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DTC 455-03-High pressure pump fuel delivery quantity at low idle
is too high
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors fuel rail pressure. If the ECU A-9000 determines that the requested
fuel pressure is greater than the actual fuel pressure at idle, leakage is assumed and this fault will occur. Other active
faults may have caused this fault to occur. Use the Electronic Service Tool (EST) to check for other active faults.
Diagnose any active faults related to the fuel system first and then return to this fault. For more information regarding
fuel system troubleshooting, see Fuel injection system - Troubleshooting (10.218).
Cause:
The ECU A-9000 has determined that the requested fuel pressure is greater than the actual fuel pressure at idle.
Possible failure modes:
1.
Faulty low pressure fuel system, clogged filter or leakage/blockage.
2.
Faulty charge gear pump, low efficiency or line clogged/damaged.
3.
Faulty electric fuel pump (if equipped).
4.
Faulty fuel metering unit, unable to fully open.
5.
Faulty high pressure pump, low efficiency.
6.
Faulty fuel injectors, stuck open or internal leakage.
7.
Faulty Pressure Relief Valve (PRV), leakage.
8.
Faulty rail pressure sensor B-9004 drifted signal or leaking.
9.
Faulty ECU A-9000, software.
Electrical systems - FAULT CODES
47866583_ 02/12/2015
55.12 [55.DTC] / 224
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