Lotus Elise / Lotus Exige. Instruction - part 35

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Lotus Service Notes   

 

 

  Section EMP

Coolant Thermostat              P0128

P0128  Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Description

The thermostat diagnostic is enabled after each cold engine start, and monitors the rate of temperature rise 

during warm up relative to the measured engine air flow.

Monitor: Continuous

Enable Criteria:

•  Engine running

•  Coolant Temperature > -10°C (14°F)

•  Coolant Temperature < 70°C (158°F)

Disable Criteria: 

P116, P117, P118 – Engine Coolant Temperature sensor faults

Potential failure modes:

Thermostat failure

Notes:

The MIL will be illuminated if the fault is present for 2 consecutive trips.

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Lotus Service Notes   

 

 

  Section EMP

Page 15

O2 Sensor (Pre Catalyst)          P0131

                          P0132

                          P0133

                          P0134

                          P0135

P0131  O2 Sensor 1 Circuit Low Voltage

P0132  O2 Sensor 1 Circuit High Voltage

P0133  O2 Sensor 1 Circuit Slow Response

P0134  O2 Sensor 1 Circuit No Activity Detected

P0135  O2 Sensor 1 Heater Circuit

Description

The oxygen sensor monitors the oxygen content in the exhaust gases. The sensor consists of a zirconia elec-

trode between two platinum plates. When zirconia comes into contact with oxygen, it becomes an electrical 

conductor. The exhaust gases pass through louvers in the sensor. One plate is in contact with the outside air 

and the other plate is in contact with the exhaust gases. The platinum plate in contact with the air is electrically 

negative due to the oxygen in the atmosphere and the plate in contact with the exhaust gases is electrically 

positive. This will cause a difference in electrical potential to develop between the two plates. Thus the voltage 

across the platinum plates ranges approximately from 100 millivolts to 900 millivolts, depending on the oxygen 

content of the exhaust gases. Thus when the air/fuel mixture is rich, the oxygen sensor output will be high. If 

the air/fuel mixture is lean, the oxygen sensor output will be low.

Sensor connections

Sensor Connector    Description      ECU Pin      ECU Connector

1              Signal         15 (A3)      52 Way (Left)

2              Ground        41 (F4)      52 Way (Left)     

'06 M.Y. in brackets

3              Heater         1 (K3)       52 Way (Left)

4              Battery Voltage   -          -

Sensor characteristics

Normal operating range is 0 – 1000mV

Malfunction Criteria

P0131 

Set when the sensor operates below 5mV for more than 1.5 seconds consecutively for a specified number of 

times.

Monitor: Continuous

Disable Criteria: DFCO (Deceleration Fuel Cut Off)

Potential failure modes:

•  Low fuel pressure (Lean mixture)

•  Malfunctioning sensor

•  External water on sensor

•  Sensor wire shorted to ground

P0132

Set when the sensor operates above 1200mV for more than 1.5 seconds consecutively for a specified number 

of times.

Monitor: Continuous

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  Section EMP

Potential failure modes:

•  High fuel pressure (Rich mixture)

•  Leaking or shorted injector

•  Purge valve fault

•  Oxygen sensor contamination

•  Engine oil contamination

•  Sensor wire

P0133 

Set when the sensor fails to switch from a Lean to a Rich condition or switch from a Rich to a Lean condition 

in a sufficiently timely manner.  A selection of switches is used to determine the average times.

Enable Criteria:

•  Vehicle speed between 0 – 255 km/h (158.5 mph)

•  MAF per stroke between 15 – 70 mg

•  Engine speed between 2600 – 3511rpm

•  Engine run time > 200 seconds

•  Coolant temperature > 60°C (140°F)

•  Closed loop fuelling enabled

Disable Criteria:

P0116, P0117, P0118        – Coolant temperature sensor faults

P0131, P0132, P0134, P0135  – Pre catalyst oxygen sensor faults

P0101, P0102, P0103       – MAF sensor faults

Monitor:

Monitored until the required amount of switches in both directions has been achieved (Approx. 150 sec)

Potential failure modes:

•  Sensor connector and wiring should be checked for corrosion and loose connections

•  Sensor contaminated, possibly from fuel, improper use of RTV, engine oil or coolant

P0134 

Set when the sensor fails to switch above 557mV ('06 M.Y.; 675mV) and below 400mV within a 5.1 second 

period for 5 consecutive checks ('06 M.Y.; within 60 sec).

Enable Criteria:

•  Engine run time > 30 seconds

•  Engine is not at idle

•  Engine is in closed loop fuel control

Monitor:

Until either passed or failed (5.1 x 5 = 25.5 sec + initial 30 sec = 55 sec maximum).

Potential failure modes:

Sensor connector and wiring should be checked for corrosion and loose connections.

P0135 

Set when the sensor output is greater than 1900mA or less than 250mA for 1.5 seconds, for 40 consecutive 

checks.

Enable Criteria:

Engine run time > 60 seconds

Monitor:

Continuous

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  Section EMP

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Potential failure modes:

Sensor connector and wiring should be checked for corrosion and loose connections.

Notes:

•  The MIL will be illuminated if the fault is present for 2 consecutive trips.

•  Further information on the sensor may be found inToyota 1ZZ-FE, 2ZZ-GE instruction RM733E (B120T0327J) 

pages DI-53 to DI-62

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