Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. Workshop Manual Audi A4 1995 ➤ Electrical system, self-diagnosis Edition 12.2005 Service Service Department. Technical Information
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. 10 Checking data exchange between control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 10.1 Checking “two-wire bus system” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 Audi A4 1995 ➤ Electrical system, self-diagnosis - Edition 12.2005 Contents iii
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. Audi A4 1995 ➤ Electrical system, self-diagnosis - Edition 12.2005 iv Contents
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. 01 – Self-diagnosis 1 Connecting vehicle diagnostic, test‐ ing and information system -VAS 5051B- 1.1 Safety precautions Note the following if testers and measuring instruments have to be used during a test drive: WARNING ♦ Always attach the testers and measuring instruments to the rear seat and have them operated from there by a second person. ♦ If testers and measuring instruments were to be operated from the front passenger's seat, the person sitting there could be injured by triggering of the front passenger's air‐ bag in an accident. Heed the following so as to avoid possible injury and/or the de‐ struction of electrical and electronic components: ♦ Always switch off ignition before disconnecting and connecting measuring instruments and testers. ♦ Certain tests may lead to a fault being detected by the control unit and stored. The fault memory should therefore be inter‐ rogated and (if necessary) erased after completing all tests and performing any repair work. ♦ Always switch off the ignition before connecting or discon‐ necting the battery, as otherwise electronic control units could be damaged. Conditions: • Vehicle power supply OK • Corresponding system fuses OK ⇒ Current flow diagrams, Electrical fault finding and Fitting locations • Battery earth strap and, if fitted, earth strap between battery and gearbox OK • Battery voltage min. 12.5 V • Vehicles with automatic gearbox: Selector lever set to “P” or “N” and handbrake applied – Check earth connections for corrosion and damage and repair if necessary ⇒ Current flow diagrams, Electrical fault finding and Fitting locations. Audi A4 1995 ➤ Electrical system, self-diagnosis - Edition 12.2005 1. Connecting vehicle diagnostic, testing and information system VAS 5051B 1
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. Sequence of operations – Open the rear ashtray and remove the cover for the diagnostic connector. – Connect up the vehicle diagnostic, testing and information system -VAS 5051B- with the diagnostic wire -VAS 5051/1- , touch the vehicle self-diagnosis key and select vehicle system “01 - Engine electronics”. The engine must be idling when doing so. WARNING Heed safety precautions ⇒ page 1 . Note If a fault message appears on the display, refer to ⇒ Operating instructions of vehicle diagnostic, testing and information system -VAS 5051B- . – Switch on ignition. Or – Start engine. Display on -VAS 5051B- : – Touch vehicle self-diagnosis key. Audi A4 1995 ➤ Electrical system, self-diagnosis - Edition 12.2005 2 Rep. Gr.01 - Self-diagnosis
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. Display on -VAS 5051B- : Note Touching the function “00 - Interrogating fault memory - Overall system” in the list -1- implements the automatic test sequence, i.e. the fault memories of all systems with self-diagnosis capability in the vehicle are interrogated. – In the list -1-, touch the required vehicle system, e.g. “17 - Dash panel insert”. Audi A4 1995 ➤ Electrical system, self-diagnosis - Edition 12.2005 1. Connecting vehicle diagnostic, testing and information system VAS 5051B 3
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by AUDI AG. 2 Dash panel insert self-diagnosis up to Model Year 1999 2.1 General information Technical features of dash panel insert ♦ Two different dash panel inserts are fitted: Midline: With Minicheck system Highline: With driver information system (DIS) ♦ The speedometer contains an LCD display for the mileage counter, trip recorder and service interval display. ♦ The warning lamps are integrated into the speedometer and rev counter. ♦ The dash panel insert is controlled by a microprocessor and is provided with comprehensive self-diagnosis. Any faults oc‐ curring at system components cause fault codes to be stored in the dash panel insert fault memory. The faults can be es‐ tablished by way of the vehicle diagnostic, testing and infor‐ mation system -VAS 5051B- . ♦ Adaption functions can also be implemented. “dEF” display in trip recorder “dEF” appears on the trip recorder display if the control unit in the dash panel insert detects a fault at the read-only memory. If “dEF” is displayed: – Replace the dash panel insert ⇒ Rep. Gr. 90 . Dash panel insert replacement ♦ The dash panel insert is not to be dismantled. ♦ Warning lamps in the form of bulbs can be replaced separately ⇒ Rep. Gr. 90 . ♦ If necessary, the dash panel insert is to be replaced as part of the exchange system. ♦ Complete the damage report and return it together with the dash panel insert. ♦ Always use the original packaging when returning the unit. ♦ On dash panel insert replacement, mileage counter and serv‐ ice interval display adaption can be performed using the ve‐ hicle diagnostic, testing and information system -VAS 5051B- ⇒ page 18 . Audi A4 1995 ➤ Electrical system, self-diagnosis - Edition 12.2005 4 Rep. Gr.01 - Self-diagnosis
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