Checking glow plug relay -J52 and actuation — AUDI

ABP AEL
Special tools and workshop equipment required

V.A.G 1526 A
V.A.G 1527 B
V.A.G 1594 A
V.A.G 1598 with V.A.G 1598/5
VAS 5051 with VAS 5051/1 and VAS 5051/2

Note:

Glow plug relay -J52 is located at socket 4 in the central electrics underneath the dash panel on the driver's side.

Test requirement:

Battery voltage at least 12.7 V

Checking operation of glow plug relay

Unplug connectors from glow plugs.
Connect up voltage tester V.A.G 1527 B to one glow plug connector and engine earth.
Remove driver's storage compartment.

=> General Body Repairs; Repair Group 70; Dash Panel
General Body Repairs
Dash Panel

Connect up vehicle diagnostic, testing and information system VAS 5051 => Page
01-2
and select vehicle system "01 - Engine electronics" from list. Ignition must be on.
Initiate final control diagnosis and actuate glow plug relay
=> Page
01-44
.
Glow plug relay pick-up must be heard and felt; LED must light

Terminate function "03 - Final control diagnosis" by touching ◂ key.
Touch "06 - End output".
Switch off ignition.

A - If relay does not pick up:

Check power supply of glow plug relay => Page
28-7
.
Check actuation of glow plug relay => Page
28-7
.

B - If relay is energized but LED does not light:

Remove relay (socket 6) from central electrics underneath dash panel on driver's side.
Check wiring from relay socket terminal 30/87 via fuse for glow plugs S39 (in electronics box in footwell on passenger side) to glow plugs.
Check power supply of glow plug relay => Page
28-7
.

Checking power supply of glow plug relay

Connect up multimeter to measure voltage at contact 32/30 of relay socket and earth.
Specification: approx. battery voltage

Connect up multimeter to measure voltage at contact 28/15 of relay socket and earth.
Switch on ignition.
Specification: approx. battery voltage

Switch off ignition.

If readings do not match specifications:

Replace central electrics.

Checking switched earth connection of glow plug relay

Voltage supply to glow plug relay -J51 OK

Reinsert relay.

With ignition switched off, use adapter V.A.G 1598/5 to connect test box V.A.G 1598A to engine control unit connector only (not to control unit) => Page
23-45
.
Use leads from adapter set V.A.G 1594 A to jumper contacts 8 and 18 at test box.

Switch on ignition.
Glow plug relay (in central electrics underneath dash panel in driver's side footwell, socket 6) must pick up

If relay now picks up, but not during final control diagnosis:

Replace engine control unit => Page
23-48
.

If relay does not pick up:

Switch off ignition.
Disconnect cable jumper.
Remove relay (socket 6) from central electrics underneath dash panel on driver's side.
Check for open circuit and short to earth/positive in the following wiring:

Central electrics underneath dash panel on driver's side, socket 6 · Test box V.A.G 1598 A
Contact · Socket
29/S · 8

Use current flow diagram to eliminate open circuit in wiring/short circuit.

If no fault is found:

Replace glow plug relay.
Reconnect engine control unit.