Engine Controls System: 138501

138501 - P304B

Information saved in
DME

Fault code
138501 - P304B

Fault text
Radiator shutter, top, lower stop: not detected

Fault description
The diagnostic function monitors whether the radiator vent
slat assembly closes within a specified angle of rotation.

Condition for fault identification
Test condition:
The fault is recognized when the radiator vent slat actuator
is not able to close the radiator slat assembly within a
specified angle.
Potential problem source(s):
- Mechanical defect in radiator vent slat mechanism (for
instance: broken control linkage,...)
Terminal condition: Terminal 15
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- None
Other conditions:
- none

Condition for fault memory entry
The diagnostic fault code is logged when the fault remains
present for longer than 1 min.

Action in service
- Check radiator vent slat assembly for freedom of
movement (perform system test), repair mechanical
components as required
- Replace radiator vent slat assembly

Fault effect and breakdown warning
Breakdown notice:
Radiator vent slats can be opened by hand
Possible apparent symptoms:
- The engine may overheat.

Driver information
Warning light:
- ECE emissions warning lamp: off
- ECE electronic engine power reduction: off
- CC message: none
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
None