Lotus Evora. Manual - part 30

 

 

Lotus Service Notes   

 

 

  Section EMR

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    Description                    ECU Pin    ECU Connector

1             

2              Fuel level sensor                      A2       48 Way (Right) 

3              Fuel level sensor ground.                    K3             48 Way (Right)

P0462, P0463

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine Running

Disable Criteria: 

•  None

Malfunction Criteria: 

•  P0462 – Voltage < 0.020V, P0463 – Voltage > 0.684V for 1.5 secs

Potential failure modes:

•  Sensor open or short circuit

•  Fuel level sensor

Diagnostic Mask:

•  The MIL will be illuminated if these faults are present for 2 consecutive trips.

P0461

The ECU calculates the fuel usage and determines whether the fuel level sensor has responded correctly to 

this usage. The ECU also monitors the filtered and unfiltered signal at idle after a 20 second de-slosh period 

and compares the differences. 

Monitor: 

•  Continuous

Enable Criteria 1:

•  Vehicle Idling

•  Vehicle stationary for 20 seconds

Disable Criteria 1:

•  Fuel level < 3.3 litres (0.9 US gallons)

Malfunction Criteria 1: 

•  Signal fluctuation > 10 litres, 35 times over 7 second period

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Enable Criteria 2:

•  12 litres fuel usage in upper region

•  10 litres fuel usage in lower region

•  5 litres fuel usage in mid region

Disable Criteria:

•  Vehicle stopped for 30 secs

Malfunction Criteria:

•  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.  If the fuel level does not move by 

more than 1 litre a fault is flagged.

Potential failure modes:

•  Fuel level sensor wiring or connector corroded

•  Fuel level sensor stuck

Diagnostic Mask:

•  The MIL will be illuminated if these faults are present for 2 consecutive trips.

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Engine Cooling Fan Control

P0480  Fan 1 Control Circuit

P0481  Fan 2 Control Circuit

Component connections

Sensor Connector    Description    ECU Pin    ECU Connector

                 Fan Relay 3       F1      48 Way (Right)     

                 Fan Relay 2       E2      48 Way (Right)

Monitor: 

•  Continuous

Enable Criteria: 

•  Engine running

Disable Criteria: 

•  None

Potential failure modes:

•  Wiring harness problem

•  Relay

•  ECU

Diagnostic Mask:

•  The service light will be illuminated for 30 seconds after engine start if the fault has been present for the

previous two trips.

 

2009/02

 

 

Lotus Service Notes   

 

 

  Section EMR

Vehicle Speed Sensor

                                                           

P0500  Vehicle Speed Sensor “A”

Description

This input to the ECU is from the ABS module via CAN.

Monitor: 

•  Continuous

Enable Criteria:

•  Following conditions must occur for 5 seconds

•  Engine speed > 1800rpm and < 5010rpm

•  Baro > 756 mbar

•  Engine in a mode that indicates that the vehicle must be moving.

Malfunction Criteria: 

•  KMH < 5 kmh

Potential failure modes:

•  ABS module failure

•  CAN bus communication error to ABS controller

Diagnostic Mask:

•  The MIL will be illuminated if a fault is present for two consecutive trips.

 

2009/02