754 – SD Bosch LSU Lambda Sensor
ZKP-Number: 1.0800.990
Signal fault, Lambda sensor
Yellow alarm - warning
Cause
Corrective action
Bosch Lambda sensor faulty.
Short circuit or wire break.
1. Check sensors and wiring, replace as necessary (→ Page 181).
2. Contact Service.
757 – AL Lim T-Coolant LT Fan
ZKP-Number: 2.2800.900
Temperature difference between LT coolant temperature and intake air temperature exceeds limit value
Yellow alarm - warning
Cause
Corrective action
Sensor faulty.
Short circuit or wire break.
Radiator blocked.
Fan faulty.
Coolant flow rate too low.
1. Check sensors and wiring (→ Page 181).
2. Check radiator.
3. Check fan.
4. Cooler – Check
5. Check coolant pump.
6. Contact Service.
763 – AL OL EASF Limit Switch B
ZKP-Number: 1.2510.121
Wiring error in monitoring line of emergency-air shutoff flap B
Cause
Corrective action
Short circuit or wire break.
1. Check wiring (→ Page 181).
2. Contact Service.
764 – AL EASF B to A Open
ZKP-Number: 1.2510.125
Emergency-air shutoff flap B closed, but emergency-air shutoff flap A remained open
Cause
Corrective action
Flap A stuck.
Flap A was not energized.
Short circuit or wire break.
1. Check flap A (→ Page 140).
2. Check wiring (→ Page 181).
3. Contact Service.
765 – AL OL EASF Limit Switch A
ZKP-Number: 1.2510.123
Wiring error in monitoring line of emergency-air shutoff flap A
Cause
Corrective action
Short circuit or wire break.
1. Check wiring (→ Page 181).
2. Contact Service.
104 | Troubleshooting | MS150096/01E 2012-08
TIM-ID: 0000029153 - 006
