MPI <4G6> -
Troubleshooting
13A-42
Code No. P0551 Power steering fluid pressure switch
system
Probable cause
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.
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>
NG
Repair
Replace the engine-ECU
<M/T> or engine-AT-
OK
NG
Check the harness wire
between engine-ECU
<M/T> or engine-AT-
steering pressure switch
connector.
OK
Check trouble symptom.
OK
Replace
the
engine-ECU
<M/T>
or
engine-A/T
-ECU
<A/T>.
OK
Check trouble symptom.
Repair
NG
OK
Check the following
connector:
B-76
NG
Repair
NG
Check the following
connector:
C-36 <M/T>,
OK
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
Check the following connector:
B-76
NG
Repair
OK
Transient malfunction (Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NG
Check the power steering pressure switch.
(Refer to GROUP 37A - On-vehicle Service.)
NG
Replace
MUT-
II
Data list
27 Power steering fluid pressure switch
(Refer to P.13A-75, DATA LIST REFERENCE TABLE.)
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