Lotus 2004 ELISE Service Notes page 149

Lotus Service Notes
Engine Speed / Position Sensors
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
1
2
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
Page 26
sn_emp_cyclone.indd 26
Description ECU Pin
Signal(VR Input) 16 (C1)
Ground 42 (E2)
P0340
ECU Connector
52 Way (Right)
52 Way (Right)
Section EMP
'06 M.Y. in brackets
03/03/2006 11:03:37