F0: Data List - Test Step 25 O2 Integrator Opel Calibra I

Note:

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

If, for example, the intake air/fuel mixture is too lean (actual value > 133 STEPS ) the value of O2 INTEGRATOR is increased in steps until the oxygen sensor signals "mixture too rich". O2 INTEGRATOR starts to reduce its value again. This regulation is necessary to obtain an optimal reduction of the toxic substances in the catalytic converter.

Actual value 123 to 133 STEPS = nominal range

Actual value < 123 STEPS = system becomes leaner, mixture too rich

Actual value > 133 STEPS = system becomes richer, mixture too lean

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

Trouble-shooting: Nominal Value: Cause of Fault:

Measuring value < 123 steps (system becomes leaner, · Fuel pressure too high

mixture too rich) · Pressure regulator defective

· Return line blocked or kinked

· Check fuel pump pressure in feed · Vacuum hose to pressure regulator leaky

(observe safety regulations) · Splash baffle in fuel tank blocked

Connect Manometer KM-J-34730-1 to test

connection

Further Causes of Faults:

In addition

- Slowly open fuel course connection to · Tank vent valve continually open,

distributor pipe to reduce pressure in active carbon canister or line leaky

system · Leaky injection valves

- Connect manometer to distributor pipe (feed) · Temperature sensor defective (see test step 09)

- Connect second manometer to return · Idle CO switch potentiometer falsely adjusted

(use T-adapter) (only on vehicles with open loop)

- Bleed manometer before measuring · Throttle valve switch defective

- Start engine and allow to run (see test step 07)

- Remove vacuum hose from pressure regulator · Oxygen sensor defective (see test step 24)

· Control unit defective

Pressure in feed: 2.5 ± 0.2 bar

Pressure in return: 0.3 to 1.5 bar

· Install vacuum hose

Feed: Pressure must fall by 0.3

to 0.5 bar

Measuring value > 133 steps (system becomes · Fuel pressure too low

richer, mixture is too lean) · Fuel pump defective

· Splash baffle in tank loose

Pressure in feed: 2.5 ± 0.2 bar · Pressure regulator defective

Pressure in return: 0.3 to 1.5 bar · Fuel filter dirty

· Dirty pre-filter

· Install vacuum hose · Check fuel pump supply

Feed: Pressure must fall by 0.3 (see Technical Data)

to 0.5 bar

Further Causes of Faults:

· Injection valve defective or dirty

· Poor fuel quality

· Intake system leaky

· Oxygen sensor defective (see test step 24)

· Exhaust system leaky

· Control unit defective

· Temperature sensor defective

(see test step 09)