Yamaha WaveRunner FZR-GX1800 Service Manual page 385

TRBL
SHTG
Engine unit troubleshooting
Diagnos-
Item
tic code
Intake temp
(*1)
23 sensor
malfunction
Cam position
24 sensor
malfunction
Intake press
(*2)
29 sensor
malfunction
Slant detection
47 switch
malfunction
(*1)
: Intake air temperature sensor
(*2)
: Intake air pressure sensor
(*3)
: This symptom may only be exhibited in certain environmental conditions.
WD: Refer to the wiring diagram.
Symptom
1. Check the intake air temperature using
the YDIS.
2. Measure the intake air temperature
sensor input voltage.
Trolling speed
3. Check the black/red (B/R) and black/
(*3)
is unstable
orange (B/O) intake air temperature
sensor wiring harness leads for conti-
nuity.
4. Measure the intake air temperature
sensor resistance.
1. Measure the cam position sensor input
voltage.
2. Check the orange (O), green/orange
(G/O), and black/orange (B/O) cam
Engine speed
is limited position sensor wiring harness leads
for continuity.
3. Measure the cam position sensor out-
put voltage.
1. Check the intake air pressure using
the YDIS.
2. Measure the intake air pressure sen-
sor input voltage.
Engine stalls
3. Check the orange (O), pink/green (P/
Trolling speed
G), and black/orange (B/O) intake air
(*3)
is unstable
pressure sensor wiring harness leads
for continuity.
4. Check the intake air pressure sensor
operation.
1. Check the slant detection switch oper-
ation using the YDIS.
2. Measure the slant detection switch
input voltage.
Normal
3. Check the blue/black (L/B) and black/
operation
orange (B/O) slant detection switch
wiring harness leads for continuity.
4. Check the slant detection switch conti-
nuity.
9-10
Checking steps
E
Refer
to
page
7-23
1
7-23
WD
2
7-23
7-34
3
WD
4
7-34
9-1
7-25
5
WD
6
7-25
9-1
7-35
7
WD
7-35
8
9