With VAG 1551

FUNCTION
The Engine Control Module (ECM) -J220- for the fuel injection and ignition system is equipped with a Diagnostic Trouble Code (DTC) memory.

If malfunctions occur in the sensors and components being monitored, they will be stored in the DTC memory together with an indication of the type of malfunction.

Malfunctions which only occur sporadically will be indicated on the display by the addition "/SP". The cause of sporadic malfunctions can be e.g. a loose contact or a brief open circuit. If a sporadic malfunction does not occur again within 40 engine starts, it will be erased from DTC memory.

The stored malfunctions are output after initiating the malfunction display See "Checking DTC Memory (Function 02)".

After malfunctions have been eliminated, DTC memory must be erased and the repair must be verified via the appropriate display group, see Readiness Code, Creating.

The readiness code must be created each time the DTC memory is erased and when the voltage supply to ECM -J220- is interrupted.

ON BOARD DIAGNOSTIC (OBD II) TECHNICAL DATA

Equipped with
- Diagnostic Trouble Code (DTC) memory
- Rapid data transfer

Engine control module identification
See VAG 1551 Scan Tool (ST), connecting and selecting Engine Electronics address word 01.

Engine Control Module (ECM) functions

NOTE: The ECM is equipped with various functions. Some functions can be carried out with ignition switched on or with engine running. The following table details the prerequisites for carrying out the individual functions.





1) Must be performed after the following work: replacement of Engine Control Module (ECM), throttle valve control module or engine.

2) Only possible when coolant temperature is about 80 °C (176 °F). Prior to this function is blocked.

3) Must be performed when checking idle speed.