D Engine running
Set Conditions
D The fuel pressure is 6.9 MPa or more, or 2 MPa or less for four seconds.
This diagnosis code will also be output when air is trapped into the
high-pressure fuel lines (such as poor fuel level). In that case, the air can be
evacuated by operating the engine for at least 15 seconds at 2,000 r/min. After
the repair, use the MUT-II to erase the diagnosis code.
MUT-II Data list
74 Fuel pressure sensor (Refer to
13I-98, DATA LIST REFERENCE
TABLE.)
NG
Check the following connector:
B-101
OK
Measure at fuel pressure sensor
connector B-101.
D Disconnect the connector, and
measure at the harness side.
(1) Voltage between terminal 1 and
earth (Ignition switch: ON)
OK: 4.8 - 5.2 V
(2) Resistance between terminal 3
and earth
OK: 2 W or less
OK
To the next page
GDI -
Troubleshooting
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Repair
(1) NG
Measure at engine-ECU connector
C-164 <M/T> or engine-A/T-ECU
connector C-175 <A/T>.
D Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
D Ignition switch: ON
D Voltage between terminal 41
<M/T>, 87 <A/T> and earth
OK: 4.8 - 5.2 V
Check the following connectors:
C-164 <M/T>, C-175 <A/T>
Check the harness wire between the
fuel pressure sensor connector and
the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the trouble symptoms.
(2) NG
Check the following connectors:
C-163 <M/T>, C-175 <A/T>
Check the harness wire between the
fuel pressure sensor connector and
the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the trouble symptoms.
Probable cause
D Malfunction of fuel pressure sensor
D Open or short circuit in the fuel pressure sensor
circuit or loose connector contact
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>
D Malfunction of high-pressure fuel pump
D Clogging of high-pressure fuel lines
D Air trapped due to poor fuel level
OK
NG
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
13I-33
Check the following connector:
C-164 <M/T>, C-175 <A/T>
OK NG
Check the harness wire between the
fuel pressure sensor connector and
the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Repair