Mitsubishi FUEL Manual page 42

13A-42
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 the *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-75, 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 ground (Ignition switch: ON)
OK: Battery positive voltage
OK
NG
Check the following
connector: B-76
OK
Check trouble symptom.
OK
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
MPI <4G6> -
NG
OK
OK
Repair
Troubleshooting
Probable cause
D Power steering fluid pressure switch failed.
D Open or shorted power steering fluid pressure
switch circuit or loose connector
D Malfunction of the engine-ECU <M/T>
D Malfunction of the engine-A/C-ECU <A/T>
OK
Transient malfunction (Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
Replace
NG
Repair
NG
Check the following
connector: C-36 <M/T>,
C-176 <A/T>
OK
Check trouble symptom.
NG
Check the harness wire
between engine-ECU
<M/T> or engine-AT-
ECU <A/T> and power
steering pressure switch
connector.
OK
Replace the engine-ECU
<M/T> or engine-AT-
ECU <A/T>.
NG
Repair
NG
Repair