Lotus 2004 ELISE Service Notes page 172

Lotus Service Notes
Crankshaft Position–Camshaft Position Correlation Error
Description
The crankshaft position sensor is used to identify engine position and speed via a pole wheel mounted on the
front end of the crankshaft. The camshaft position sensor is used to determine camshaft position from a three
vane reluctor on the rear end of the inlet camshaft. The Variable Valve Timing system (VVT) on the inlet cam-
shaft can vary the timing by up to 25°, with fault codes P0011 and P0012 allocated to errors with the variable
timing. Fault code P0016 indicates a mechanical timing error such as incorrectly set, or 'jumped' cam timing.
Enable Criteria:
# Engine running (for up to 4 seconds)
Disable Criteria: None
Potential failure modes:
# Crankshaft/Camshaft alignment
Throttle Position Sensor 'B' Circuit Low
Description
Two potentiometers are built into the throttle valve actuator unit in order to provide a throttle position signal to
the ECU. Note that the sensors operate on 5 volts.
Enable Criteria: None
Disable Criteria: None
Potential failure modes:
# Signal short circuit (< 0.283 V)
# Reference voltage open circuit
# Reference voltage short to ground
# Sensor failure
Notes: A maximum throttle opening of 15% may be imposed due to this single code. In the case of multiple
codes, a mechanically sprung 7% opening may be applied.
Throttle Position Sensor 'B' Circuit High
Enable Criteria: None
Disable Criteria: None
Potential failure modes:
# Signal open circuit (> 4.487 V)
# Reference voltage open circuit
# Reference voltage short to ground
# Sensor failure
Notes: A maximum throttle opening of 15% may be imposed due to this single code. In the case of multiple
codes, a mechanically sprung 7% opening may be applied.
sn_emp_cyclone.indd 49
Section EMP
P0016
P0222
P0223
Page 49
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