Service manual

7-26
E
– +
ELEC
IGNITION SYSTEM
INTAKE AIR PRESSURE SENSOR
1. Measure:
• Intake air pressure sensor output volt-
age
Out of specification
→
Replace.
È
: Output voltage
É
: Vacuum pressure
NOTE:
When operating the Yamaha Diagnostic Sys-
tem, electric power is supplied to the intake air
pressure sensor.
Test harness (3 pins):
YB-06769/90890-06769
Vacuum/pressure pump gauge
set:
YB-35956-A/90890-06756
Intake air pressure sensor output
voltage:
Pink/green (P/G) –
Black/orange (B/O)
1
101.3 kPa
(1.01 kgf/cm
2
, 14.4 psi):
a
4.00 V
2
50 kPa
(0.5 kgf/cm
2
, 7.1 psi):
b
1.97 V
3
20 kPa
(0.2 kgf/cm
2
, 2.8 psi):
c
0.79 V
Measurement steps:
• Remove the intake air pressure sensor.
• Connect the test harness (3 pins) to the
intake air pressure sensor.
• Operate the Yamaha Diagnostic System.
• Apply vacuum pressure to the intake air
pressure sensor and measure the output
voltage.
B/O
P/G
È
a
b
c
32 1
É