MTU 12 V 4000 L63 Operating Instructions Manual page 122

447 – HIHI P-Charge Mix Diff.
Red alarm. Engine shutdown.
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 shutdown.
Associated parameter 2.0169.932
Cause
Mixture temperature is 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).
122 | Troubleshooting | MS150058/01E 2012-07
ZKP-Number:
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).
ZKP-Number:
Corrective action
1. Check mixture cooling circuit.
2. Check mixture cooler for dirt.
ZKP-Number:
Corrective action
1. Check mixture cooling circuit.
2. Check mixture cooler for dirt.
ZKP-Number:
Corrective action
1. Check intake air temperature.
2. Check mixture cooling circuit.