Description Of Parameters: Exhaust

FRONT OXYGEN SENSOR, SIGNAL BANK 1 

The value indicates the actual lambda at the front probe. The signal comes from the directly connected front lambda probe which is of the linear probe type.

Measurement range: 0 - 2.

Normal value: 1.

Lambda >1 = lean mix.

Lambda <1 = rich mix.

FRONT SHORT TERM FUEL TRIM, BANK 1 

The value indicates the actual compensation factor for the fast part of (fuel trim) .

Measurement range:-100 - 100%.

Normal value: 0% Error code limit ±20%.

The value is used to increase or reduce the injection time, depending on the deviation, to achieve lambda = 1.

HINT: The control module uses the fast and the slow compensation factors together, i.e. total fuel trim is the value of "Front fuel trim fast "multiplied by "Front fuel trim slow". 

FRONT LONG TERM FUEL TRIM, BANK 1 

The value indicates the actual adaptation factor for the slow part of (fuel trim) .

Measurement range: -100 - 100%.

Normal value: 0% Error code limit ±20%.

The value is used to increase or reduce the injection time, depending on the deviation, to achieve lambda = 1. There are 36 adaptation ranges. The active one depends on the actual load and speed. The value indicated is the value that applies in the relevant range.

HINT: The control module uses the fast and the slow compensation factors together, i.e. total fuel trim is the value of "Front fuel trim fast "multiplied by "Front fuel trim slow". 

REAR/CENTRE OXYGEN SENSOR, SIGNAL (V) 

The value indicates the actual voltage in the circuit to the rear/middle oxygen sensor, which are binary probe types.

HINT: In vehicles with two probes, this value corresponds to the signal from the rear probe. In vehicles with three probes, this value corresponds to the signal from the middle probe. 

Measurement range: 0 - 5 V.

Normal value: 0.5 - 0.7 V, which approximately corresponds to lambda = 1.

REAR OXYGEN SENSOR, SIGNAL (3 PROBE VERSION) (V) 

The value indicates the actual voltage in the circuit to the rear oxygen sensor, which are binary probe types.

HINT: This value only applies to vehicles with three probes. For vehicles with two probes, "Rear/middle oxygen sensor, signal" must be used instead. 

Measurement range: 0 - 5 V.

Normal value: 0.5 - 0.7 V, which approximately corresponds to lambda = 1.

REAR/MIDDLE OXYGEN SENSOR, HEATING (Ω) 

The value indicates the actual resistance in the circuit to the heater for the rear/middle oxygen sensors.

HINT: In vehicles with two probes, this value corresponds to the resistance in the circuit to the rear probe. In vehicles with three probes, this value corresponds to the resistance in the circuit to the middle probe. 

Measurement range: 0 - 100 000 Ω.

Normal value: After initial heating at maximum power (>800 Ω) during a cold start heating transfers after a minute (or minutes) to maintenance heating, corresponds to 50 - 150 Ω in the circuit.

HINT: During a cold start heating starts after a few seconds. This is to first reach the dewpoint with heating only from the exhaust gases. 

REAR OXYGEN SENSOR, HEATING (3 PROBE VERSION) (Ω) 

The value indicates the actual resistance in the circuit to the heater for the rear oxygen sensors.

HINT: This value only applies to vehicles with three probes. For vehicles with two probes, "Rear/middle oxygen sensor, heating" must be used instead. 

Measurement range: 0 - 100 000 Ω.

Normal value: After initial heating at maximum power (>800 Ω) during a cold start heating transfers after a minute (or minutes) to maintenance heating, corresponds to 50 - 150 Ω in the circuit.

HINT: During a cold start heating starts after a few seconds. This is to first reach the dewpoint with heating only from the exhaust gases.