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Home >> Audi >> 2002 >> S4 Quattro, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.7L Turbo >> Self-Diagnostic System >> Generating Readiness Code >> Notes

Generating Readiness Code: Notes

NOTE: While limited diagnostic information is available, vehicle manufacturer does not support diagnostic information using aftermarket scan tools. To properly diagnose vehicle, it is recommended to use VAS 5051 scan tool with VAS 5051/1 adapter cable or VAG 1551 scan tool with 1551/3A adapter cable and VAG 1598/31 test box.
NOTE: During readiness code generating procedure, if after selecting a display group test result is indicated as "OK". Testing has already been carried out and it is okay to proceed to next work step.

Before reading readiness code, perform a long road test. Coolant temperature needs to be greater than 176°F (80°C). Idle, partial throttle, full throttle and overdrive, must all be attained several times. During test drive, apply full throttle until engine speed exceeds 3500 RPM. OBD system checks components and generates Readiness Code at regular intervals during normal driving. Readiness code is erased if DTC memory is erased or voltage supply to ECM is lost.

Readiness code must be generated when Engine Control Module (ECM) memory is cleared, battery voltage is disconnected or ECM is disconnected. To generate readiness code, vehicle must be stationary, transmission in Park or Neutral, all electrical consumers off, A/C switched off and coolant temperature at least 176°F (80°C). If possible it is best to warm-up vehicle by test driving. Connect VAS 5051 or equivalent scan tool to DLC. DLC is located behind cover under left side of steering column.

Ways To Generate Readiness Code -  . There are two ways to generate Readiness Code:

  1. By performing a long road test. Coolant temperature needs to be greater than 176° F (80° C). Idle, partial throttle, full throttle and overdrive, must all be attained several times. During test drive, apply full throttle until engine speed exceeds 3500 RPM. This initiates necessary relevant exhaust emission diagnostics and Readiness Code is then generated when OBD (ECM) verifies readiness of tested exhaust emission components (Readiness Code is generated at regular intervals during normal driving). Read readiness code. See READING READINESS CODE . If Readiness Code displays 0 0 0 0 0 0 0 0, Readiness Code was generated on test drive and no further Readiness Code diagnostics are necessary.
  2. By using scan tool and following a specific Test Procedure. See READINESS CODE TEST PROCEDURE .

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