Lotus 2004 ELISE Service Notes page 155

Lotus Service Notes
Fuel Level Sensor
P0461 Fuel Level Sensor "A" Circuit Range/Performance
P0462 Fuel Level Sensor "A" Circuit Low
P0463 Fuel Level Sensor "A" Circuit High
Description
When the engine is running the ECU continuously monitors the fuel level sensor feedback signals. The feedback
signal should be low when turned ON and high when turned OFF. The following codes will be set if the above
conditions are not meet.
Sensor connections
Sensor Connector
1
2
3
Enable Criteria:
• P0462 & P0463 – Condition not met as above
• P0461 – Checks for three conditions, stuck when full, stuck when empty or stuck midway. The ECU determines
if the sensor is stuck by calculating the amount of fuel used during the test period with the engine conditions
as listed below.
• RPM > 2800rpm
• Load > 40%
• Minimum Fuel level > 2 litres (0.5 US gallons)
• If the ECU calculates that no fuel has been used during these tests it indicates that the sensor is not work-
ing correctly. The ECU also monitors the filtered and unfiltered signal at idle after a 10 second de-slosh period
and compares the differences. Gear changes cause the fuel to slosh around so the ECU monitors the signal
to see if there is any pressure rise.
Disable Criteria:
P0500 – Wheel speed sensor fault
Notes:
The MIL will be illuminated if the fault is present for 2 consecutive trips.
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P0461
P0462
P0463
Description
Vapour pressure and fuel level ground
Fuel level sensor
Vapour pressure & fuel level V ref.
Section EMP
'06 M.Y. in brackets
ECU Pin ECU Connector
78 (L4) 28 Way (Left)
76 (E3) 28 Way (Left)
55 (M4) 28 Way (Left)
03/03/2006 11:03:38