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LAND ROVER V8 15 DESCRIPTION AND OPERATION 18-pin black connector (C509): This connector is used primarily for ECM power and earth connections. NOTE: Voltages and other measurements given are approximations only. Actual values will ECM pin details for Connector C509: Pin No. Description Input/Output Voltage 1 Coil driver - Cylinders 5 & 8 Output 0 - 12V 2 Not used - - 3 Not used - - 4 Throttle Position Sensor Output 5V supply 5 ECM to chassis ground Ground 0V 6 Not used - - 7 Main relay supply Input 0 - 12V 8 Ignition sense Input 0 - 12V 9 ECM to chassis ground Ground 0V 10 ECM to chassis ground Ground 0V 11 Crankshaft (CKP) sensor -ve Ground 0V 12 Crankshaft (CKP) sensor +ve Analogue input 18V (average) at 480Hz 13 Coil driver - Cylinders 2 & 3 Output 0 - 12V 14 Coil driver - Cylinders 1 & 6 Output 0 - 12V 15 Coil driver - Cylinders 4 & 7 Output 0 - 12V 16 ECM to chassis ground Ground 0V 17 Main relay control Output switched to ground 18 Not used - - |