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ENGINE MANAGEMENT SYSTEM - V8 DESCRIPTION AND OPERATION 18-2-53 Function When the ECM is in the 'Secure' state, no further action is required as the ECM has successfully learned the BCU If the vehicle is fitted with an ECM with a valid code, the engine will start and the MIL will go out. However, if the ECM has an invalid BCU security code the engine will crank, start, and then immediately stall. The TestBook is able to retrieve the following immobilisation fault codes: Misfire detection Conditions l Flywheel reluctor adaptation. l Calculation of engine roughness. l Detection of excess emissions misfire. l Detection of catalyst damaging misfire. Function ° wide. The ECM misfire detection system uses information generated by the CKP to determine crankshaft speed and position. If a misfire occurs, there will be an instantaneous °
segment takes and is therefore able to pinpoint the source of the misfire. For the ECM misfire detection system to be calibrated for the tolerances of the reluctor tooth positions, the flywheel/ l 1800 - 3000 rev/min = speed range 1. l 3000 - 3800 rev/min = speed range 2. l 3800 - 4600 rev/min = speed range 3. l 4600 - 5400 rev/min = speed range 4. The ECM carries out flywheel/ reluctor ring adaptions across all the above speed ranges and can be monitored by l Engine at normal operating temperature. l Select second gear (for both automatic and manual transmission vehicles). l Accelerate until engine rev limiter is operational. l Release throttle smoothly to allow engine to decelerate throughout the speed ranges. l Repeat process as necessary until all adaptations are complete. P Code J2012 Description Land Rover Description P1666 Engine anti-theft signal circuit malfunction BCU serial link frame/ bit timing error P1667 Engine anti-theft signal circuit low Serial link short circuit to earth P1668 Engine anti-theft signal circuit high Serial link open circuit P1672 Engine anti-theft signal circuit wrong code Secure ECM, received incorrect code P1673 Engine anti-theft signal new engine control New ECM fitted P1674 Engine anti-theft signal No code ECM, valid code received |