Volkswagen Passat 1995 Official Factory Repair Manual page 1644

Output Diagnostic Test Mode (DTM), initiating
Output Diagnostic Test Mode
Heated Oxygen sensor relay-J278
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- Reconnect EVAP canister purge regulator
harness connector
- Perform electrical check
step Fig. 17 .
- Replace Motronic Engine Control Module (J220)
if necessary.
- Activate Heated Oxygen sensor relay (J278) as
follows:
- Press
button.
Display will appear as shown:
The Heated Oxygen sensor relay (on the aux.
fuse/ relay panel) must click until the next DTM
component is activated by pressing the
button.
If the relay does not click:
- Switch off ignition.
- Perform electrical check
step Fig. 5 or locate short circuit using wiring
diagram and correct as necessary.
If an open circuit cannot be located:
- Replace Heated Oxygen sensor relay (J278) or
Motronic Engine Control Module (J220) as
necessary.
- Activate Exhaust Gas Recirculation (EGR) valve
(N18) as follows:
- Press
button.
Page 6 of 9
01-37
Page 01-46 , test
Page 01-44 , test
6/12/2004