Version Coding W/HHT Starting 03/94 (Up To HHT Diagnosis Identification 45)

NOTE: If returning a new control module to a PDC, the code number must be reused.

Before replacement of the engine control module, the existing code number must be read and stored with the HHT (menu selection 6 "Version Coding"). After installation of the new control module, the previously read code number must be entered.
If the code number can NOT be read, the vehicle equipment/version must be determined, the corresponding code number obtained and manually entered with the HHT.
When performing a trial installation of a control module with the same part number from another vehicle (up to model year 1995), but with a different code number, the following must be observed:
- Read and record code number from vehicle with complaint.
- Exchange control modules.
- Read and record code number from the exchanged control module.
- Enter the code number from the original control module into the exchange control module.
- Perform function test.
- Before returning control module to other vehicle, enter recorded code number into exchange control module.
- Exchange control modules.

Drive Authorization System, Stage 2, 2B, 3 (DAS)

Upon replacement the engine control module must be version coded using the HHT. Additionally, the code number and VIN must be entered.