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ENGINE MANAGEMENT SYSTEM - TD5 DESCRIPTION AND OPERATION 18-1-39 With the ECM in a 'Secure' state, it will not function unless an alarm system is fitted to the vehicle. A 'Secure' ECM With the ECM in a 'No Code' state, it does not require an alarm system to be fitted to allow the engine to operate. If Setting up of the ECM immobilisation configurations can only be performed using TestBook. If a vehicle stalls immediately after starting it is possible that it has been immobilised. This means either: l The ECM was configured as 'No Code' but the ECM is receiving a code at its alarm input pin. l The ECM received an incorrect code. l The ECM was expecting a security code but did not receive one at its alarm input pin. Fuel delivery/injection control To precisely control fuel delivery and control fuel injection, the following input conditions must be met: l CKP information. l Injection timing map information. l FT information. l ECT information. The ECM monitors the conditions required for optimum combustion of fuel in the cylinder from the various sensors The ECM uses CKP information as follows: l To calculate engine speed. l To determine engine crankshaft position. Engine speed and crankshaft position allows the ECM to determine fuel injection timing. The ECM also uses ECT information and FT sensor information to allow optimum fuel delivery and injection control Turbocharger control The turbocharger wastegate modulator, via the ECM, controls boost pressure under the following conditions: l Acceleration. l Wide open throttle. l Idle. l Overrun. The turbocharger wastegate modulator receives a battery voltage supply from the main relay. The ECM supplies the |