MTU 12V2000Gx6 series Operating Instructions Manual page 102

439 – HI P-Fuel 2 (Common Rail)
Yellow alarm; warning
Cause
Rail pressure above specified
value.
Suction restrictor of HP fuel block
jamming or HP fuel control block
wiring faulty.
441 – AL Rail 2 Leakage
Yellow alarm; warning
Cause
Pressure gradient in rail is too low
during starting or too high during
stopping.
444 – SD U-PDU
Yellow alarm; warning
Cause
Sensor defect of injector power
stage.
445 – SD P-Ambient Air
Yellow alarm; warning
Cause
Ambient air pressure sensor
faulty.
446 – SD P-HD2
Yellow alarm; warning
Cause
Rail pressure sensor faulty, high-
pressure regulator emergency
mode.
450 – SD Idle/End-Torque Input [%]
Yellow alarm; warning
Cause
Input signal for initial/final torque
faulty.
102 | Troubleshooting | MS15054/03E 2018-07
Corrective action
1. Check wiring of HP fuel control block.
2. Contact Service if no fault can be detected.
Corrective action
1. On engine stopping: Seal off system, contact Service.
2. On engine starting: Check engine for leakage, if none found,
attempt restarting as per operating instructions (air in system).
Corrective action
u Replace Engine Control Unit.
Corrective action
u Replace Engine Control Unit (sensor is in the ECU).
Corrective action
u Check sensor B48.2 and wiring, replace as necessary
(→ Page 221).
Corrective action
1. Check signal transmitter and wiring, replace as necessary.
2. Restart engine (→ Page 67).