Readiness Code, Reading

Function 

The readiness code is an 8 digit number block that indicates the results of an exhaust related On Board Diagnostic (OBD).

If a diagnostic for a system has run through successfully, the respective digit of the number block is set from 1 to 0.

On Board Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an exhaust relevant system, the readiness code should be generated via a road test to ensure that these systems are working according to specifications. If a malfunction is recognized during diagnostic, it is stored in DTC memory.

The readiness code is erased every time DTC memory is erased or when voltage supply is interrupted. DTC memory should therefore only be erased when there are DTCs stored.

Prerequisites 

• There must not be any DTCs stored in DTC memory → Diagnostic Mode 03 - Read DTC Memory  .
• Coolant temperature must be at least 80 C → Diagnostic Mode 01 - Read Current System Data  ; PID 5, Coolant temperature.

Procedure 

• Connect diagnostic tester → Diagnostic Tester, Connecting .
• Start engine and let run at idle.
• Under address word 33, select "Diagnostic mode 1: Checking measured values."
• Select desired measuring value "PID 01".

• Observe right 8-digit number block:

If all diagnostics have run through successfully, the following specified value 8-digit number block must appear.

• Specified value: displaying 00000000.

Evaluation PID 01: System status-information (right 8-digit number block:) 

If a 1 is displayed instead of a 0 in the 8-digit number block:

• Generate readiness code → Readiness Code, Generating .