Sea-doo 2001 RX, Shop Manual

Page: 128 / 351

Section 05 ENGINE MANAGEMENT (DI)
Subsection 03 (COMPONENT INSPECTION AND ADJUSTMENT)
05-03-2
SMR2000-051-05-03A.FM
ELECTRICAL SYSTEM
It is important to check that the electrical system
is functioning properly:
– battery
– fuses
– DESS
– ignition (spark)
– ground connections
– wiring connectors.
It is possible that a component seems to operate
in static condition but in fact, it is defective. In this
case, the best way to solve this problem is to re-
move the original part and replace it with one
which is in good condition.
Never use a battery charger to replace temporarily
the battery, as it may cause the MPEM to work
erratically or not to work at all. Check related-circuit
fuse solidity and condition with an ohmmeter. Vi-
sual inspection could lead to false results.
To perform verifications, a good quality multimeter
such as Fluke 73 (P/N 529 022 000) should be used.
Pay particular attention to ensure that pins are not
out of their connectors or out of shape. The trou-
bleshooting procedures cover problems not re-
sulting from one of these causes.
Before replacing a MPEM, always check electrical
connections. Make sure that they are very tight and
they make good contact and that they are corrosion-
free. A “defective module” could possibly be re-
paired simply by unplugging and replugging the
MPEM. The voltage and current might be too
weak to go through dirty wire pins. Check carefully
if posts show signs of moisture, corrosion or if
they look dull. Clean pins properly and then coat
them with silicon-based dielectric grease or other
appropriate lubricant (except if otherwise speci-
fied) when reassembling them. If the newly re-
placed MPEM is working, try the old one and re-
check if it works.
Ensure that all electronic components are genu-
ine — particularly in the ignition system. Installing
resistive caps, non-resistive spark plug cables (or
modified length) or non-resistive spark plugs may
lead to generate fault codes or bad operation.
NOTE: Diagnostics Communication Kit. See DI-
AGNOSTICS section.
After a problem has been solved, ensure to clear
the fault(s) in the MPEM using the VCK. Refer to
DIAGNOSTIC PROCEDURES.
Resistance Measurement
When measuring the resistance with an ohmmeter,
all values are given for a temperature of 20°C
(69°F). The resistance value of a resistance varies
with the temperature. The resistance value for
usual resistor or windings (such as injectors)
in-
creases as the temperature increases. However,
our temperature sensors are NTC types (Negative
Temperature Coefficient) and work the opposite
which means that the resistance value
decreases
as the temperature increases. Take it into account
when measuring at temperatures different from
20°C (69°F). Use this table for resistance variation
relative to temperature for
temperature sensors.
CONVERSION CHART FOR TEMPERATURE SENSORS

WARNING
All electrical actuators (injectors, fuel pump,
RAVE solenoid, ignition coil and starter sole-
noid) are permanently connected to the bat-
tery positive terminal, even when the safety
lanyard is removed. Always disconnect the
battery prior to disconnecting any electric or
electronic parts.

WARNING
Ensure all terminals are properly crimped on
wires and connector housings are properly
fastened.
TEMPERATURE RESISTANCE
°C °F OHMS LOW HIGH
- 10 14 9500 8000 11,000
0 32 5900 4900 6900
10 50 3800 3100 4500
20 68 2500 2200 2800
30 86 1700 1500 1900
40 104 1200 1080 1320
50 122 840 750 930
www.SeaDooManuals.net