953 – AL Lambda value invalid
ZKP-Number: 1.1600.903
Yellow alarm; warning
Cause
Corrective action
Invalid Lambda value.
1. Check if coolant temperature (HT coolant circuit) is > 60 °C.
2. If fault code number 754 is output at the same time, replace
Lambda sensor.
3. Contact Service.
954 – AL NOx value invalid
ZKP-Number: 1.1600.905
Yellow alarm; warning
Cause
Corrective action
Invalid NOx value.
1. Check if coolant temperature (HT coolant circuit) is > 60 °C.
2. If fault code number 663 is output at the same time, replace
NOx sensor.
3. Check condition of injectors.
4. Check engine in steady-state condition for black exhaust color.
5. Check if fault code 961 is active.
6. Check engine for idle-speed hunting. Verify with DiaSys that the
engine speed signal does not vary.
7. Contact Service.
955 – AL Thermal Management active
ZKP-Number: 1.1600.907
Yellow alarm; warning
Cause
Corrective action
Engine is in NTE (Not-To-Exceed)
range; Thermal management is
active.
u
Contact Service.
956 – AL p5 ctrlvar limit min active
ZKP-Number: 1.1600.909
Yellow alarm; warning
Cause
Corrective action
Internal engine fault.
u
Contact Service.
957 – AL p5 ctrlvar max BOI min active
ZKP-Number: 1.1600.911
Yellow alarm; warning
Cause
Corrective action
Internal engine fault.
u
Contact Service.
80 | Troubleshooting | MS15033/02E 2015-02
TIM-ID: 0000047144 - 003
