About Trouble Codes

Diagnostic Trouble Code (DTC) table


NOTE:
- DTC changes affecting m.y. 1997 - On vehicles.
- Diagnostic Trouble Codes (DTC) recognized by A/C control head -E87- and displayed on VAG1551 Scan Tool (ST).
- If malfunctions occur only occasionally or if the DTC memory was not erased after repairs, such DTC are displayed as "sporadic faults". (The contents of DTC memory is retained until erased, "permanent memory").
- DTCs and flash codes (only for specific components) appear only in the printout in operating mode -1-, (Rapid data transfer).
- In addition to displayed DTC and affected component descriptions, malfunction cause information is listed in the table below the DTC code.
- After performing repairs and operating the A/C system, DTC memory must always be checked again to confirm the repair.
- Before replacing a suspected malfunctioning component, check all appropriate wiring, connections, harness connectors and Ground (GND) connections.
- When checking for the cause of sporadic faults, check all plug connections and wiring between A/C control head -E87- and any component recognized as being inoperative using wiring diagram.
- After replacing AC/heating system components, always perform basic setting (function 04), check DTC memory (function 02). After repair, erase DTC memory and end output (functions 05 and 06).
- Use VAG1598 Test Box with cables VAG1598/11 and VAG1598/12 when testing DTC related wiring/connections to A/C control head -E87- and always refer to current wiring diagram.
- If A/C control head -E87- continues to operate after ignition is switched off, check wiring to -E87- terminal -D1- for short circuit to positive using wiring diagram.
- If 22 °C (72 °F) is always displayed after switching ignition off and on, regardless of last setting, check power supply (terminal 30) to A/C control head -E87- using wiring diagram.
- If a malfunction is recognized at an air/temperature distribution flap motor potentiometer, air distribution can be altered by pressing buttons on A/C control head -E87-.
- To switch display from °C (Celsius) to °F (Fahrenheit) (and vice versa), press "Temperature +" button while holding recirculating air" button.
- If no DTC are displayed and air conditioning system complaints exist (e.g. compressor does not run or only occasionally, system control unsatisfactory, speed of fresh air blower cannot be regulated etc.), perform function 03 "Output Diagnostic Test Mode (DTM)" and 08 "Read Measuring Value block".