BOSCH ABS 5.7 - System Overview
The ABS 5.7, fitted to all Rover 75 and ZT models including Tourers, also the SV series, is an evolution of the 5.3 with a smaller and lighter valve block to which the ECU is attached. Although the main job of this system is to keep the brakes from completely stopping the rotation of the wheels, allowing the driver maximum braking efficiency to stop in the shortest distance and still keep proper steering control, It also has the capability to provide traction control functionality. In the case of the diesel (M47) this is achieved by the ABS 5.7 ECU communicating directly with the engine management to reduce power, however on the V6 models this communication with the EMS is supplemented by an additional ECU which controls a secondary butterfly flap in the intake manifold being added. The ABS 5.7 although similar in appearance should not be confused with the DSC 5.7 ECU the main difference being that this system provides traction control functionality by sensing wheel speed differentials with the addition of traction control capability. The DSC5.7 provides stability control by interfacing with a multitude of sensors, its control also extending to ABS functionality.

Please Note: The ABS 5.7 ECU will not engage in diagnostic communication while the vehicle is moving. The ECU will exit the diagnostic mode whenever the vehicle speed exceeds 14 km/h (8.6 mph). The communication will be restored again when the speed falls below 14 km/h (8.6 mph).
SM079 - BOSCH ABS 5.7 - System Help file
Version 1.22

BOSCH ABS 5.7 - Known Fitments
Vehicle makes, models and variants known or believed to be using this vehicle system, required diagnostic lead and degree of known compatibility.

Vehicle Make Vehicle Model Vehicle Variant Diagnostic Lead
Rover 75 All Models Black OBDII Lead
Rover 75 Tourer All Models Black OBDII Lead
MG SV All Models Black OBDII Lead
MG ZT All Models Black OBDII Lead
MG ZT-T All Models Black OBDII Lead
MG SV-R All Models Black OBDII Lead

BOSCH ABS 5.7 - Physical Details

BOSCH ABS 5.7 - Pin Outs
Details of the pin usage for the ECU connector(s).

 
1 Earth
2 Battery supply
3 - 4 Not used
5 Earth
6 Battery supply
7 Throttle position request (only on KV6 models with ETC)
8 - 10 Not used
11 Diagnostic ISO 9141 K line
12 Front left ABS sensor
13 Rear left ABS sensor
14 Rear left ABS sensor
15 Front right ABS sensor
16 Front right ABS sensor
17 Brake system/ handbrake/ EBD warning lamp
18 Front right wheel speed (to instrument pack)
19 Rear right wheel speed (to navigation system)
20 Throttle position response (only on KV6 models with ETC)
21 Not used
22 Traction control reset (only on KV6 models with ETC)
23 Ignition supply
24 CAN bus, high line (only on models with ETC)
25 - 26 Not used
27 ETC switch (only on models with ETC)
28 Front left ABS sensor
29 Not used
30 Rear right ABS sensor
31 Rear right ABS sensor
32 Brake switch
33 ABS warning lamp
34 Rear left wheel speed (to navigation system) Output
35 Front left wheel speed (to ECM and cruise control ECU)
36-39 Not used
40 CAN bus, low line (only on models with ETC)
41 - 42 Not used

SM079 - BOSCH ABS 5.7 - Diagnostic Capabilities (Read Fault Codes)
Reads the fault code memory. The system can self detect up to 41 different problems with itself and associated sensors, storing the respective code if it detects any malfunction or reading outside of pre defined acceptable limits. Not all stored faults may cause the fault warning lamp to illuminate.

SM079 - BOSCH ABS 5.7 - Diagnostic Capabilities (Clear Fault Codes)
Clears the fault code memory.

SM079 - BOSCH ABS 5.7 - Diagnostic Capabilities (Settings)
Values, configuration settings and other stored information which can be read from the ECU, edited and then rewritten back. Read settings can also be stored as a standard HTML page for reference. These pages can then later be re loaded and re written back to the ECU. Please note that some values may be read only due to the fact that they are supplied from the ECU’s ROM or are internally calculated.

  • Part Number: This is the part number for the ECU.
  • Hardware Number: This is the hardware version which denotes the processor and circuit board type.
  • Software Number: This denotes the coding inside the processor for the hardware.
  • Week and Year of Manufacture: This is the week and year in which the unit was built.
  • ECU Manufacture Part Number: This is the part number assigned to the ECU by the manufacturer.
  • ECU Type Number: Denotes ECU sub-variation type.
  • Coding Index: This is the coding identification for the programming maps.
  • Diagnostic Index: This is a number that indicates the diagnostic capabilities support level.
  • Bus Index: This is a number that indicates the bus communication support level, the vehicle communication buses.
  • Supplier Number: This is a number which defines the supplier using a standard look up list of supplier ECU manufacturer numbers.

SM079 - BOSCH ABS 5.7 - Diagnostic Capabilities (Inputs)
Constantly updating display in HTML of real time information the electronic control unit of the selected vehicle system is currently deriving from its input sensors and switches. These displays can be saved as HTML snap shots, recorded as an AVI movie or captured as A CSV data file for import into a spread sheet program such as Excel.

  • Throttle Demand: Gives the overall primary and secondary throttle demand, as a percentage of total demand. Calculated by the EMS and given to the ABS ECU via the CAN bus. Used to reduce the torque by closing the secondary throttle during wheel slip conditions (only for vehicles fitted with traction control).
  • Engine Speed: Gives the engine speed as seen by the ABS ECU, which it obtains from the engine ECU via the CAN interface. This value is used for calculation of the final torque.
  • Throttle Position: Gives the general position of the primary and secondary throttle plates as a percentage of their total movement, derived from throttle feedback. ABS ECU value (only for vehicles fitted with traction control).
  • Traction Control Switch: Gives the state of the traction control switch. On or Off. (Pressed or not respectively) (only for vehicles fitted with traction control).
  • Brake Switch: Gives the state of the brake light switch. On or Off. (Depressed or not respectively).
  • Front Left Wheel Speed: Gives the front left wheel speed signal as read by the ECU. When the vehicle is stationary the registered speed should be less than 2km/h.
  • Front Right Wheel Speed: Gives the front right wheel speed signal as read by the ECU. When the vehicle is stationary the registered speed should be less than 2km/h.
  • Rear Left Wheel Speed: Gives the rear left wheel speed signal as read by the ECU. When the vehicle is stationary the registered speed should be less than 2km/h.
  • Rear Right Wheel Speed: Gives the rear right wheel speed signal as read by the ECU. When the vehicle is stationary the registered speed should be less than 2km/h.

SM079 - BOSCH ABS 5.7 - Diagnostic Capabilities (Outputs)
Choice of outputs that can be tested. The outputs would be pulsed.

  • System Static Test: Forcing this output activates system and tests response time of pumps and valves, registering any fault codes and storing them. Test should not be carried out if fault codes exist in memory.
  • ABS Warning Lamp: Forcing this output causes the ABS warning light to flash on and off.
  • Brake Warning Lamp: Forcing this output causes the brake system warning light to flash on and off.
  • Traction control switch secondary throttle - Decrease engine speed: This test is available only for petrol vehicles fitted with traction control and it checks the function of the traction control secondary throttle. For this test is necessary to have the engine running (2500 - 3500 rpm). The engine speed should decrease.
  • Traction control switch secondary throttle - Increase engine speed: This test is available only for petrol vehicles fitted with traction control and it checks the function of the traction control secondary throttle. For this test is necessary to have the engine running (2500 - 3500 rpm). The engine speed should increase.

SM079 - BOSCH ABS 5.7 - Diagnostic Capabilities (Other)
Choice of functions that can be performed.

  • Secondary Brake Bleed Rear Right: Bleeds rear right brake. The relevant bleed nipple needs to be open before initiating the test. The user will be required to instantly press and release the brake pedal and prompted when to not operate the brake pedal anymore and to close the valve. This requires two people.
  • Secondary Brake Bleed Rear Left: Bleeds rear left brake The relevant bleed nipple needs to be open before initiating the test. The user will be required to instantly press and release the brake pedal and prompted when to not operate the brake pedal anymore and to close the valve. This requires two people.
  • Secondary Brake Bleed Front Right: Bleeds front right brake. The relevant bleed nipple needs to be open before initiating the test. The user will be required to instantly press and release the brake pedal and prompted when to not operate the brake pedal anymore and to close the valve. This requires two people.
  • Secondary Brake Bleed Front Left: Bleeds front left brake. The relevant bleed nipple needs to be open before initiating the test. The user will be required to instantly press and release the brake pedal and prompted when to not operate the brake pedal anymore and to close the valve. This requires two people.
  • Traction control bleed front right: Bleeds front right traction control. The relevant bleed nipple needs to be open before initiating the test. The user will be required to instantly press and release the brake pedal and prompted when to not operate the brake pedal anymore and to close the valve. This requires two people.
  • Traction control bleed front left: Bleeds front right traction control. The relevant bleed nipple needs to be open before initiating the test. The user will be required to instantly press and release the brake pedal and prompted when to not operate the brake pedal anymore and to close the valve. This requires two people.
  • Front Left Wheel Lock: This test requires two people. When prompted, one person presses the break pedal whilst the other turns the wheel. Since disabled wheel should not be locked. Vehicle must be in neutral and handbrake disengaged.
  • Front Right Wheel Lock: This test requires two people. When prompted, one person presses the break pedal whilst the other turns the wheel. Since disabled wheel should not be locked. Vehicle must be in neutral and handbrake disengaged.
  • Rear Right Wheel Lock: This test requires two people. When prompted, one person presses the break pedal whilst the other turns the wheel. Since disabled wheel should not be locked. Vehicle must be in neutral and handbrake disengaged.
  • Rear Left Wheel Lock: This test requires two people. When prompted, one person presses the break pedal whilst the other turns the wheel. Since disabled wheel should not be locked. Vehicle must be in neutral and handbrake disengaged.
  • Read Bleed Status: When ABS is first bled on production line the success or failure of the bleed is stored in the ABS. This function always reads the outcome of this first bleed test.