Power Steering Pressure Sensor Circuit Malfunction
CIRCUIT DESCRIPTION ECM controls the idle speed the most appropriate according to the signal from the power steering pressure sensor. DTC No.
P0550
DTC Detecting Condition
Trouble Area
Condition (a) or (b) continues with more than 0.5 secs.: (a) PNP < 0.28 V (b) PNP > 4.9 V
Open in power steering pressure sensor circuit Power steering oil pressure sensor ECM
WIRING DIAGRAM
P2 Power Steering Oil Pressure Sensor
VC
VOUT
GND
ECM
3
R-W
3 EC1
R-W
1 E6
VC
2
Y
2 EC1
Y
12 E6
PSP
1
BR
1 EC1
BR
9 E6
E2
I05144
2002 ECHO (RM884U)
Author:
Date:
281
DI-1 12 DIAGNOSTICS
-
ENGINE
INSPECTION PROCEDURE 1
Check power steering oil pressure sensor.
(-) 180 kΩ
PREPARATION: (a) Connect the 3 dry batteries of 1.5 V in series. (b) Connect the wire harness as shown in the illustration. CHECK: Measure voltage between terminals Vout and GND. OK: Power steering fluid pressure
(+)
0 kPa (0 A09071
kgf/cm2,
3,500 kPa (36
0 psi)
kgf/cm2,
512 psi)
7,000 kPa (71 kgf/cm2, 1,010 psi)
NG
Voltage (V) Approx. 0.45 Approx. 2.25 Approx. 4.05
Replace power steering oil pressure sensor.
OK
2
Check for open in harness and connector between ECM and power steering oil pressure sensor (See page IN-29 ).
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