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Anti-Theft - Passive - Anti-Theft - Passive Diagnosis and Testing Principles of Operation For a detailed description of the Passive Anti-Theft System (PATS), refer to the relevant Description and Operation section Anti-Theft - Passive (419-01B Anti-Theft - Passive, Description and Operation). Inspection and Verification The best method to confirm the correct operation of the Passive Anti-Theft System (PATS) is to check the LED (located in Ignition Fails to Operate Check that the key is correctly inserted into the start control unit (SCU) and that it is the correct key for the vehicle (Key Check that the start button circuit to the Central Junction Box (CJB) is not open circuit or short to ground. Check that the CAN network is not malfunctioning, i.e. open circuit or short circuit. This would mean that the CJB, ECM and Engine Fails to Crank The immobilizer status indication LED is displayed in the bottom left of the instrument pack. W hen the key is inserted into One potential occurrence for the vehicle failing to crank on an Automatic Transmission could be due to the Locked in park Check the Crank request circuit from the CJB to ECM for short circuit or open circuit. Check the Starter Relay Circuit. Check that the Steering Column Lock (SCL) is operating correctly. Inserting the key should drive the SCL to un-lock and Check the CAN network is not malfunctioning, i.e. the CAN circuit is open or short circuit. This would mean that the CJB, Also on an Automatic, check the CAN network between the CJB and the Transmission Control Module (TCM). The CJB uses For a manual gearbox the clutch pedal has to be de-pressed, hence check the CAN network between the CJB and the ECM On an Automatic vehicle, check the CAN network between the ABS module and the CJB. The CJB uses a signal Engine Cranks But Will Not Start If the engine is cranking it means that the EMS has passed the authorisation required with the CJB. If this authorisation In all cases of suspected non-start issues, the most logical failure modes should be eliminated first. i.e. 1. Check all relevant supplies and grounds to the relevant modules are ok. Fault Codes/DTCs For the various PATS modes of operation/failures listed in the table, the CJB will store a DTC which will not be shown to When the Key is inserted and ignition status ON is achieved, if the start authorisation passes, the LED in the bottom left Starting System (303-06A Starting System - I6 3.2L Petrol, Diagnosis and Testing) / |