Cis-E III

Locate 2 diagnostic connectors in driver footwell area. Connect a test light between connectors "A" and "B". See Fig 1 .

Fig 1: Identifying Diagnostic Connectors
Courtesy of AUDI OF AMERICA, INC.

NOTE: If ICU is replaced, check ignition timing. If warning light flashes while driving, knock regulation is at maximum control limit.
Connect jumper wire to other terminal in connector "A". Touch other end of jumper wire to remaining terminal in connector "B" for at least 4 seconds. Fault codes will now be displayed by flashing CHECK ENGINE light (California vehicles) or flashing test light (Federal vehicles). These fault codes are from Ignition Control Unit (ICU).
NOTE: Pay careful attention to flashing light since no discernible break points exist between 4-digit fault codes.
Trouble codes will be flashed as 4-digit numbers. A 1/2-second pause occurs between flashes. Add flashes together to obtain code for each of four digits. See Fig 2 . Flashing ENGINE light is shown, using test light is similar. A 2 1/2-second pause will occur before code for next digit is flashed. After code for fourth (last) digit is flashed, another 2 1/2-second pause occurs.

Fig 2: Reading Diagnostic Codes (Calif. Models, Federal Models Are Similarly Read Using Test Light)
Courtesy of AUDI OF AMERICA, INC.
To advance to next fault code, touch end of jumper wire to remaining terminal in connector "B" again for at least 4 seconds. See Fig 1 .
Display fault codes until Code 0000 is displayed. Code 0000 is identified by light repeatedly coming on for 2 1/2 seconds and then going off for 2 1/2 seconds. This indicates all fault codes from ICU have been displayed.
After Code 0000 is displayed, repeat step 4) to display fault codes from Fuel Injection Control Unit (FICU). Engine speed may increase. Record all codes.
Repeat step 4) until all FICU fault codes have been displayed. When all fault codes from FICU have been displayed, a Code 0000 will be displayed. For a list of all fault codes and possible problems, refer to CIS-E III FAULT CODE IDENTIFICATIONS table.
Check and repair circuits and/or sensors as indicated. See appropriate test in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. After fault is corrected, repeat step 4) and check for additional codes.

NOTE: ICU and FICU terminal identifications are located on respective connectors on vehicle.

CIS-E III FAULT CODE IDENTIFICATIONS

Code

System Affected

Probable Cause

1111

ICU Or FICU

Defective Memory Circuits

1231

Speed Sensor

Signal Not Being Received

2121

Idle Switch

Switch Stuck Closed Or Wiring Problem

2122

Engine Speed Signal Or Hall Sender

⁽¹⁾ No Engine Speed Signal

2123

Full Throttle Switch

Switch Stuck Closed Or Wiring Problem

2132⁽²⁾

No Data Transmitted From FICU To ICU

Open wire

2141

Knock Regulation

⁽³⁾ Engine Or Ignition Knock

2142

Knock Sensor

Defective Sensor Or Sensor Wiring

2223

Altitude Sensor

No Signal From Sensor

2232

Airflow Sensor

⁽⁴⁾ No Signal From Sensor To FICU

2233

Air Sensor Reference Voltage

⁽⁵⁾ No Reference Voltage

2312

Coolant Temp Sensor

No Signal From Sensor

2341

O2 Sensor Control

2342

O2 Sensor

No Signal From Sensor

2431

EGR System

Valve Stuck Or Wiring Problem

4431

Idle Stabilization Valve

Problem In Wiring To Valve

4444

No Faults Stored

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0000

End Of Diagnosis

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⁽¹⁾	From ICU Terminal No. 17

⁽²⁾	If this code is set, verify control unit part numbers are as follows; Ignition ECU - 443-906-264-F ("E" indicates California). Fuel injection ECU-443-907-397-M.

⁽³⁾	This will cause ignition timing to be retarded to maximum limit.

⁽⁴⁾	Another cause could be an open circuit between FICU terminal No.21 and ICU terminal No. 8.

⁽⁵⁾	Between ICU terminal No. 21 and FICU terminal No. 26.