SELVA MARINE Blue Whale 250 EFI, Service Manual

Page: 353 / 377

6P23H11
9-8
1
2
3
4
5
6
7
8
9
24
Cam position
sensor
(PORT EX)
malfunction
D —
1. Check the cam timing using the
YDIS.
9-1
2. Measure the input voltage. 8-28
3. Check the white/blue (W/L) lead
(cam position sensor-to-ECM)
for continuity.
*1
4. Measure the output voltage. 8-28
5. Check the brim of the camshaft. 5-27
28
Neutral switch
malfunction
A —
1. Check the switch operation
using the YDIS.
9-1
2. Check the switch continuity. 8-19
3. Measure the input voltage. 8-19
4. Check the shift bushing and shift
mechanism.
7-1
29
Intake air
pressure
sensor
malfunction
C
Maximum
power
decreases
1. Check the intake air pressure
using the YDIS.
9-1
2. Check the vacuum hoses. 4-2
3. Measure the input voltage. 8-17
4. Check the operation of the
intake air pressure sensor.
8-17
5. Check the pink/green (P/G) lead
(ECM-to-sub wiring harness-to-
intake air pressure sensor) for
continuity.
*1
37
Intake air
passage
malfunction
G
Trolling speed
is unstable
1. Check the O-rings and gaskets
of the intake manifold, surge
tank, and throttle body.
4-12
4-15
2. Check the hose between the
vapor shut-off valve and surge
tank.
4-2
3. Check the throttle valve condi-
tion.
4-5
4. Check the intake air pressure
sensor hose.
4-2
5. Check the pressure regulator
hose.
4-2
*1: See the wiring diagram.
Trouble
code
Item
Symptom
Checking steps
Refer
to
page
Remarks
Troubleshooting the power unit