Lotus Evora - Engine Speed; Position Sensors

Lotus Service Notes Section EMR
Page 37
Engine Speed / Position Sensors
P0335 Crankshaft Position Sensor “A” Circuit Range/Performance
Description
Engine speed is calculated by measuring the time between the ‘teeth’ of the crankshaft sensor trigger disc. The
disc has 34 ‘teeth’ and 2 missing ‘teeth’, spaced at 10 degree intervals around the disc. The 2 missing ‘teeth’
are positioned at 225 degrees before cylinder No.1 and 4 TDC. The crankshaft sensor signal is also used to
determine misfires events.
Sensor connections
Sensor Connector Description ECU Pin ECU Connector
1 Sensor input A4 32 Way (Left)
2 Ground B2 32 Way (Left)
Monitor:
• Continuous
Enable Criteria:
• Enginerunning
Disable Criteria:
• None
Malfunction Criteria:
• 15crankerrorsinsuccession.Thiscanoccurduetonocranksignaloccurringwhilstthecamscontinueto
count or if there is a measured consecutive crank error.
Potential failure modes:
• Sensorsignalopencircuitorshorttoground
• Sensorgroundopencircuit
• Sensorfailure
• Crankshaftsensorplate
• ECU
Diagnostic Mask:
• TheMILwillbeilluminatedifthisfaultispresentfortwoconsecutivetrips.
Notes:
If a sensor or sensor circuit failure occurs, the engine will not fire or start.
2009/02