134F04 - P1023 (DME)

134F04 - P1023

Information saved in
DME

Fault code
134F04 - P1023

Fault text
Valvetronic, adjustment range: error, range check

Fault description
The diagnostic function monitors whether the adjustment
range has varied from the base learning data during the
course of the vehicle's service life.

Condition for fault identification
Test condition:
The fault is recognized when the adjustment range deviates
from the base adjustment range by more than 2�.
Potential problem source(s):
- Wear at the travel stops
- Wear in the Valvetronic mechanism
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- Engine warmed to normal temp, above 80 °C
Time condition:
- Adjustment range check every 1800 min. of operating time
Other conditions:
- Shutdown phase

Condition for fault memory entry
none

Action in service
- Repeat Valvetronic travel stop learning routine, refer to
service functions
- Inspect Valvetronic for mechanical wear and resistance to
motion
- Replace components with mechanical wear

Fault effect and breakdown warning
Breakdown notice:
The engine runs in throttled mode, full drivability/power
Possible apparent symptoms:
VVT reverts to limp-home mode, minor effects can be felt

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