Manufacturer Code Charts: 190302

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 leakage diagnosis
pump's test current.

Condition for fault identification
Test condition:
The fault is recognized when the leak diagnosis pump's
current fails to reach a specified limit within a time window
defined in the program map.
Potential problem source(s):
- Defective wiring harness
- DMTL defective
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- Ambient temperature between 1.5 °C and 38 °C
Time condition:
- 10 min. in shutdown phase
Other conditions:
1. Cold start (engine temperature max. 6 °C above ambient
temperature)
2. Then drive at least 600 sec.
3. Remain stationary for at least 30 sec. at idle
4. Drive over 45 km/h for at least 300 sec. (total)
5. Fuel level between 15% and 85% of maximum tank
capacity
7. Then switch off engine, Terminal 15 off
8. Wait roughly 10 min. until diagnostic routine is
completed

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 DMTL
- Replace DMTL

Fault effect and breakdown warning
Breakdown notice:
None
Possible apparent symptoms:
None

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
Function 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.