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DTC P0627-P0629Diagnostic Instructions
DTC DescriptorsDTC P0627 00: Fuel Pump Relay Control Circuit OpenDTC P0628 00: Fuel Pump Relay Control Circuit Low Voltage DTC P0629 00: Fuel Pump Relay Control Circuit High Voltage Diagnostic Fault Information
Circuit/System DescriptionThe engine control module (ECM) provides ignition voltage to the coil side of the fuel pump relay whenever the engine is cranking or running. The ECM enables the fuel pump relay as long as the engine is cranking or running, and ignition system reference pulses are received. If no ignition system reference pulses are received, the ECM turns OFF the fuel pump. The fuel pump relay control circuit is equipped with a feedback circuit that is pulled up to voltage within the ECM. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. Conditions for Running the DTCP0627 00 and P0628 00
P0629 00
Conditions for Setting the DTCP0627 00The ECM detects the fuel pump relay control circuit is open for greater than 1 s. P0628 00The ECM detects the fuel pump relay control circuit is shorted to ground for greater than 1 s. P0629 00The ECM detects the fuel pump relay control circuit is shorted to battery for greater than 1 s. Action Taken When the DTC SetsDTC P0627, P0628 and P0629 are Type A DTCs. Conditions for Clearing the DTCDTC P0627, P0628 and P0629 are Type A DTCs. Reference InformationSchematic ReferenceConnector End View ReferenceElectrical Information ReferenceDTC Type ReferencePowertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool ReferenceCircuit/System Verification
Circuit/System Testing
If greater than the specified range, test the ground circuit for an open/high resistance. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. 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 K20 Engine Control Module. Component TestingRelay Test
If not within the specified range, replace the KR23A Fuel Pump Relay.
If not the specified value, replace the KR23A Fuel Pump Relay. If greater than the specified range, replace the KR23A Fuel Pump Relay. Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure. |
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