P0456

190302 - P0456

Information saved in
DME

Fault code
190302 - P0456

Fault text
Fuel tank ventilation system and purge air system, micro-
leak: Leak greater than 0.5 mm

Fault description
The diagnostic function monitors the DMTL module pump's
electrical current draw within a time window.

Condition for fault identification
Test condition:
The fault is recognized when the current fails to reach a
specified reference value within a time window defined in
the program map.
Potential problem source(s):
- Leakage > 0.5 mm in tank EVAP vent system
Terminal condition: none
Voltage condition:
- 10.95 V < electrical system voltage < 16 V
Temperature condition:
- Ambient temperature between 1.5 °C and 38 °C
Time condition:
- None
Other conditions:
- Tank fuel level between 1/4 and 3/4

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

Action in service
- If diagnostic fault codes for the DMTL are logged, then
clear the control module fault memory
- Perform DMTL operational test
- If it is possible to reproduce the fault with the DMTL
operational test then look for a leak in the EVAP vent
system

Fault effect and breakdown warning
Breakdown notice:
- none
Possible apparent symptoms:
- none

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

Service instruction
- Operational testing on the DMTL (Diagnostic Module
Tank Leakage) can only be carried out provided that no
faults related to the DMTL have been logged. The
conditions for fault detection apply to the function test, but
not to diagnosis in the course of normal operation.