Electrical Specifications

Component specifications

Wheel sensor 7/31,7/32,7/56,7/57

General





Type
Hall sensor (active sensor).

characteristic
When the toothed wheel rotates, a pulsed current signal (square wave) with fixed pulse ratio is generated. The frequency increases with speed.

Tooth at sensor
- I approximately 14 mA

Cover at sensor
- I approximately 7 mA

Other information
Nothing

Terminal

Front wheel sensor





Rear wheel sensor










Check
Prerequisites (unless otherwise specified):

Note! On special vehicles like police and taxi, all extra connected devices must be shut off as they may use any of the signal outputs in the table above.

- Breakout box connected.
- Sensor engaged.
- Ignition switch position II.
Create a temporary voltage feed between #1 on the breakout box via a resistor of 1kohms and the sensor's signal output (#7, #9, #11, or 14). Connect a voltmeter between the sensor's signal output and ground connection #16. Turn the wheel slowly:
Tooth against sensor U approximately ULow
Gap against sensor U approximately Ubat





Pedal position sensor 7/124

General





Type
Slide potentiometer.
The sensor is actuated by the brake pedal pushrod

characteristic
Resistance between terminals #2 and #3 should be approx. 0.5 kohms when the brake pedal is not actuated. Resistance should increase when the brake pedal is depressed.
Resistance between terminals #3 and #1 should be approx. 2.5 kohms when the brake pedal is not actuated. Resistance should decrease when the brake pedal is depressed.
Upon ignition, voltage should be:
0 mm approximately 0.15 V (brake pedal not actuated)
38.5 mm approximately 4.75 V (brake pedal depressed)

Other information
None.

Terminal










Check
Prerequisites (unless otherwise specified)
- Breakout box connected
- Sensor connected
- Ignition switch position II

Check 1
Voltage between terminals #A3 and #A21 should be approximately0.15 V when the brake pedal is not actuated and up to approximately4.85 V when the brake pedal is depressed.

Vacuum sensor 7/160

General





Type
Vacuum pressure sensor: Double piezoresistive sensors
The sensor measures the pressure change between the vacuum chamber and the work chamber. The signal ratio between the chambers should correspond.

characteristic
Vacuum chamber (1): Voltage between terminals #30 (#A30) and #40 (#A40) should be similar to diagram 1 below.
Work chamber (2): Voltage between terminals 41 (A#41) and #40 (#A40) should be similar to diagram 2 below.






Pedal pressure sensor/check valve (same connector)

Type
Pedal pressure sensor: Two-pin, Quickshifter located within the brake servo on the brake servo pushrod
Check valve: Electric coil with magnet core and valve

Characteristic pedal pressure sensor
Resistance between terminals #1 and #5 should be infinite when the brake pedal is not actuated and 0 ohms when the brake pedal is depressed
Resistance between terminals #2 and #5 should be 0 ohms when the brake pedal is not actuated and infinite when the brake pedal is depressed

Characteristic, check valve
Resistance between terminals #3 and #4 should be approx. 3 ohms.

Check, pedal pressure sensor
Prerequisites (unless otherwise specified):

Check
- Breakout box connected
- Sensor connected
- Ignition switch position II

Check 1, pedal pressure sensor
Voltage between terminals #21 (#A21) and #23 (#A23) should be 0 V when the brake pedal is not actuated and 12 V when the brake pedal is depressed.
Voltage between terminals #21 (#A21) and #24 (#A24) should be 12 V when the brake pedal is not actuated and 0 V when the brake pedal is depressed.

Check 1, check valve
Voltage between terminals #17 (A#17) and #31 (#A31) should be 12 V.