Trouble Codes
- Drive vehicle for a minimum of 5 minutes to allow fault information to be stored. If a no-start condition exists, operate starter for at least 6 seconds.
CAUTION:
DO NOT turn ignition off. This will erase the fault memory.
Courtesy of AUDI OF AMERICA, INC.
- Insert fuse into fuel pump relay for at least 4 seconds. See Fig 1
. Indicator light on instrument cluster should display a 4 digit fault code from ICU.
- If indicator light displays a Code 4444, no faults have been recorded. Record all fault codes by repeating step 2) until a Code 0000 is displayed. This indicates that all fault codes from ICU have been displayed.
- Repeat step 2) after Code 0000 is displayed. This time, however, faults that are displayed will be from FICU. Engine speed may increase. Record all codes.
- Repeat step 2) until all FICU fault codes have been displayed. When all fault codes from FICU have been displayed, a Code 0000 will display.
- For a list of all ICU and FICU fault codes, refer to SELF-DIAGNOSTIC FAULT CODES
table.
SELF-DIAGNOSTIC FAULT CODES
| Code |
Location of Fault |
Problem |
| 1111 |
ICU or FICU |
Defective Memory Circuits In Control Unit |
| 2121 |
Idle Switch |
Switch Stuck Closed or Problem in Wiring to Switch |
| 2122 |
Engine Speed Signal or Hall Sender |
No Engine Speed Signal from ICU Term. No. 17 |
| 2123 |
Full Throttle Switch |
Switch Stuck Closed or Problem in Wiring to Switch |
| 2132 |
No Data Transmitted from FICU to ICU |
Disconnected or Open Wire between ICU Term. No. 5 & FICU Term. No. 1 or ICU Term. No. 3 & FICU Term. No. 13 or Defective Control Units |
| 2141 |
Knock Regulation |
Engine or Ignition Knock is Causing Timing to be Retarded (Max. Limit) |
| 2142 |
Knock Sensor |
Defective Sensor or Sensor Wiring |
| 2223 |
Altitude Sensor |
No Signal from Sensor |
| 2232 |
Air Sensor |
No Signal from Sensor to FICU or Break in Wire between FICU Term. No. 21 & ICU Term. No. 8 |
| 2233 |
Reference Voltage for Air Sensor & Altitude Sensor |
No Reference Voltage from ICU Term. No. 21 & FICU Term. No. 26 |
| 2312 |
Cool. Temp. Sensor |
No Signal from Sensor |
| 2341 |
O2 Sensor Control |
O2 Sensor Control Operating at Rich or Lean Limit |
| 2342 |
02 Sensor |
No Signal from Sensor |
| 4431 |
Idle Stab. Valve |
Problem in Wiring to Idle Stab. Valve |
| 4444 |
No Faults Stored |
N/A |
| 0000 |
End of Diagnosis |
N/A |