Shop Manual

Section 04 FUEL SYSTEM
Subsection 03 (FUEL TANK AND FUEL PUMP)
smr2009-030-024_a
1. Throttle body
2. Inlet hose
3. Connector
Remove D.E.S.S. key from its post to prevent en-
gine starting.
Press START button.
The fuel pump should run for 2 seconds to build
up fuel system pressure.
If fuel pump runs, carry out the
FUEL PUMP
PRESSURE TEST
in this subsection.
If the fuel pump does not run:
– Ensure ECM is powered. Refer to
ELEC-
TRONIC FUEL INJECTION
subsection.
– Check fuse F6. If fuse is faulty, replace it and
repeat test. If fuse is good, carry out the
FUEL
PUMP INPUT VOLTAGE TEST
in this subsec-
tion.
Reconnect throttle body connector.
Fuel Pump Input Voltage Test
Disconnect fuel pump harness connector. Refer
to
FUEL PUMP REMOVAL .
Use the
FLUKE 115 MULTIMETER (P/N 529 035 868).
Select Vdc.
Press START button.
Read voltage at fuel pump harness connector as
per following table.
INPUT VOLTAGE TEST
TEST PROBES VOLTAGE
Pin B
(+ probe)
Battery
ground
(- probe)
Battery voltage
smr2008-022-017_b
If battery voltage is read, power circuit is good.
Test the fuel pump circuit. Refer to
FUEL PUMP
CIRCUIT TEST
.
If battery voltage is not read, power circuit is
faulty. Test continuity of power circuit between
fuse box #1 and fuel pump.
Fuel Pump Circuit Test
Reconnect the fuel pump harness connector.
Remove cover of fuse box #1. Refer to
POWER
DISTRIBUTION
subsection.
Remove the long bus bar.
smr2009-027-011_f
1. Long bus bar
Remove ECM connector B and install it on the
ECM ADAPTER TOOL (P/N 529 036 166).
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