Download Lotus Service Notes Section EMR

Lotus Service Notes
Section EMR
Engine Speed / Position Sensors
P0341
P0346
P0366
P0391
Camshaft Position Sensor “A” Circuit (Bank 1)
Camshaft Position Sensor “A” Circuit (Bank 2)
Camshaft Position Sensor “B” Circuit (Bank 2)
Camshaft Position Sensor “B” Circuit (Bank 2)
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 VVT control. 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 Inlet Bank 1
2 Inlet Bank 1
3 Supply voltage
1 Exhaust Bank 1
2 Exhaust Bank 1
3 Supply voltage
1 Inlet Bank 2
2 Inlet Bank 2
3 Supply voltage
1 Exhaust Bank 2
2 Exhaust Bank 2
3 Supply voltage
Description ECU Pin
Signal
A3
Ground
B3 5V
D1 Signal D4
Ground C3
5V
D1 Signal A2
Ground C2
5V
D1 Signal D3
Ground C4
5V
D1 ECU Connector
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
32 Way (Left)
Monitor:
• Continuous
Enable Criteria:
• Engine running
• Engine speed > 600rpm
• Engine runtime > 4 secs
Disable Criteria:
• None
Malfunction Criteria:
• 15 revolutions of crankshaft without receiving camshaft signal
Potential failure modes:
• Sensor signal open circuit or short to ground
• Sensor ground open circuit
• Sensor failure
• Cam failure
• Camshaft position plate
• ECU
Diagnostic Mask:
• The MIL will be illuminated if a fault is present for two consecutive trips.
Notes:
Fault code P0341 will also be generated if the vehicle fails security checks on start up.
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