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DTC 157-03-High pressure pump fuel delivery quantity in over run
exceeds a maximum threshold
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the high pressure fuel system for leakage during overrun. If the ECU
A-9000 detects that the high pressure pump quantity in overrun exceeds the expected threshold, this fault will occur.
Cause:
The ECU A-9000 has determined that the high pressure fuel pump quantity is higher than the expected fuel quantity
threshold.
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] / 53
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