MTU 8V4000Lx4 Operating Instructions Manual page 128

447 – HIHI P-Charge Mix Diff.
Red alarm. Engine stop.
Associated parameter 2.0183.932
Cause
Difference in mixture pressures
sensed on A- and B-side is too
high (limit value 2).
451 – HI T-Charge Mix
Yellow alarm.
Associated parameter 2.0169.931
Cause
Mixture temperature is too high
(limit value 1). Mixture coolant
pump failure, volumetric flow
too low, cooling system inlet
temperature too high, mixture
cooler clogged.
452 – HIHI T-Charge Mix
Red alarm. Engine stop.
Associated parameter 2.0169.932
Cause
Mixture temperature too high
(limit value 2). Mixture coolant
pump failure, volumetric flow
too low, cooling system inlet
temperature too high, mixture
cooler clogged.
453 – LO T-Charge Mix
Yellow alarm.
Associated parameter 2.0169.921
Cause
Mixture temperature is too low
(limit value 3).
454 – SS Power Reduction Active
Yellow alarm.
Associated parameter 2.7000.011
Cause
Power reduction activated.
128 | Troubleshooting | MS15026/00E 2015-05
Corrective action
1. Check throttles for varying positions and malfunction.
2. Check mixture lines for leakage.
3. Check sensors and cabling (B79.22, B79.21).
Corrective action
1. Check mixture cooling circuit.
2. Check mixture cooler for dirt.
Corrective action
1. Check mixture cooling circuit.
2. Check mixture cooler for dirt.
Corrective action
1. Check intake air temperature.
2. Check mixture cooling circuit.
Corrective action
u Rectify limit value violation of the source alarm (e.g. reduce
intake air temperature).