Yamaha RST90GTY Service Manual page 141

Fault code No. 26
Diagnostic code No. d:04 (intake air pressure sensor 2 (cylinder #1))
Order Item/components and probable cause
1 Intake air pressure sensor 2 (cylinder #1)
hose is detached, clogged, kinked, or
pinched.
2 Intake air pressure sensor 2 (cylinder #1)
malfunction at intermediate electrical
potential.
3 Connections
• Intake air pressure sensor 2 (cylinder #1)
coupler
• Wire harness ECU coupler
4 Defective intake air pressure sensor 2
(cylinder #1).
Fault code No. 30
Diagnostic code No. – –
Order Item/components and probable cause
1 Oil pressure dropped.
2 Short circuit in oil pressure switch lead
and/or oil pressure switch sub-lead.
3 Defective oil pressure switch.
FUEL INJECTION SYSTEM
Intake air pressure sensor 2 (cylinder #1): hose system malfunction
Symptom
(clogged or detached hose).
Check or maintenance job
Repair or replace the intake air pressure sensor 2
(cylinder #1) hose.
Check and repair the connection.
Replace it if there is a malfunction.
Check the couplers for any pins that may have
pulled out.
Check the locking condition of the couplers.
If there is a malfunction, repair it and connect the
coupler securely.
Execute the diagnostic mode (code No. d:04).
Replace if defective.
Refer to "Fault code No. 25".
Symptom Engine stops when an oil pressure drop is detected.
Check or maintenance job
Place the snowmobile on a level surface, and
then check the oil pressure after warming up the
engine.
Refer to "ENGINE OIL REPLACEMENT" in
CHAPTER 2.
Disconnect the ECU coupler, and then use the
circuit tester to check for continuity between the
engine ground and the oil pressure switch cou-
pler (yellow/green).
Repair or replace if there is no continuity.
Start the engine, warm it up for 1 minute, and
then use the circuit tester to check for continuity
between the oil pressure switch coupler (yellow/
green) and the switch body.
Replace if there is continuity.
63
FI
Reinstatement
method
Starting the
engine and
operating it at
idle.
Reinstatement
method
Starting the
engine and
operating it at
idle.