Yamaha WaveRunner FZR-GX1800 Service Manual page 393

TRBL
SHTG
Engine unit troubleshooting
Symptom 2
Fuel not supplied (all
cylinders)
Compression
pressure is low
WD: Refer to the wiring diagram.
Cause
Fuel leakage
Blown fuse
Clogged fuel pump filter
Fuel pump module mal-
function
Main and fuel pump relay
malfunction
Fuel not supplied to the
fuel rail
Compression leakage
Improper valve timing
Checking step
Check the fuel hose.
Check the fuse for continuity.
Clean the fuel pump filter.
Check the fuel pump module
operation sound using the YDIS.
Measure the fuel pump module
input voltage.
Check the blue (L) and black (B)
fuel pump module wiring harness
leads for continuity.
Check the main and fuel pump
relay.
Measure the fuel pressure.
Measure the compression
pressure.
Measure the valve clearance.
Check the camshaft for damage.
Check the cylinder head gasket
and cylinder head warpage.
Check the valve and valve seat for
wear.
Check the piston and piston ring for
damage.
Check the cylinder for damage.
Check the timing chain.
9-18
E
Refer
to page
3-10
1
7-44
4-7
7-42
7-42
2
WD
7-45
3
4-11
3-13
4
3-11
5-56
5-68
5-73
5
5-104
5-105
5-107
5-58
6
7
8
9