Yamaha RS90GTZ Service Manual page 351

Fault code No. 26
Diagnostic code No. d:04 (intake air pressure sensor 2 (cylinder #1))
Item/components and probable cause
Order
Intake air pressure sensor 2 (cylinder #1)
1 hose is detached, clogged, kinked, or
pinched.
Defective intake air pressure sensor 2 (cyl-
2 inder #1).
Fault code No. 30
Diagnostic code No. – –
Item/components and probable cause
Order
Oil pressure dropped.
1
Defective oil pressure switch.
2
3 Malfunction in ECU.
Fault code No. 33
Diagnostic code No. d:30 (cylinder-#1 ignition coil)
Item/components and probable cause
Order
Connections
• Cylinder-#1 ignition coil coupler
1 • Wire harness ECU couplers
• Ignition system sub-wire harness cou-
pler
Open or short circuit in wire harness and/or
ignition system sub-wire harness.
2
Detective cylinder-#1 ignition coil.
3
4 Malfunction in ECU.
FUEL INJECTION SYSTEM
Intake air pressure sensor 2 (cylinder #1): hose system malfunction (clogged or
Symptom
detached hose).
Check or maintenance job
Repair or replace the intake air pressure sensor 2
(cylinder #1) hose.
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 CHAP-
TER 2.
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.
Replace the ECU.
Symptom Malfunction detected in the primary lead of the cylinder-#1 ignition coil.
Check or maintenance job
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.
Repair or replace if there is an open or short circuit.
Between the cylinder-#1 ignition coil coupler and
ECU couplers.
Orange – Orange
Red/White – Red/White
Execute the diagnostic mode (code No. d:30).
Test the primary and secondary coils for continuity.
Replace if defective.
Refer to "IGNITION SYSTEM" in CHAPTER 8.
Replace the ECU.
7-24
FI
Reinstate-
ment method
Starting the
engine and
operating it at
idle.
Reinstate-
ment method
Setting the
engine stop
switch to
"RUN" and
turning the
main switch
ON → OFF →
ON.
Reinstate-
ment method
Starting the
engine and
operating it at
idle.