Yamaha XV1700P Service Manual page 418

Code No. 26
Used diagnostic code No. 04 (intake air pressure sensor 2)
No. 01 (throttle position sensor)
No. 02 (atmospheric pressure sensor)
Inspection operation item and probable cause Operation item and countermeasure
1.Common to 1, 2, and 3:
Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
2-1.Intake air pressure sensor hose detached,
clogged, kinked, or pinched.
Intake air pressure sensor malfunction at
intermediate electrical potential.
Atmospheric pressure sensor malfunction
at intermediate electrical potential.
2-2.Open or short circuit in wiring harness or
sub lead.
2-3.Defective intake air pressure sensor.
3-1.Open or short circuit in wiring harness or
sub lead.
3-2.Throttle position sensor lead wire open cir-
cuit output voltage check
(B/L - Y)
Black/Blue - Yellow
3-3.Defective throttle position sensor.
FUEL INJECTION SYSTEM
Symptom 1 Intake air pressure sensor 2 - pipe system malfunction (clogged or
detached hose).
2 Intake air pressure sensor 2 - open or short circuit detected.
3 Stuck throttle position sensor detected.
If there is a malfunction, repair it and connect it
securely.
Intake air pressure sensor coupler
Main wiring harness ECU coupler
Repair or replace the sensor hose.
Inspect and repair the connection.
Replace it if there is a malfunction.
See page 6-25
Repair or replace if there is an open or short
circuit.
Main wiring harness
Black/Blue - Black/Blue
Pink/White - Pink/White
Blue - Blue
Sub lead
Black/Blue - Black/Blue
Pink/White - Pink/White
Blue - Blue
Replace if defective.
Refer to "FUEL INJECTION SYSTEM" in
chapter 7.
Repair or replace if there is an open or short
circuit.
Main wiring harness
Black/Blue - Black/Blue
Yellow - Yellow
Blue - Blue
Sub lead
Black/Blue - Black/Blue
Yellow - Yellow
Blue - Blue
Open circuit item:
Ground wire open circuit:
Output wire open circuit:
Power supply wire open circuit: 0 V
Check for open circuit and replace the throttle
position sensor.
Replace if defective.
Refer to "FUEL INJECTION SYSTEM" in
chapter 7.
6 - 25
FI
Reinstatement
method
Reinstated by
starting the engine
and operating it at
idle.
Reinstated by
starting the engine
and operating it at
idle.
Reinstated by
starting the engine,
operating it at idle,
and then by racing
it.
Output voltage
5 V
0 V