F0:Data List - Test Step 38 02 Integrator Opel Calibra I

F0:DATA LIST

38

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Note:

The air/fuel mixture correction of the oxygen sensor regulation can be evaluated using the O2 INTEGRATOR.

If, for example, the air/fuel mixture is too lean, the O2 INTEGRATOR value and thus the injection period is increased in steps until the oxygen sensor signals that the mixture is too rich.

The O2 INTEGRATOR is then decreased again in steps and thus the injection period shortened until the oxygen sensor indicates that the mixture is too lean (closed loop only).

by volume fuel; i.e. for the combustion of each fuel particle, there is one air particle available.

or the conditions for closed loop have not yet been attained.

The O2 INTEGRATOR affects the injection period and thus also the amount of fuel injected. As the amount of fuel depends on the fuel pressure, incorrect fuel pressure can be detected as follows:

In order to evaluate a deviation of the O2 INTEGRATOR value, the values of the O2 BLM IDLE THR. correction and 02 BLM PART THR. correction must also be evaluated.

Possible interrelationships if nominal values are not attained:

· O2 INTEGRATOR less than 102 and O2 BLM IDLE THR. less than 100:

System becomes leaner, mixture too rich.

· O2 INTEGRATOR less than 102 and O2 BLM PART THR. less than 105:

System becomes leaner, mixture too rich.

· O2 INTEGRATOR greater than 154 and O2 BLM IDLE THR. greater than 140:

System becomes richer, mixture too lean.

· O2 INTEGRATOR greater than 154 and O2 BLM PART THR. greater than 135:

System becomes richer, mixture too lean.

Notes on Trouble-shooting:

Measured value less than 102 steps (mixture too rich, system becomes leaner):

· Check fuel pump pressure

(observe safety measures)

· Install pressure gauge in feed and return lines

· Pressure regulator defective

· Return line blocked or kinked

· Baffle plate in fuel tank blocked

· Disconnect vacuum hose from

fuel pressure regulator

Feed pressure:

3.0 to 3.5 bar

Return pressure:

· Vacuum hose at pressure regulator leaky

Controlled canister purge valve constantly open

(activated carbon canister full)

· Injectors leaky

· Temperature sensor P 12 defective

(see test step 06)

· Oxygen sensor P 32 defective

(see test step 36/37)

· Control unit K 61 defective

Measured value greater than 154 steps (mixture too lean, system becomes richer):

· Check fuel pump pressure

(observe safety measures)

· Engine running at idle speed

C 20 XE: 2.2 to 2.7 bar

C 25 XE: 3.0 to 3.5 bar

· Fuel pressure too low

· Fuel pump defective

· Baffle plate in tank loose

· Fuel filter dirty

· Prefilter dirty

3.0 to 3.5 bar

Return pressure:

· Check fuel pump supply quantity

(see Technical Data)

· Injector defective or dirty

· Poor fuel quality

· Exhaust system leaky (in front of oxygen sensor)

· Intake system leaky (air leak)

· Controlled canister purge valve constantly open (activated carbon canister empty)

· Vapour lock in fuel feed or return line

· Coolant temperature sensor defective

· Oxygen sensor defective

· Control unit K 61 defective