With Manufacturer's Scan Tool

On Board Diagnostic (OBD)

Function

The Multiport Fuel Injection (MFI) system is equipped with a Motronic Engine Control Module (ECM) -J220- with On Board Diagnostic (OBD) capability.

When malfunctions occur in sensors or components monitored by OBD, Diagnostic Trouble Codes (DTC) are stored in DTC memory.

After evaluating the malfunction information the ECM decides between 149 different DTCs and stores these until DTC memory is erased.

DTCs that are recognized as a result of intermittent malfunctions are classified as sporadic malfunctions. These are identified by the designation "SP" appearing in the display. The cause of sporadic malfunctions can be a loose wire connection or a brief open circuit. A sporadic malfunction will be erased if it no longer occurs after 40 warm-up cycles (engine coolant temperature below 50°C (122°F) on start-up and above 72°C (162°F) when shut off).

Stored DTCs are identified using the VAG1551 Or VAG1552 ScanTool (ST).
The readiness code can be displayed on the VAG1551 or VAG1552 scan tool Monitors, Trips, Drive Cycles and Readiness Codes

The readiness code is reset and/or erased and must be regenerated every time DTC memory is erased, the power supply to the ECM -J220- is interrupted (e.g. when connecting VAG1598/22 test box), or the battery has been disconnected. Monitors, Trips, Drive Cycles and Readiness Codes