Vauxhall Workshop Service and Repair Manuals

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

15

TPS SIGNAL

AF 14/20 automatic transmission with 16 SV, 18 SV engine (EI Plus control unit) or with C 20 NE, 20 NE engine (Motronic ML 4.1; Model Year '89)

Ignition ON

Engine OFF

Apply parking brake

Engine throttle valve CLOSED (accelerator pedal in idle position)

Engine throttle valve OPEN (accelerator pedal fully depressed)

Note:

The throttle valve potentiometer is connected directly to the transmission control unit, i.e. the transmission control unit receives information about the throttle valve position directly from the potentiometer.

all other configurations

Ignition ON

greater than 0.5 V

less than 4.6 V

21, 22

15, 32, 35

Note:

The throttle valve potentiometer is connected to the corresponding engine control unit. The automatic transmission receives a prepared signal from the engine control unit, proportional to the throttle valve position.

See test step 17 for the configurations in which TECH 1 displays "NOT USED"

NOT USED

Trouble-shooting:

Nominal Value:

Cause of Fault:

(If nominal value is not attained)

AF 14/20 only:

·   Ignition OFF

·   Disconnect wiring harness plug X 26

·   Ignition ON

·   Measure voltage:

from:      wiring harness plug X 26 Ter. A

to:          ground, Ter. 31

greater than 5 V

If voltage is greater than 5.5 V:

·   Short circuit to voltage

from:      wiring harness plug X 26 Ter. A

to:          transmission control unit wiring harness plug Ter. 32

·   Transmission control unit defective.

If voltage is less than 4.5 V:

·   Circuit interruption

from:      wiring harness plug X 26 Ter. A

to:          transmission control unit wiring harness plug Ter. 32

·   Short circuit to ground

from:      wiring harness plug X 26 Ter. A

to:          transmission control unit wiring harness plug Ter. 32

·   Transmission control unit defective.

·   Using TECH 1, select test step no. 15

·   TECH 1 display

0 V

·   Short circuit to voltage

from:      wiring harness plug X 26 Ter. B

to:          transmission control unit wiring harness plug Ter. 15

·   Transmission control unit defective.

·   Bridge terminals in wiring harness plug X 26

from:      plug X 26 Ter. B

to:          plug X 26 Ter. A

·   TECH 1 display

4.98 V

·   Circuit interruption

from:      plug X 47 Ter.D

to:          transmission control unit wiring harness plug Ter. 27

·   Short circuit to ground, Ter. 31

from:      plug X 47 Ter. D

to:          transmission control unit wiring harness plug Ter. 27

·   Transmission control unit defective.

If nominal values are attained

EI+ only

·   Wiring harness to throttle valve potentiometer P 34 defective.

·   Throttle valve potentiometer P 34 defective.

Motronic 4.1 only

·   Wiring harness to throttle valve switch S 107 defective.

·   Throttle valve switch S 107 defective.