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Lotus Service Notes
Section EMP Engine Speed / Position Sensors P0340 P0340 Camshaft Position Sensor “A” Circuit Description The camshaft position input to the ECU is used to determine engine phase, enable sequential fuel injection control and to determine camshaft position for the VVT system. The inlet camshaft has three ‘teeth’ spaced 90° apart, which are detected by the electromagnetic sensor. The valve timing setting is measured in the ECU by measuring time from a (fixed position) crankshaft tooth to a (variable position) camshaft tooth. As the engine speed and the position is known from the crankshaft sensor signal, the camshaft position can be calculated. Sensor connections Sensor Connector Description ECU Pin ECU Connector 1 Signal(VR Input) 16 (C1) 52 Way (Right) '06 M.Y. in brackets 2 Ground 42 (E2) 52 Way (Right) Monitor: Continuous Enable Criteria: • Engine running • Engine speed > 600rpm Disable Criteria: None Potential failure modes: • Sensor signal open circuit or short to ground • Sensor ground open circuit • Sensor failure Notes: • The MIL will be illuminated if the fault is present for 2 consecutive trips. • Further information on the sensor may be found in Toyota 1ZZ-FE, 2ZZ-GE manual RM733E (B120T0327J) pages DI-84 to DI-85 sn_emp_cyclone.indd 26 03/03/2006 11:03:37 |