Sea-doo GTI 5558 Shop Manual Download

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Section 06

ENGINE MANAGEMENT (DI)

Subsection 03

(COMPONENT INSPECTION AND ADJUSTMENT)

SMR2002-030 _06_03A.FM

06-03-35

NOTE:

This will write the new value immediately

to the MPEM. There is no need to write the doc-
ument to the MPEM for the TDC setting unless
other changes were made. However, we recom-
mend to reset the service hours when you per-
form a service action such as the TDC setting.

NOTE:

The MPEM features a permanent (non-

volatile) memory and keeps the TDC setting pro-
grammed even when the watercraft battery is dis-
connected.

Engine Start/Stop Switch Verification

A quick operation test can be done using the vehi-
cle communication kit (VCK) with the B.U.D.S. soft-
ware, using the

Monitoring

section. Press the start

button and look at the Start button LED. It should
turn on, indicating the starting system is working
on the input side (start button, MPEM and wiring).
You know now the problem is on the output side
(MPEM output signal to starting solenoid, wiring
harness going to the solenoid, starter motor. Refer
to STARTING SYSTEM for testing procedures).
Otherwise, check the input side as follows.

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. Other-
wise, replace switch.

If the switch tests good, check continuity of cir-
cuits 2-8 and 2-11 using a multimeter.

If wiring harness tests good, it could be the MPEM.
Try a new MPEM referring to MPEM REPLACE-
MENT procedures elsewhere in this section.

Safety Lanyard Switch Verification

If 2 short beeps are not heard when installing the
safety lanyard, refer to DIAGNOSTIC PROCEDURES.

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.

SPARK PLUGS

Disassembly

First unscrew the spark plug one turn.

Clean the spark plug and cylinder head with pres-
surize air then completely unscrew.

Heat Range

The proper heat range of the spark plugs is deter-
mined by the spark plugs ability to dissipate the
heat generated by combustion.

The longer the heat path between the electrode tip
to the plug shell, the hotter the spark plug operat-
ing temperature will be — and conversely, the
shorter the heat path, the colder the operating tem-
perature will be.

A “cold” type plug has a relatively short insulator
nose and transfers heat very rapidly into the cylin-
der head.

Such a plug is used in heavy duty or continuous
high speed operation to avoid overheating.

The “hot” type plug has a longer insulator nose
and transfers heat more slowly away from its firing
end. It runs hotter and burns off combustion de-
posits which might tend to foul the plug during
prolonged idle or low speed operation.

Sea-doo GTI 5558, Shop Manual

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