F0: Data List - Test Step 17 O2 Integrator Opel Senator B

Note: *

The tendency (rich or lean mixture) of the oxygen sensor control can be evaluated via the O2 INTEGRATOR.

If, for example, the air/fuel mixture is too lean (actual value > 148 STEPS) the value of the O2 INTEGRATOR is increased in steps until the oxygen sensor signals "mixture too rich". The O2 INTEGRATOR now starts to reduce its value again. This control is necessary in order to obtain an optimal reduction of the toxic substances in the catalytic converter.

Actual value 124 to 132 STEPS = nominal range

Actual value < 124 STEPS = system becomes leaner, mixture too rich

Actual value > 132 STEPS = system becomes richer, mixture too lean

In order to be able to evaluate a deviation (above or below the tolerance range) in the O2 INTEGRATOR, O2 BLOCK LEARN 1 and O2 BLOCK LEARN 2 must also be consulted. If the O2 INTEGRATOR is outside the tolerance range, monitor O2 BLOCK LEARN 1 and O2 BLOCK LEARN 2.

If O2 BLOCK LEARN 1 and O2 BLOCK LEARN 2 continue to display a steady value outside the tolerance, an evaluation of the O2 INTEGRATOR can be carried out.

* For vehicles without oxygen sensor, the O2 INTEGRATOR must display 128 STEPS!

Trouble-shooting: Nominal Value: Cause of Trouble:

Measurement value < 124 steps (system

becomes leaner, mixture too rich)

· Check fuel pump pressure Feed pressure: · Fuel pressure too high

(observe safety precautions) 2.0i: 2.5 ± 0.2 bar

3.0i: 3.0 ± 0.2 bar · Pressure regulator defective

In addition · Return line blocked or kinked

- Install manometer in Return pressure:

feed and return 2.0i: 0.3 to 1.5 bar

Engine idling 3.0i: 0.3 to 1.5 bar · Splash baffle in fuel tank blocked

· Remove vacuum hose from Feed pressure: · Vacuum hose on pressure regulator leaking

fuel pressure regulator. 2.0i: 3.1 to 3.3 bar

Close hose 3.0i: 3.6 to 3.9 bar

Further causes of trouble:

Measure pressure in system Return pressure:

as above · Tank vent valve continually open

· Leaking injection valves

· Temperature sensor defective

(see test step 02)

· Oxygen sensor defective

(see test step 16)

· Control unit defective

Measurement value > 132 steps (system

becomes richer, mixture too lean)

· Check fuel pump pressure in Feed pressure: · Fuel pressure too low

feed line 2.0i: 2.5 ± 0.2 bar

(observe safety precautions) 3.0i: 3.0 ± 0.2 bar · Fuel pump defective

In addition · Splash baffle in tank loose

- Install manometer in feed Return pressure:

and return line 2.0i: 0.3 to 1.5 bar · Fuel filter dirty

Engine idling 3.0i: 0.3 to 1.5 bar

· Dirty pre-filter

· Remove vacuum hose from Feed pressure:

fuel regulator. 2.0i: 3.1 to 3.3 bar Check feed quantity of fuel supply pump

Close hose 3.0i: 3.6 to 3.9 bar (see Technical Data)

Return pressure:

as above · Tank vent valve continually open

(for further causes of trouble see next page)

Further causes of trouble:

· Injection valve defective or dirty

· Poor fuel quality

· Intake system leaking (air leak)

· Oxygen sensor defective (see test step 16)

· Exhaust system leaking

· Control unit defective

· Temperature sensor defective (see test step 02)