Error code ECU 001485.02 is triggered when the ECU detects an internal feedback error from the main ECU relay. This error indicates a malfunction in the feedback circuit or a failure in the relay itself, potentially affecting the overall operation of the engine control unit.

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Error code ECU 001550.06 is triggered when the ECU detects high current in the circuit of the A/C compressor clutch, indicating a short to ground. This condition can lead to overheating and potential damage to the compressor clutch and its electrical components.

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This error code, ECU 001550.05, is set when the ECU detects low current in the circuit of the A/C compressor clutch, indicating an open circuit. This condition can prevent the compressor clutch from engaging, leading to a lack of air conditioning function.

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Error code ECU 001351.06 is triggered when the ECU detects that the circuit current for the compressor clutch used in trailer air brakes is too high, indicating a short to ground. This excessive current can cause overheating and potential damage to the compressor clutch and associated electrical components.

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Error code ECU 001351.05 is triggered when the ECU detects that the circuit current for the compressor clutch for trailer air brakes is too low, indicating an open circuit. This condition can prevent the compressor clutch from engaging, affecting the operation of the trailer air brakes.

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This error code, ECU 001348.06, is set when the ECU detects low resistance in the circuit of fuel pressure control valve 2, indicating a short to ground. This condition can cause the control valve to malfunction, affecting fuel pressure regulation.

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Error code ECU 001348.05 is triggered when the ECU detects that the circuit resistance for fuel pressure control valve 2 is too high, indicating an open circuit. This condition can prevent the valve from operating correctly, affecting fuel pressure regulation.

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Error code ECU 001347.07 is triggered when the ECU detects that the fuel rail pressure deviates by 5 MPa (50 bar; 725 psi) above or below the expected pressure. This deviation indicates a problem with the fuel pressure regulation at control valve 1.

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This error code, ECU 001347.06, is set when the ECU detects low resistance in the circuit of fuel pressure control valve 1, indicating a short to ground. This condition can cause the control valve to malfunction, affecting fuel pressure regulation.

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Error code ECU 001347.05 is triggered when the ECU detects a mismatch between the measured pump current and the commanded pump current. This condition, coupled with high circuit resistance, indicates an open circuit in the fuel pressure control valve 1.

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Error code ECU 001347.03 is triggered when the ECU detects high current in the pump control valve return lead. This condition suggests a potential electrical fault such as a short circuit or malfunctioning control valve.

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