CIS Motronic Engine Code 3B
On California models, codes are read by observing the flashing CHECK light on the instrument panel. See Fig 1 . See CIS MOTRONIC ENGINE CODE 3B FAULT CODES table.
On Federal models, retrieving codes requires use of a VAG 1551 tester. See tool manufacturer's instructions.
On Federal and California models, codes must be retrieved before they can be erased, and codes must be erased with VAG 1551 . Follow tool manufacturers instructions and screen prompts.
CIS MOTRONIC ENGINE CODE 3B FAULT CODES
| Code | Probable Cause | ||
|---|---|---|---|
| 2111 | Defective ECU | ||
| 2112 | No RPM Signal From Hall Sensor or Airflow Sensor Plate Not Moving Freely | ||
| 2121 (1) | Defective Idle Switch | ||
| 2123 | Defective Full Throttle Switch | ||
| 2141 | Knock Control At Control Limit | ||
| 2142 | Knock Sensor Signal | ||
| 2231 (1) | Adjustment Limits of Idle Stabilization Exceeded | ||
| 2232 | Airflow Sensor Potentiometer | ||
| 2312 | Coolant Temperature Sensor | ||
| 2341 | O2 Sensor Control At Control Limit | ||
| 2342 | O2 Sensor Control | ||
| 2343 (1) | Adjustment Limits of Fuel Mixture Exceeded (Too Lean) | ||
| 2344 (1) | Adjustment Limits of Fuel Mixture Exceeded (Too Rich) | ||
| 4431 (1) | Idle Stabilizer Valve | ||
| 4444 (1) | No Faults Recognized | ||
| 0000 | End of Fault Output Display | ||
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