Yamaha RS90GTZ Service Manual page 350

Fault code No. 25
Diagnostic code No. d:04 (intake air pressure sensor 2 (cylinder #1))
Item/components and probable cause
Order
Defective intake air pressure sensor 2 (cyl-
inder #1).
3
4 Malfunction in ECU.
FUEL INJECTION SYSTEM
Symptom Intake air pressure sensor 2 (cylinder #1): open or short circuit detected.
Check or maintenance job
Execute the diagnostic mode (code No. d:04).
Replace if defective.
1. Intake air pressure sensor output voltage
Out of specification → Replace.
2. Connect the test harness S-pressure sensor
(3P)
wire harness as shown.
NOTICE
Pay attention to the installing direction of the
test harness S-pressure sensor (3P) coupler
3. Connect the model 88 multimeter with
tachometer (digital circuit tester) (DCV) to the
test harness S-pressure sensor (3P).
Positive tester probe →
Negative tester probe →
4. Turn the main switch to "ON".
5. Measure the intake air pressure sensor output
voltage.
6. Is the intake air pressure sensor 2 (cylinder #1)
OK?
Replace the ECU.
Intake air pressure sensor 1
(cylinder #1) output voltage
3.57–3.71 V at 101.32 kPa
to the intake air pressure sensor and
Model 88 Multimeter with
tachometer
YU-A1927
Digital circuit tester
90890-03174
Test harness S-pressure sensor (3P)
90890-03207
Pink/Black (wire harness color)
Black/Blue (wire harness color)
7-23
FI
Reinstate-
ment method
Setting the
engine stop
switch to
"RUN" and
turning the
main switch
on.
.