Teves 04 With ABS Only
ABS, Teves 04, Distinguishing Features
With vacuum brake servo assistance
- 10" brake servo -1-
- 10 pins used on 15-pin valve block connector -2- (visible when disconnected).
Function
The ABS control module -J104- is equipped with Diagnostic Trouble Code (DTC) memory and On Board Diagnostic (OBD) capability. Up to Ol.93 the ABS control module -J104- is located in the right front footwell underneath the floor mat. From 01.93 the ABS control module -J104- is located under the rear seat, right.
Up to 07.93 the on board diagnostic Data Link Connectors (DLC) are located under a cover below the heating/ventilation controls. From 08.93 the DLC is behind a cover next to the ashtray.
The term "On Board Diagnostic (OBD)" refers to the electrical and electronic parts of ABS or ABS/EDL; in other words, only malfunctions related to the electrical connections to the ABS control module are recognized (e.g. inlet or outlet valve open circuit).
The control module recognizes malfunctions during ABS or ABS/EDL operation and stores them in permanent memory, the contents of which can be recalled years later even if battery power has been disconnected.
Isolated malfunctions that occur sporadically are also recognized and stored but, in contrast to other systems with On Board Diagnostic (OBD) capability, these are stored without the addendum "SP" (sporadic) in the scan tool display.
Malfunctions are stored with differing priorities: solenoid valve malfunctions have the highest priority, while sporadic malfunctions have the lowest priority.
After switching the ignition on, the ABS warning light -K47- lights up for approx. 2 seconds.
During this period.a self-test sequence is carried out by the ABS control module with checks of the following functions:
- Hydraulic pump run at low speed
- Brief valve activation after switching the ignition on
If an ABS malfunction is stored, ABS is switched off and the ABS warning light -K47- remains on.
If an EDL malfunction is stored, the EDL system is switched off. These malfunctions are not indicated by the ABS warning light
If ABS or ABS/EDL is switched off because a malfunction has been stored, the conventional hydraulic brake system remains fully operational.
The On Board Diagnostic (OBD) program must be initiated at the start of the troubleshooting process by checking for stored malfunction information using the VAG 1551 scan tool.
VAG 1551 Scan Tool
The Diagnostic Trouble Code (DTC) information displayed by the scan tool is used in conjunction with a DTC table, which lists possible causes of the malfunction and suggested repairs.
The OBD troubleshooting and repair procedures for ABS and ABS/EDL are identical. Both systems have control modules equipped with 55 pins. The On Board Diagnostic (OBD) operates in the rapid data transfer mode.
With the exception of the additional terminals assigned to the electronic differential lock system, the terminal assignments for the ABS control module -J104- 55-pin connector are identical for both Systems.
When performing the electrical test, carry out all test steps.
On Board Diagnostic (OBD), Technical Data
NOTE: The distinguishing features ofABS and ABS/EDL are:
- Additional electronic differential lock series resistance -N759- on ABS/EDL hydraulic unit
- Longer valve block for ABS/EDL than for ABS alone
ABS control module
When checking Diagnostic Trouble Code (DTC) memory, ABS control module identification will be displayed on the VAG 1551 scan tool.
Example:
- iHO 907 379 D ABS
- iHO 907 379 E ABS/EDL
For specific applications ref. Parts catalog microfiche
- Permanent memory (DTC memory); contents remain stored even without battery positive voltage (B+) supply.
Access to data by "Rapid data transfer" operating mode 1.