MTU MS150112/01E - Page 91

640 – SD Smart NOx Oxidation Factor O2
ZKP-Number: 1.0700.145
Signal error, Smart NOx Sensor (Oxidation Factor O2)
Yellow alarm – warning
Cause Corrective action
Smart NOx sensor (oxidation
factor O2) faulty.
Short circuit or wire break.
1. Check sensor and wiring, replace as necessary (→ Page 189).
2. Contact Service.
643 – SD P-Fuel b.o.F.
ZKP-Number: 1.0164.900
Fuel pressure sensor before optional filter signal error
Yellow alarm – warning
Cause Corrective action
Fuel pressure sensor before
optional filter faulty.
Short circuit or wire break.
1. Check sensor and wiring (B34.3), replace as necessary
(→ Page 189).
2. Fault is rectified when engine is restarted (→ Page 29).
3. Contact Service.
644 – AL L1 P-Fuel b.o.F.
ZKP-Number: 2.0164.921
Fuel supply pressure before optional filter too low (limit value 1)
Yellow alarm – warning
Cause Corrective action
Leaking or obstructed fuel lines
or fuel tank empty.
u Check filter, fuel low-pressure side
645 – AL L2 P-Fuel b.o.F.
ZKP-Number: 2.0164.922
Fuel supply pressure before optional filter too low (limit value 2)
Red alarm – engine shutdown
Cause Corrective action
Leaking or obstructed fuel lines
or fuel tank empty.
u Check filter, fuel low-pressure side
MS150112/01E 2014-10 | Troubleshooting | 91
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