Can-Am DS 450 2008, Shop Manual

Page: 238 / 401

Section 05 FUEL SYSTEM
Subsection 02 (FUEL TANK/FUEL PUMP)
FUEL PUMP INPUT VOLTAGE TEST
TEST PROBES VOLTAGE READING
Pin 3 Pin 4
Pin 3 Chassis ground
Battery voltage
OBSERVATION SIGNIFICATION
Battery voltage is
read for approx
5 seconds, then
it will drop to
approx. 6 Vdc for
1 second, then to
0 Vdc
– Validates fuel pump relay
supplies power to fuel pump.
– Validates the fuel pump relay
ground circuit through ECM.
– Validates fuel pump ground
circuit.
– When voltage drops to
approx 6 Vdc, it validates
the ECM functions to switch
fuel pump ON and OFF.
OBSERVATION POSSIBLE CAUSE
Battery voltage is
not read
– Fuel pump power supply
circuit from fuel pump relay is
defective.
– Fuel pump ground circuit to
ECM is defective.
– ECM is faulty.
If battery voltage was read for both fuel pump in-
put voltage tests, carry out a fuel pump winding
continuity test.
If battery voltage is not read between pins 3 and 4
of the fuel pump connector but is good to chassis
ground, test for continuity of the fuel pump ground
circuit wire (fuel pump connector pin 4 to chassis
ground). Repair or replace wiring as required.
If battery voltage is not read to chassis ground,
carry out the following:
– Fuel pump relay test
– Fuel pump relay input voltage test
– Fuel pump circuit continuity test.
Fuel Pump Winding Continuity Test
Set multimeter to .
Measure the fuel pump motor winding as per fol-
lowing table.
FUEL PUMP WINDING CONTINUITY TEST
FUEL PUMP CONNECTOR
RESISTANCE
@ 20°C (68°F)
Pin 3 Pin 4 Approximately 1
If fuel pump motor winding resistance is not as
per table, replace the fuel pump.
Fuel Pump Relay Quick Test
Locate the fuel pump relay.
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1. Cooling fan relay
2. Main relay
3. Fuel pump relay
Remove the fuel pump relay and set it aside.
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FUEL PUMP RELAY REMOVED
Remove the cooling fan relay of the same type and
plug it into the fuel pump relay socket.
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