Testing throttle valve potentiometer — AUDI

AJG ALF
Throttle valve potentiometer-G69 informs the engine control unit of the position of the throttle valve.

Test conditions

Testing accelerator cable setting

=> Engine Mechanics; Repair Group 20
Engine Mechanics

Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the ignition must be switched on.
(Connecting fault reader and selecting engine electronics control unit => Page
01-3
.)

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

Basic setting
Q
Enter display group number
XXX
Indicated on display:

Press keys 0, 6 and 0 to select Display Group 60 and confirm entry with Q key.

Basic setting 60
⇒
1
2
3
4
Indicated on display:

Check display value for throttle valve potentiometer (display zone1).

Display zones
1 · 2 · 3 · 4
Display Group 60: Adaption of throttle valve control part with ignition switched on
Display · xx <° · xx <° · --- · ADP. OK
Indicates · Throttle valve angle (potentiometer) · Angle sender for throttle valve drive / (potentiometer) · Operating status · Adaption status
Range · min.: 1 <° / max.: 90 <° · min.: 1 <° / max.: 20 <° · Idling/ part throttle/ full throttle/ overrun cut-off/ acceleration enrichment · ADP. runs / ADP. OK / ADP. ERROR
Specification · 1....20 <° · 1....20 <° · Idling · ADP. OK
Note · Test requirement when testing throttle valve angle (display zone 1)

Observe display zone 1.
Slowly depress accelerator to full throttle position.

If the readout does not change or only changes irregularly:

Test the wiring connections
=> Page
24-111
.

If either the initial or the final specification is not attained:

Test voltage supply.

Testing voltage supply to throttle valve control part

Unplug connector from throttle valve control part.
Connect hand-held multimeter V.A.G 1526 (voltage measurement range) between earth and contact 4 on the connector.
Switch ignition on.

Specification: approx. 5 V

Testing wiring connections

Switch off ignition.
Connect test box V.A.G 1598/22 to wiring harness for engine control unit =>Page
24-21
.

Test the following wiring connections for open circuits and/or shorts to positive or earth

8-pin connector on wiring harness, contact · Test box V.A.G 1598/22, socket
4 · 62
5 · 75
7 · 67

Resistance in wiring: max. 1.5 ω

Rectify any open/short circuit as necessary.

If no wiring fault is detected:

Renew throttle valve control part.