SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 61 (ON BOARD DIAGNOSTIC (OBD) - A/T 01L)CAN-BUS, FUNCTIONTWO-WIRE BUS SYSTEM, CHECKINGTHREE OR MORE CONTROL MODULES COMMUNICATE THROUGH A "TWO-WIRE BUS SYSTEM"EXAMPLE 3
1996 Audi A4 Base, Standard

Example 3

1996 Audi A4 Base, StandardSECTION Example 3
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi RS 6. However, it is still accessible from the selected car via links, so may be relevant.

Based on DTCs stored in the memory of the control modules you can tell that none of the control modules transmit or receive.

CONTROL MODULE DTC - EXAMPLE 3

Control module DTCs stored in memory:
1 Hardware faulty
2 Hardware faulty
3 Hardware faulty
  • Switch off ignition.
  • Disconnect Bus-wiring from all control modules and check wiring for short circuit between wires.
Fig 1: Schematic - Checking Wiring For Short Circuit Between Wires
G02722659Courtesy of AUDI OF AMERICA, INC.
  • Check Bus-wiring for open or short circuit to plus (B+) or to Ground (GND).
    Fig 2: Schematic - Checking Bus-Wiring For Open Or Short Circuit To Plus (B+) Or To Ground (GND)
    G02722660Courtesy of AUDI OF AMERICA, INC.
  • If Bus wiring are OK, check for short circuit between all control modules and Bus wiring to plus (B+) or Ground (GND).

Disconnect one control module after the other and check whether fault "Hardware faulty" has been corrected.

If yes, replace the disconnected control module. If not, reconnect the control modules again and disconnect the next control module connected to the Bus.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.