Testing Functions of On-Board Diagnostics II

Memory:
- Temporary memory and permanent memory (If the engine control module is disconnected from the Battery Positive Voltage (B+) supply, the readiness code and learning values will be erased. Any malfunctions stored in DTC memory are not erased).

Data Output:
- Rapid data transfer
- Additional malfunction indication by Malfunction Indicator Lamp (MIL) lighting up

ECM Identification:
- VAG 1551 Scan Tool (ST), connecting and selecting "Engine Electronics" address word 01.

ECM Functions:
- The Motronic ECM -J220- performs different OBD functions, carried out with the ignition switched on or with the engine running. Following are the conditions required to carry out each of the specific functions.

Address Words:
Address word 00:
- Automatic Test Sequence (Switch ignition on or let engine idle).
Address word 01:
- Engine Electronics (Switch ignition on or let engine idle).

Functions under "Engine Electronics" address word 01:
Function 01:
- Check Control Module Versions (Switch ignition on or let engine idle.)
Function 02:
- Check DTC Memory (Let engine idle, or, crank engine with starter for at least 5 sec., then do not switch ignition off).
Function 03:
- Output Diagnostic Test Mode (Switch ignition on).
Function 04:
- Basic Setting (Let engine idle).
Function 05:
- Erase DTC Memory
Function 06:
- End Output
Function 07:
- Code Control Module (Switch ignition on).
Function 08:
- Read Measuring Value Block (Switch ignition on or let engine idle, or driving).
Function 10:
- Adaptation