Can-Am DS 450 2008 Shop Manual page 238

Section 05 FUEL SYSTEM
Subsection 02 (FUEL TANK/FUEL PUMP)
FUEL PUMP INPUT VOLTAGE TEST
TEST PROBES
Pin 3 Pin 4
Pin 3 Chassis ground
OBSERVATION
Battery voltage is
– Validates fuel pump relay
read for approx
supplies power to fuel pump.
5 seconds, then
– Validates the fuel pump relay
it will drop to
ground circuit through ECM.
approx. 6 Vdc for
– Validates fuel pump ground
1 second, then to
circuit.
0 Vdc
– When voltage drops to
approx 6 Vdc, it validates
the ECM functions to switch
fuel pump ON and OFF.
OBSERVATION
Battery voltage is
– Fuel pump power supply
not read
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
Pin 3 Pin 4
218
VOLTAGE READING
Battery voltage
SIGNIFICATION
POSSIBLE CAUSE
RESISTANCE
@ 20°C (68°F)
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.
vmr2008-019-008_A
1. Cooling fan relay
2. Main relay
3. Fuel pump relay
Remove the fuel pump relay and set it aside.
vmr2008-023-013_a
FUEL PUMP RELAY REMOVED
Remove the cooling fan relay of the same type and
plug it into the fuel pump relay socket.
vmr2008-023