Mitsubishi FUEL Manual page 140

13A-140
Code No. P0551 Power steering fluid pressure switch
system
Check Area
D Intake air temperature is - 10_C or higher.
D Barometric pressure is 76 kPa or higher.
D Engine coolant temperature is 30_C or more.
D Repeat *1 drive and *2 stop ten times or more.
*1: Engine speed is 2,500 r/min or higher, volumetric efficiency is 55 % or higher
and vehicle speed is 5 km/h or higher for 4 seconds or more.
*2: Vehicle speed is 1.5 km/h or lower.
Judgment Criteria
D Power steering pressure switch remains on.
MUT-II Data list
27 Power steering fluid pressure switch
(Refer to P.13A-176, DATA LIST REFERENCE TABLE.)
Check the power steering pressure switch.
(Refer to GROUP 37A - On-vehicle Service.)
Check the following connector: B-76
Measure at the power steering pressure switch connector
B-76.
D Disconnect the connector and measure at the harness
side.
D Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
OK
Replace the engine-ECU.
MPI <6A1> -
NG
OK
OK
Troubleshooting
Probable cause
D Power steering fluid pressure switch failed.
D Open or shorted power steering fluid pressure
switch circuit, or loose connector.
D Engine-ECU failed.
OK
Transient malfunction (Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
Replace
NG
Repair
NG
Check the following
connector: C-167
OK
Check trouble symptom.
NG
Check the harness wire
between engine-ECU
and power steering
pressure switch
connector.
OK
Replace the engine-
ECU.
NG
Repair
NG
Repair