Readiness Code

Readiness code must be generated when Engine Control Module (ECM) memory is cleared, battery voltage or ECM is disconnected. Readiness code appears on scan tool as an 8-digit display in display field 1 of MEASURING VALUE BLOCK - 086. Each of the 8 digits is related to a specific exhaust related system. During a test sequence OBD system checks function of each of the 8 systems. Test sequence once started must be run completely. During test sequence if test is successful scan tool changes display digits from "1" to "0". When readiness code is generated, display should read 0 0 0 0 0 0 0 0 in display field 1 of measuring value block 086. If during testing, a malfunction is recognized, a DTC is stored in memory. Retrieve DTCs and repair as necessary. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTICS SYSTEM in appropriate SELF DIAGNOSTICS article.

Readiness code is returned to 1 1 1 1 1 1 1 1 if DTC memory is erased, voltage supply to ECM is lost, or a new ECM is installed. To check readiness code, connect VAS 5051 or equivalent scan tool to DLC. DLC is located behind cover under left side of steering column. Turn ignition on. Using scan tool, select vehicle system 01 - ENGINE ELECTRONICS. From selection 1, select diagnostic function 08 - READ MEASURED VALUE BLOCK. From button field 2, enter 086 for DISPLAY GROUP - 086. Press "Q" button to confirm input. Using scan tool, observe display field 1 in display group 086. See Fig 1 and Fig 2 . Readiness code should display 0 0 0 0 0 0 0 0 0. If readiness code displays as specified, continue DTC testing. If no DTCs are stored testing is complete. If readiness code does not display as specified, generate readiness code. See GENERATING READINESS CODE .