3.12
ELECTRONIC FUEL INJECTION
Fuel Sender Test
If the fuel gauge reading on the instrument cluster is not
working, or if the display reading differs in large comparison to
the fuel in the tank, perform a resistance test on the fuel sender.
Disconnect the fuel pump / sending unit connection and measure
the resistance between the Purple and Brown wires. If out of
specification, replace the fuel pump / tank assembly.
Fuel Pump Test
NOTE: The fuel pump / tank assembly is a non-
serviceable assembly and must be replaced if
determined to be faulty. If a fuel delivery problem is
suspected, make certain the pump is being activated
by the ECU and EFI relay, all electrical connections
are properly secured, the 20A EFI fuse is good, and a
minimum of 7.0 volts is being supplied.
1. Couple the Fuel Pressure Gauge Adaptor (PS-48762) to
the Fuel Pressure Gauge Kit (PU-43506-A).
2. Locate the fuel pressure valve attached to the fuel rail.
3. Remove the black cap and attach the fuel pressure gauge
kit and adaptor to the pressure valve. Route the clear hose
into a portable gasoline container or the vehicle’s fuel tank.
4. Turn on the key switch to activate the pump and check the
system pressure on the gauge. If system pressure of 43 psi
± 3 is observed, turn the key switch “off” and depress the
valve button on the tester to relieve the system pressure.
NOTE: If the fuel pressure is out of specification,
replace the fuel pump / tank assembly.
5. If the pump did not activate (Step 4), disconnect the plug
from the fuel pump. Connect a DC voltmeter across
terminals “A” and “C” in the plug on the vehicle harness
side. Turn on the key switch and observe voltage to ensure
a minimum of 7 volts is present.
NOTE: If the voltage was below 7 VDC, test battery,
ignition switch, EFI relay and wiring harness.
6. If the reading is between 7 and 14 volts, turn key switch off
and connect an ohmmeter between the terminals “A” and
“C”' in the plug on the pump harness to check for continuity
within the fuel pump.
NOTE: If there was no continuity between the pump
terminals, replace the fuel pump / tank assembly.
7. If voltage at the plug was within the specified range, and
there was continuity across the pump terminals, reconnect
the plug to the pump, making sure you have clean
connections. Turn on the key switch and listen for the pump
to activate.
NOTE: If the pump starts, verify you have the
correct amount of fuel pressure.
8. If the pump still does not operate, check ECU operation by
plugging in a known-good ECU of the same model.
NOTE: If the pump still does not operate, replace the
fuel pump / tank assembly.
Fuel Sender Resistance Specifications:
Full: 6 Ω
Empty: 90 Ω
CAUTION
Fuel is extremely flammable and may cause
severe burns, injury, or death.
Do not use any device that produces a flame or
electrical devices that may spark around
fuel or fuel vapors.
Relief Valve
Adaptor shown is
included with kit.
PU-43506-A
PS-48762
7/16-20 Schrader
Fuel Pump Pressure: 43 psi ± 3
Pressure Valve
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