Yamaha WaveRunner FX SHO Service Manual page 421

TRBL
ANLS
Engine unit trouble analysis
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 and black/orange
(*3)
is unstable
(B/R and 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, green/orange, and
black/orange (O, G/O, and 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, pink/green, and
Trolling speed
black/orange (O, P/G, and B/O) intake
(*3)
is unstable
air 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 and black/
operation
orange (L/B and B/O) slant detection
switch wiring harness leads for conti-
nuity.
4. Check the slant detection switch conti-
nuity.
9-10
Checking steps
E
Refer
to
page
7-24
1
7-24
WD
2
7-24
7-36
3
WD
4
7-36
9-1
7-26
5
WD
6
7-26
9-1
7-37
7
WD
8
7-37
9