Checking terminal 30 voltage supply relay J317 ( diesel direct injection system control unit J248 ) — AUDI

Checking
terminal 30 voltage supply relay
J317
(
diesel direct injection system control unit
J248
)
The
terminal 30 voltage supply relay
J317
is responsible for the injection system power supply.
The relay only closes when voltage is applied via terminal 15 to the diesel direct injection system control unit, i.e. the relay is only connected to earth (via engine control unit 1) when engine control unit 1 is supplied with voltage via terminal 15.
Note
The
terminal 30 voltage supply relay
J317
is located in the micro-central electrics in the electronics box in the passenger's footwell (relay position 4).
Checking engine control unit 1 power supply via terminal 15
Connect test box
V.A.G 1598/30
to wiring harness to
diesel direct injection system control unit
J248
Chapter
.
Connect portable multimeter (voltage measuring range) to socket 4/26 of test box and earth.
Switch on ignition.
Specification: approx. battery voltage
If reading does not match specification:
Check wiring.
Current flow diagrams, Electrical fault finding and Fitting locations
Connect portable multimeter (voltage measuring range) to socket 1/07 of test box and earth.
Switch on ignition.
Specification: approx. battery voltage
If reading does not match specification:
Check wiring.
Current flow diagrams, Electrical fault finding and Fitting locations
Checking switched earth connection of
terminal 30 voltage supply relay
J317
Both engine control units connected
Battery voltage OK
Terminal 15 voltage supply OK
Relay inserted in relay socket
Switch on ignition.
Specification:
Terminal 30 voltage supply relay
J317
must be energised
Note
The
terminal 30 voltage supply relay
J317
is located in the micro-central electrics in the electronics box in the passenger's footwell (relay position 4).
Clicking of the relay is not readily audible and can thus best be determined by way of touch.
If reading does not match specification:
Switch off ignition.
Connect test box
V.A.G 1598/30
to wiring harness to
diesel direct injection system control unit
J248
.
Inter-connect sockets 1/06 and 1/09 of test box with a test lead from
V.A.G 1594/1;Messleitungen
.
Switch on ignition.
Specification:
Terminal 30 voltage supply relay
J317
must be energised
Note
The
terminal 30 voltage supply relay
J317
is located in the micro-central electrics in the electronics box in the passenger's footwell (relay position 4).
Clicking of the relay is not readily audible and can thus best be determined by way of touch.
If relay is now energised, but not with control unit connected:
Replace
diesel direct injection system control unit
J248
Chapter
.
If relay is not energised:
Switch off ignition.
Remove terminal 30 voltage supply relay from relay socket (micro-central electrics in electronics box in passenger's footwell, relay position 4).
Check for open circuit and short to earth or positive in the following wiring:
Micro-central electrics
on right in passenger's footwell, position 4
Contact
Test box
V.A.G 1598/30
Socket
16
1/09
Resistance: max. 1.5 ohms
Eliminate open circuit in wiring or short circuit if necessary.
Current flow diagrams, Electrical fault finding and Fitting locations
Checking terminal 30 power supply
Battery voltage OK
Terminal 15 voltage supply OK
Switched earth connection of
terminal 30 voltage supply relay
J317
OK
Switch off ignition.
Remove
terminal 30 voltage supply relay
J317
from relay socket.
Note
The
terminal 30 voltage supply relay
J317
is located in the micro-central electrics in the electronics box in the passenger's footwell (relay position 4).
Connect portable multimeter (voltage measuring range) to the following relay socket contacts:
Micro-central electrics
on right in passenger's footwell, position 4
Contact
Test box
V.A.G 1598/30
Socket
17 + earth
approx. battery voltage
19 + earth
approx. battery voltage
If reading does not match specification:
Check wiring.
Current flow diagrams, Electrical fault finding and Fitting locations
If reading matches specification, check power supply.
Checking engine control unit 1 power supply via terminal 30
Re-connect terminal 30 voltage supply relay to relay socket (relay position 4).
Connect test box
V.A.G 1598/30
to wiring harness to
diesel direct injection system control unit
J248
Chapter
.
Inter-connect sockets 1/06 and 1/09 of test box with a test lead from
V.A.G 1594/1;Messleitungen
.
Connect portable multimeter (voltage measuring range) to the following contacts of test box
V.A.G 1598/30
.
Test box
V.A.G 1598/30
, socket
Specification
1/01 + 1/04
approx. battery voltage
1/01 + 1/05
approx. battery voltage
1/08 + 1/04
approx. battery voltage
1/08 + 1/05
approx. battery voltage
If readings do not match specifications:
Check wiring.
Current flow diagrams, Electrical fault finding and Fitting locations