Manufacturer Code Charts: 138101

138101 - P0478

Information saved in
DME

Fault code
138101 - P0478

Fault text
Exhaust flap, activation: short circuit to positive

Fault description
The diagnostic function monitors the activation wire to the
exhaust-gas flap.

Condition for fault identification
Test condition:
The fault is recognized by the driver circuit's diagnostic
function.
Potential problem source(s):
- Defect in wire between DME and exhaust flap
- Exhaust-gas flap's valve defective
- Defective DME
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- None
Other conditions:
- Engine on
- Exhaust-gas flap recognized

Condition for fault memory entry
This fault is logged in the control module's fault memory
immediately.

Action in service
- Check wiring harness between DME and exhaust-gas flap
- Replace valve
- Replace DME

Fault effect and breakdown warning
Breakdown notice:
None
Possible apparent symptoms:
Vehicle quieter during driving

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