Manufacturer Code Charts: 190401

190401 - P1449

Information saved in
DME

Fault code
190401 - P1449

Fault text
DMTL, system fault: pump current too high during
reference measurement

Fault description
The diagnostic function monitors the leakage diagnosis
pump's current draw during the DMTL solenoid valve's
switching process.

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 3.8 °C and 35.3 °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
- If diagnostic fault codes for the DMTL are logged, then
clear the ECU fault memory. Should it prove impossible to
reproduce the fault using the DMTL function test then
terminate the repair session.
- Check wiring harness between DME and DMTL
- Replace DMTL

Fault effect and breakdown warning
Breakdown notice:
To be submitted by end of week 44
Possible apparent symptoms:
MIL on, customer proceeds to service facility.

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.