MTU 12 V 4000 M23F Operating Instructions Manual page 105

66 – SS P-Fuel
Fuel supply pressure too low (limit value 2)
Red alarm; engine shutdown
Cause
Leaking or clogged fuel lines or
fuel filter.
67 – HI T-Coolant
Coolant temperature too high (limit value 1)
Yellow alarm; warning
Cause
Coolant circuit not functioning
correctly (e.g. damage, leaks,
low coolant level).
68 – SS T-Coolant
Coolant temperature too high (limit value 2)
Red alarm; engine shutdown
Cause
Coolant circuit not functioning
correctly (e.g. damage, leaks,
low coolant level).
81 – AL Rail Leakage
Leak
Yellow alarm; warning
Cause
During start: Insufficient
pressure gradient in rail (HP
system leaking, air in system).
During stop: Pressure gradient
in rail too high.
ZKP-Number: 2.0102.922
Corrective action
1. Check fuel lines for leakage.
2. Check filter, fuel low-pressure side.
3. Replace fuel filter (→ Page 187).
4. Contact Service.
ZKP-Number: 2.0120.931
Corrective action
1. Reduce power.
2. Check coolant circuit.
ZKP-Number: 2.0120.932
Corrective action
u Check coolant circuit.
ZKP-Number: 1.8004.046
Corrective action
1. Check engine for leaks.
2. Contact Service.
1. Seal engine system.
2. Contact Service.
MS150068/01E 2014-01 | Troubleshooting | 105