Vauxhall Workshop Service and Repair Manuals

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

19

O2 INTEGRATOR

Ignition ON

Engine running at idle speed, operating temperature

128            steps

90 to 170   steps

13,44,45

-

Trouble-shooting:

Nominal Value:

Cause of Fault:

(If nominal value is not attained)

The integrator can be used to evaluate the air/fuel mixture correction by the oxygen sensor control.

If, for example, the air/fuel mixture is too lean, the integrator value and thus the injection period is increased until the oxygen sensor signals that the mixture is too rich. The integrator value is then decreased and thus the injection period shortened until the oxygen sensor indicates that the mixture is too lean (closed loop).

                  Integrator = 128 means either:         Stochiometric air/fuel ratio of approx. 14.7 parts by volume air to 1 part by volume fuel, i.e. one air particle is available for the combustion of each fuel particle.

                                                              or:         The loop has been opened by the control unit because there is a fault or because the conditions for closed loop have not yet been fulfilled

                                             Note:         When in closed loop and the system is functioning faultlessly, the integrator oscillates around the value of 128, i.e. from 120 to 135 for example.

Integrator less than 128 means:       Mixture too rich, injection period is decreased

Integrator greater than 128 means:  Mixture too lean, injection period is increased.

·   To enable evaluation of a change in the integrator, the value of the O2 MSTS correction (at idle) or the O2 MSTS correction (at partial load) must also be evaluated.

·   Clear trouble code

Integrator greater than 160 and O2 MSTS correction less than 128:       wait until the system stabilizes itself (a few minutes).

Integrator greater than 160 and O2 MSTS correction greater than 150:  test step 18 part 3 mixture constantly too lean (oxygen sensor voltage less than 300 mV)

Integrator less than 100 and O2 MSTS correction greater than 128:       wait until the system stabilizes itself (a few minutes).

Integrator less than 100 and O2 MSTS correction less than 106:            test step 18 part 2 mixture constantly too rich (oxygen sensor voltage greater than 600 mV)