Yamaha YZF-R1 Series Service Manual page 459

The oil pressure and coolant temperature warning light remains on after the engine is started.
1. Check the entire signaling sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
2. Measure the engine oil pressure.
Refer to "MEASURING THE EN-
GINE OIL PRESSURE" on page
3-30.
OK ↓
Replace the oil pressure switch.
The fuel level warning light fails to come on.
1. Check the fuel sender.
Refer to "CHECKING THE FUEL
SENDER" on page 8-47.
OK ↓
2. Check the entire signaling sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the meter assembly.
The oil pressure and coolant temperature warning light fails to come on.
1. Check the coolant temperature sen-
sor.
Refer to "CHECKING THE COOL-
ANT TEMPERATURE SENSOR"
on page 8-48.
OK ↓
2. Check the entire signaling sys-
tem's wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the ECU or meter assembly.
Refer to "REPLACING THE ECU (En-
gine Control Unit)" on page 8-41.
SIGNALING SYSTEM
NG →
Properly connect or replace the wiring har-
ness.
NG →
Check the engine oil leakage, oil viscosity,
oil seal, oil filter, or oil pump.
NG →
Replace the fuel pump assembly.
NG →
Properly connect or repair the signaling
system's wiring.
NG →
Replace the coolant temperature sensor.
NG →
Properly connect or replace the wiring har-
ness.
8-24