CD840A

CD840A - U1185

Information saved in
DME

Fault code
CD840A - U1185

Fault text
DME/DDE PT-CAN: Communication fault

Fault description
The diagnostic function monitors the FA CAN.

Condition for fault identification
Test condition:
The fault is recognized when a short circuit is present.
Potential problem source(s):
- Defect in FA CAN plugs or wiring harness
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
This fault is logged in the control module's fault memory
immediately.

Action in service
- Carry out system analysis.

Fault effect and breakdown warning
Breakdown notice:
None
Possible apparent symptoms:
- No tachometer display in the instrument cluster
- Brief rpm drop when IHKA automatic climate control is
activated at idle

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

Service instruction
None