P0686

1F0502 - P0686

Information saved in
DME

Fault code
1F0502 - P0686

Fault text
Terminal 15N from CAS, signal: not switched

Fault description
E7X: The diagnostic function monitors the DME main relay.
F01: The diagnostic function monitors the voltage supply
from the CAS to the DME.

Condition for fault identification
Test condition:
E7X: The fault is recognized when the DME main relay's
contacts fail to close within a specified period after Terminal
15 is energized.
F01: The fault is recognized when no voltage is present at
the DME within a specific period after Terminal 15 is
energized.
Potential problem source(s):
E7X: - The control-activation wire to the DME main relay
has a short circuit to positive or is open
- Defective DME main relay
F01: - Defect in wiring harness between CAS and DME
Terminal condition: Terminal 15
Voltage condition:
- Electrical system voltage > 10 V
Temperature condition:
- None
Time condition:
- 1 sec. after Terminal 15 on
Other conditions:
- none

Condition for fault memory entry
This fault is logged in the control module's fault memory if
it remains present for longer than 1 sec.

Action in service
E7X: - Check wiring harness between DME main relay and
DME
- Determine whether the DME main relay is switching. If
not, then replace the DME main relay
- If the diagnostic fault code has been logged numerous
times, replace the DME main relay F01: - Check wiring
harness between DME and CAS

Fault effect and breakdown warning
Breakdown notice:
- none
Possible apparent symptoms:
- Engine difficult or impossible to start. If the engine starts,
then it runs badly.

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
- none