TERMINAL
Front wheel sensor
Scheme 44
Rear wheel sensor
| Connector terminal | Control module terminal | Signal type | Other |
|---|---|---|---|
| #1 | #45 | Power supply, front left | The sensor receives 12 V from the control module. |
| #14 | Signal output left front | Taxi signal. The signal can be used to check the wheel sensor's signal | |
| #2 | #46 | Signal ground | The sensor is grounded through the control module. |
| #1 | #36 | Power supply, rear left | The sensor receives 12 V from the control module. |
| #9 | Signal output left rear | Taxi signal. Can be used to check the wheel sensor's function | |
| #2 | #37 | Signal ground | The sensor is grounded through the control module. |
| #1 | #34 | Power supply, front right | The sensor receives 12 V from the control module. |
| #11 | Signal output right front | Taxi signal. Can be used to check the wheel sensor's function. | |
| #2 | #33 | Signal ground | The sensor is grounded through the control module. |
| #1 | #43 | Power supply, rear right | The sensor receives 12 V from the control module. |
| #7 | Signal output right rear | Taxi signal. Can be used to check the wheel sensor's function. | |
| #2 | #42 | Signal ground | The sensor is grounded through the control module. |
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 approx. U Low
Gap against sensor U approx. U bat
Scheme 45
Scheme 46
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 approx. 0.15 V (brake pedal not actuated)
38.5 mm approx. 4.75 V (brake pedal depressed)
Other information
None.
Scheme 47
| Connector terminal | Control module terminal | Signal type | Ignition on | Other |
|---|---|---|---|---|
| #1 | #26 | Power supply | U = 5 V | The sensor receives 5 V from the control module. |
| #2 | #27 | Signal ground | U = 0 V | |
| #3 | #38 | Signal voltage | U = 0.15 - 4.85 V |
Prerequisites (unless otherwise specified)
- Breakout box connected
- Sensor connected
- Ignition switch position II
Check 1
Voltage between terminals #A3 and #A21 should be approx.0.15 V when the brake pedal is not actuated and up to approx.4.85 V when the brake pedal is depressed.
GENERAL
Type
Vacuum pressure sensor: Double piezo resistive 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 should be similar to diagram below.
Work chamber (2): Voltage between terminals 41 (A#41) and #40 should be similar to diagram below.
Scheme 48
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.
