F0: Data List - Test Step 30 O2 Integrator Opel Frontera A

Note:

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

If, for example, the intake fuel/air 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 regulation is necessary to obtain an optimal reduction of the toxic substances in the catalytic converter.

Actual value 108 to 148 steps = Nominal range

Actual value < 108 steps = System gets leaner, mixture too rich

Actual value > 148 steps = System gets richer, mixture too lean

In order to be able to evaluate a deviation (above or below the tolerance range) in the O2 INTEGRATOR, the O2 BLM IDLE THR. and O2 BLM PART THR. must be consulted. If the O2 INTEGRATOR is outside the tolerance range, monitor the O2 BLM IDLE THR. and O2 BLM PART THR..

If the O2 BLM IDLE THR. and O2 BLM PART THR. continue to display a steady value outside the tolerance, an evaluation of the O2 INTEGRATOR can be carried out.

Trouble-shooting: Nominal Value: Cause of Fault:

1.6, 2.0 and 3.0 ltr. engines:

measuring value < 108 steps (system

gets leaner, mixture too rich)

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

(observe safety regulations) C 16 SEI and

2.0i: 2.5 ± 0.2 bar/36.25 ± 2.9 psi · Pressure regulator defective

3.0i: 3.0 ± 0.2 bar/43.5 ± 2.9 psi

· Return line blocked or

In addition kinked

- Install manometer in feed and Return pressure:

return C 16 SEI and

Engine at idle speed 2.0i: 0.3 to 1.5 bar/4.35 to 21.75 psi · Splash baffle in fuel tank blocked

3.0i: 0.3 to 1.5 bar/4.35 to 21.75 psi

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

fuel pressure regulator. C 16 SEI and leaky

Close hose 2.0i: 3.1 to 3.3 bar/44.95 to 47.85 psi

3.0i: 3.6 to 3.9 bar/52.20 to 56.55 psi Further causes of trouble:

Measure pressure in system Return pressure: · Fuel tank vent valve always open

as above · Leaky injection valves

· Temperature sensor defective

(s. test step 06)

· Oxygen sensor defective

(s. test step 29)

· Control unit defective

· Intake manifold valve blocked (C 30 SE)

Trouble-shooting: Nominal Value: Cause of Fault:

1.6, 2.0 and 3.0 ltr. engines:

Measuring value > 148 steps (system

gets richer, mixture too lean)

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

in feed C 16 SEI and

(observe safety regulations) 2.0i: 2.0 ± 0.2 bar/29 ± 2.9 psi · Fuel pump defective

3.0i: 2.5 ± 0.2 bar/36.25 ± 2.9 psi

· Splash baffle in tank loose

In addition

- Install or adapt manometer in Return pressure: · Fuel filter dirty

feed and return C 16 SEI and

Engine at idle speed 2.0i: 0.3 to 1.5 bar/4.35 to 17.55 psi · Dirty pre-filter

3.0i: 0.3 to 1.5 bar/4.35 to 17.55 psi

· Check fuel pump supply

· Remove vacuum hose from Feed pressure: (see Technical Data)

fuel pressure regulator. C 16 SEI and

Close hose 2.0i: 2.5 to 3.0 bar/36.25 to 43.5 psi

3.0i: 3.0 to 3.5 bar/43.5 to 50.75 psi

Return pressure:

as above

1.6, 2.0 and 3.0 ltr. engines: Further causes of trouble:

· Injection valve defective or dirty

· Poor fuel quality

· Intake system leaky (air loss)

· Oxygen sensor defective (see

test step 29)

· Exhaust system leaky

· Control unit defective

· Temperature sensor defective (see test step 06)

Trouble-shooting: Nominal Value: Cause of Fault:

2.4 ltr. engine:

Measuring value < 108 steps (system gets leaner,

mixture too rich)

· Check fuel pump pressure in feed 3.0 ± 0.2 bar/43.5 ± 2.9 psi · Fuel presure too high

(observe safety regulations) (No intake manifold · Pressure regulator defective

connection present) · Return lead blocked or kinked

In addition · Vacuum hose on pressure regulator leaky

- Slowly open connection of fuel feed · Splash baffle in fuel tank blocked

on distributor pipe, to reduce pressure

in system

- To facilitate installation of the manometer,

disconnect idle speed adjuster from intake manifold

- Connect manometer to distributor pipe

- Bleed manometer before measurement

- Start engine and allow to idle

· Pressurize pressure regulator to 0.5 bar/ 3.6 ± 0.4 bar/52.2 ± 5.8 psi · Pressure regulator defective

7.25 psi with Vacuum Pump MKM-667

Measure pressure in system Further causes of trouble:

· Fuel tank vent valve always open

· Leaky injection valves

· Temperature sensor defective (s. test step 06)

· Throttle valve potentiometer defective

(see test step 09)

· Oxygen sensor defective (see test step 20)

· Control unit defective

2.4 ltr. engine:

Measuring value > 148 steps (system gets richer,

mixture is too lean)

· Check fuel pump pressure in feed 3.0 ± 0.2 bar/43.5 ± 2.9 psi · Fuel pressure too low

(observe safety regulations)

· Fuel pump defective

In addition

- Slowly open connection of fuel feed · Splash baffle in tank loose

on distributor pipe, to reduce pressure

in system · Pressure regulator defective

- To facilitate installation of the manometer,

disconnect idle speed adjuster from intake manifold · Fuel filter dirty

- Connect manometer to distributor pipe

- Bleed manometer before measurement · Dirty pre-filter

- Start engine and allow to idle

· Check fuel pump supply

(see Technical Data)

· Pressurize pressure regulator to 0.5 bar/ 3.6 ± 0.4 bar/52.2 ± 5.8 psi · Pressure regulator defective

7.25 psi with Vacuum Pump MKM-667

Measure pressure in system

(further causes of fault on next page)

2.4 ltr. engine: Further causes of trouble:

· Injection valve defective or dirty

· Poor fuel quality

· Intake system leaky (air loss)

· Oxygen sensor defective (see test step 29)

· Exhaust system leaky

· Control unit defective

· Temperature sensor defective (see test step 06)