SELVA MARINE Blue Whale 250 EFI Service Manual page 353

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