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Section 2: Troubleshooting DTCs
Circuit Description
The fuel pump is controlled by the ECM via the
ground circuit of the fuel pump plug. if resis-
tance is unacceptable in that circuit the fuel
pump DTC is set.
•
DTC 230 shows that the signal voltage is
low, which indicates voltage is lost to the
pump, high circuit resistance, or open con-
nection.
•
DTC 232 indicates that higher than ex-
pected voltage is seen on the circuit, which
means that the fuel pump is not providing
enough resistance or is turning too slowly.
When the ignition switch is turned ON, the
ECM activates the electric fuel pump module.
The fuel pump module remains ON as long as
the ECM receives reference pulses from the
CKP sensor. If there are no reference pulses,
the ECM turns the fuel pump relay OFF af-
ter about 2 seconds. This shuts off the fuel
pumps. The fuel pump module delivers fuel to
the fuel rail and fuel injectors.
2
From
RED
Main Power
Relay
DTC P0230/P0232 Fuel Pump Fault
Signal Voltage Low, Open or High
M
Fuel
Pump Module
1
BLUE/YELLOW
J2 09
Fuel Pump
Control
The following conditions may have caused the
fuel pump fuse to malfunction:
1. Faulty fuse.
2. Intermittent short in the fuel pump power
feed circuit.
3. Fuel pump has an intermittent internal
problem.
4. Poor ECM connection.
5. Inspect wire harness connectors for backed
out terminals, improper mating, broken
locks, improperly formed or damaged termi-
nals, and poor terminal to wire connection.
6. Inspect wire harness and relay for damage.
7. Check fuse block for an open fuse.
Always clear DTCs after performing repairs.
ECM
Diagnostic Aids
49
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