DTC P0231, P0232, or P023F
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DTC P0231, P0232, or P023F
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DTC P0231
Fuel Pump Control Circuit Low Voltage
DTC P0232
Fuel Pump Control Circuit High Voltage
DTC P023F
Fuel Pump Control Circuit
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Control
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P0231
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P023F
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P0232
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P023F, P2635
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Low Reference
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-
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P023F
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-
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P023F, P2635
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Circuit/System Description
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The engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump control module is active for 2 seconds if the engine is not in one of the modes for Crank (starting) or Run (driving). When this activity voltage is received, the fuel pump's control module supplies a varying voltage to the fuel pump module in the tank in order to maintain the desired fuel line pressure.
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Conditions for Running the DTC
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P0231, P023F
The ignition voltage is between 9-18 V.
P0232
The control enable voltage signal supplied for the ECM to fuel pump control module is inactive for 4 seconds after engine has been shut off.
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Conditions for Setting the DTC
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The fuel pump control module detects a fault on the fuel pump voltage circuit that is less than 11 V or greater than 18 V.
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Action Taken When the DTC Sets
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DTCs P0231, P0232, and P023F are Type A DTCs.
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Conditions for Clearing the DTC
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DTCs P0231, P0232, and P023F are Type A DTCs.
Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set.
The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.
On vehicles with direct injection engines and mechanical high-pressure pump the vehicle can be driven for a time even if the pump in the fuel tank is not working.
Schematic Reference
Engine Controls Schematics (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description (LF1)
Fuel System Description (LAU or LY7)
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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1.
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Ignition OFF, disconnect the harness connector at the A7 fuel pump and level sensor assembly.
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2.
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Connect a test lamp between the control circuit terminal A and ground.
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3.
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Ignition ON, command the ECM fuel pump enable command ON and OFF with a scan tool. The test lamp should turn ON and OFF, when changing between the commanded states.
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4.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump control module.
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5.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
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6.
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Ignition OFF, connect a test lamp between the control circuit terminal A and the low reference circuit terminal B.
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7.
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Ignition ON, command the ECM fuel pump enable command ON with a scan tool. The test lamp should illuminate.
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8.
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If the test lamp does not illuminate, test the low reference circuit terminal B for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
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9.
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If all circuits test normal, replace the A7 fuel pump and level sensor assembly.
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Perform the
Diagnostic Repair Verification
after completing the repair.
