Service Manual

SiUS281811E Check
Part 6 Service Diagnosis 273
5.11 Pressure Sensor Check
CHECK 12
Voltage Measurement Point of the High Pressure Sensor
Voltage Measurement Point of the Low Pressure Sensor
High Pressure (PH)
Low Pressure (P
L)
Output Voltage VH, VL
Detected Pressure
40.8
35.7
30.6
25.5
20.4
15.3
10.2
5.1
–5.1–72.5
0
45.9
51.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
–0.5
0 0.5 1 1.5 2 2.5 3 3.5 4
(VDC)
(kg/cm
2
)(psi) (MPa)
P
H, PL
PH (MPa) = × VH – × 0.5
P
L (MPa) = × VL – × 0.5
P
H : High pressure (MPa)
P
L : Low pressure (MPa)
V
H : Output Voltage (High Side) (VDC)
V
L : Output Voltage (Low Side) (VDC)
4.15
3.0
4.15
3.0
1.7
3.0
1.7
3.0
1 MPa = 145 psi
725
653
580
508
435
363
290
218
145
72.5
0
+5 V
(4)
(3)
(2)
(1)
Red
Black
White
X17A
(red)
High
pressure
sensor
Microcomputer
A/D input
Measure DC voltage between these wires.
Main PCB (A1P)
+5 V
(4)
(3)
(2)
(1)
Microcomputer
A/D input
Measure DC voltage between these wires.
X18A
(blue)
Red
Black
White
Low
pressure
sensor
Main PCB (A1P)