Yamaha ROADLINER XV19SW, Service Manual

Page: 393 / 444

FUEL INJECTION SYSTEM
7-49
Fault code No. 26 Symptom Cylinder-#2 intake air pressure sensor: hose system mal-
function (clogged or detached hose).
Diagnostic code No. 04 Cylinder-#2 intake air pressure sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Cylinder-#2 intake air pressure sensor
hose • Check the cylinder-#2 intake air
pressure sensor hose condition.
• Repair or replace the sensor
hose.
Starting the en-
gine and oper-
ating it at idle.
2 Cylinder-#2 intake air pressure sensor
malfunction at intermediate electrical
potential. • Check and repair the connec-
tion.
• Replace it if there is a malfunc-
tion.
3 Connections
• Cylinder-#2 intake air pressure sen-
sor coupler
• Main wire harness ECU coupler
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
4 Defective cylinder-#2 intake air pres-
sure sensor. • Execute the diagnostic mode.
(Code No.04)
• Replace if defective.
Refer to “CHECKING THE IN-
TAKE AIR PRESSURE SEN-
SOR” on page 7-90.