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When the test has initialized, using the scan tool, monitor the evaporative valve duty cycle, CCV status, and the FTPS (the scan tool should give an indication when the test is active). When the test has initialized (CCV closed), it will take up to 90 seconds to complete. To make sure that the test has completed, TID 06 in mode 6 must be checked (if the test has not completed, this TID will display 0. Any other value indicates test completion). If the test did not complete, repeat the test. If the 20 thou test has not run, it is likely that the vapor concentration in the purge system is too great. In this case, drive the vehicle steadily for a further 30 minutes, avoiding excessive fuel Check for DTCs. Rectify as indicated. 40 thou and 20 thou tests using no additional equipment The test procedure and conditions are as for the Jaguar approved diagnostic system or scan tool, but no confirmation of the test having run is possible without the use of one of these instruments. The DTC will be set if the fault still exists, but the possibility exists that the conditions for the test to run may not have been met, in which case, the DTC may not be set until the owner reproduces the conditions in which the fault originally occurred. Drive cycle for "green" ECM To enable the ECM to re-learn fuelling adaptations. NOTE:
This procedure should be performed whenever the vehicle battery has been disconnected.
Due to component tolerance and wear during the normal running of a vehicle, fuelling and air requirements for an engine will vary over time. The ECM has the ability to adjust for this variation by "learning" the level of compensation that is required (these compensation values are referred to as adaptations).
If the vehicle battery is disconnected, all adaptations held within the ECM will be lost (ie, set to zero). The ECM is then referred to as "green". To enable the vehicle to function correctly, the ECM must "relearn" these adaptations.
There are five areas or sites that need to be relearnt: Allow the vehicle to idle until fully warm (temperature gauge just below mid-point). Allow to idle for a further three minutes, minimum. |