Section 08
ELECTRICAL SYSTEM
Subsection 02
(IGNITION SYSTEM)
SMR2000-021_08_02A.FM
08-02-13
Access the
BOSH SYSTEM
in the MPEM pro-
grammer, then select
ADJUSTMENT
in the sub-
menu.
Choose
IGNITION
in the
ADJUSTMENT
menu.
The screen will display the actual ignition timing
correction in degrees and it will also offer to adjust it.
Refer to the following chart to find the number cor-
responding to the timing correction needed.
Ignition timing is set at 12° BTDC at any RPM.
VCK (Vehicle Communication Kit)
For the 787 RFI and 947 engines, use the VCK (Ve-
hicle Communication Kit) (P/N 295 035 676) to ad-
just the ignition timing. Look the proper
Setting
section of the software B.U.D.S.
CAUTION:
If the ignition timing is adjusted too
advanced, this will cause serious damage to
the engine.
Refer to the timing correction charts, used per
MPEM Programmer
, to find the number corre-
sponding to the timing correction needed.
IGNITION SYSTEM TESTING
PROCEDURE
When dealing with ignition problems, the follow-
ing items should be verified in this order:
1. Spark occurrence
/
spark plug condition.
2. Battery condition.
3. Electrical connections.
4. Engine start/stop switch.
5. Safety lanyard switch.
6. Timer.
7. Multi-Purpose Electronic Module (MPEM).
8. Magneto output (717 engine).
9. Ignition coil output.
CAUTION:
Whenever replacing a component
in ignition system, check ignition timing.
NOTE:
To perform verification, a good quality mul-
timeter such as Fluke 73 (P/N 529 022 000) should
be used.
Engine Start/Stop Switch Verification
Disconnect the YELLOW/RED wire of the start/
stop switch. Using an ohmmeter, connect test
probes to YELLOW/RED wire and to ground.
Measure resistance, it must be an open circuit
(switch is normally open). Depress and hold switch,
the ohmmeter should read close to 0 ohm.
Safety Lanyard Switch Verification
If 2 short beeps are not heard when installing the
safety lanyard, refer to DIGITALLY ENCODED SE-
CURITY SYSTEM.
The following continuity tests can also be per-
formed using an ohmmeter:
Disconnect switch wires.
Safety Lanyard Removed
Connect test probes to switch BLACK and BLACK/
YELLOW wires. Measure resistance, there should
be no continuity (open circuit).
Connect one test probe to the WHITE/GRAY wire
and the other test probe to the switch terminal.
Measure resistance, it must be close to 0 ohm.
Connect one test probe to the BLACK wire and the
other test probe to the switch ring. Measure resis-
tance, it must be close to 0 ohm.
Safety Lanyard on Switch
Connect test probes to switch BLACK and BLACK/
YELLOW wires. Measure resistance, it must be
close to 0 ohm.
TIMING CORRECTION CHART 787 RFI
PROGRAMMER
NUMBER
(MPEM)
IGNITION TIMING
CORRECTION
1
4.50°
2
3.75°
3
3°
4
2.25°
5
.75°
6
0°
7
- 0.75°
8
- 2.25°
www.SeaDooManuals.net
Summary of Contents for 2001 GS
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