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Readiness code
All electrical components are continuously checked for proper functioning within the framework of the EOBD. In addition, integrated systems (e.g. exhaust gas recirculation system) are checked by non-continuous diagnostic routines.
The readiness code is set to check whether these diagnoses were performed or not. The readiness code consists of an 8-character number code; a 0 (diagnosis performed) or a 1 (diagnosis not performed) can be assigned to each digit position. The engine control unit sets the readiness code when:
- the readiness code is cancelled
- the engine control unit is put into operation
for the first time.
The readiness code does not check for faults occurred; it indicates only whether diagnoses were performed. If the diagnoses produce no erroneous entries, the systems are in proper service condition.
The readiness code marked above represents the performance status of the following systems in the given order:
- Catalyst
- Catalyst heating
- Fuel tank purging system
- Secondary air system
- Air conditioning system
- Lambda probe
- Lamdba probe heater
- Exhaust gas recirculation
Read out readiness code
There are two possible ways to read out the readiness code.
- Using any Generic Scan Tool (OBD visual display unit) or
- Using the Vehicle Diagnostic, Testing and Information System VAS 5051.
The procedures are explained on the following pages.
Generate readiness code
The readiness code can only be generated by running the diagnoses. There are three possible ways to do this:
- Perform an NEFZ (Neuer Europäischer Fahrzyklus = new European driving cycle). However, the standard workshop will be unable to perform the NEFZ on a roller dynamometer upon completion of repair work.
- Run the vehicle in average operating mode for long enough (this may necessitate several trips).
- Using the VAS 5051 diagnostic system, perform a defined test routine (short trip) for each relevant vehicle system.
The procedure is also explained in Vehicle Diagnostic, Testing and Information System VAS 5051.
— Euro On-Board Diagnostic System For petrol engines Self-Study Programme 231, © VOLKSWAGEN AG, Wolfsburg
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