Checking The Air Induction System Solenoid; Checking The Intake Air Pressure Sensor - Yamaha SR400 2014 Service Manual

Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
blue "1"
• Negative tester probe 
black/blue "2"
2
b. Check the throttle position sensor maximum
resistance.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
3. Install:
• Throttle position sensor
TIP
When installing the throttle position sensor, ad-
just its angle properly. Refer to "ADJUSTING
THE THROTTLE POSITION SENSOR" on page
6-12.
EAS28371
CHECKING THE AIR INDUCTION SYSTEM
SOLENOID
1. Check:
• Air induction system solenoid resistance
Out of specification  Replace.
Air induction system
Solenoid resistance
20–24 
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the air induction system solenoid
coupler from the air induction system sole-
noid.
b. Connect the pocket tester (  10) to the air
induction system solenoid terminals as
shown.
1
7-71
ELECTRICAL COMPONENTS
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe 
red/white "1"
• Negative tester probe 
brown/red "2"
2
c. Measure the air induction system solenoid re-
sistance.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS28411
CHECKING THE INTAKE AIR PRESSURE
SENSOR
1. Check:
• Intake air pressure sensor output voltage
Out of specification  Replace.
Intake air pressure sensor output
voltage
1.20–4.20 V
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Connect the test harness S– pressure sensor
(3P) "1" to the intake air pressure sensor "2"
and wire harness "3".
b. Connect the digital circuit tester (DCV) to the
test harness S– pressure sensor (3P).
Digital circuit tester
90890-03174
Model 88 Multimeter with tachom-
eter
YU-A1927
Test harness S– pressure sensor
5S7 (3P)
90890-03211
Test harness S– pressure sensor
5S7 (3P)
YU-03211
1