AUDI A4 1996 B5 / 1.G AFC Engine Closed Throttle Position Switch Checking And Adjusting Workshop Manual

24-73


Closed Throttle Position (CTP)
switch, checking and
adjusting

Notes:

To functionally check the Closed Throttle
Position (CTP) switch Repair Group 01, Read
measuring value block, display group 002,
display field 4.

The Closed Throttle Position (CTP) switch is
located in the Throttle Position (TP) sensor
assembly.
Component locations page 24
-1 .

If, while checking or adjusting the Closed
Throttle Position (CTP) switch, the noise
deadener is removed; make sure during re-
assembly that there is a tight fit to the throttle
body to avoid the possibility of an intake air
leak.
For safety, make sure that the Mass Air Flow
(MAF) sensor output voltage is correct page 01
-150
, "Basic Setting" function 04, display
group 002, display field 2.
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Requirements

Accelerator pedal cable adjustment OK:

Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20

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24-74

Electrical check

- Remove intake air sound absorber.

- Disconnect harness connector at throttle
body.

If the specified value is not obtained by opening the throttle slightly, or if
the specified value is obtained only by moving the throttle:
If, after adjusting the CTP switch, it is still not possible to obtain the
specified function: -
Switch multimeter (Fluke 83 or equivalent) to measure resistance ( )
and connect between terminals 4 and 6 using jumper wires from
connector test kit VW 1594. Specified value: 0 ohms (continuity)
- Open throttle slightly.

Specified value: (no continuity)- Adjust CTP switch page 24
-75
.
- Replace throttle position sensor assembly.
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24-75

Adjusting

- Remove throttle body.

- Loosen two throttle position sensor mounting
screws.

Repair Manual, 2.8 Liter V6 2V Engine Mechanical, Engine Code(s):
AFC, Repair Group 20

Checking wiring between CTP switch and ECM - Turn throttle position sensor in direction shown (arrows), without
moving throttle valve shaft, until stop can be felt.
- Tighten throttle position sensor in this position.
- Check CTP switch again page 24
-74
.
- Re-install throttle body and adjust accelerator pedal cable

Terminal assignments for throttle position sensor connector.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check wiring for continuity or short to B+ between throttle position
sensor connector terminal 4 (GND) and test box socket D12.

Specified value: max. 1 ohm ( )
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24-76

- Check wiring for continuity or short to Ground
(GND) between throttle position sensor
connector terminal 6 (signal) and test box socket
A4.


Specified value: max. 1 If the specified value is not obtained:

Note:
If it becomes necessary to repair or replace any of the throttle position
sensor electrical terminals, ONLY replace with gold-plated terminals. - Determine open or short circuit in wiring using wiring diagram; repair as
necessary. 6-pin TP sensor connector terminal
ECM connector A terminal
6 A4
4 Intake manifold Ground (GND)
Pa
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pair&id=AUDI.B5.FU01.24.21