F0: Data List - Test Step 08 O2 Sensor Opel Vectra A

Trouble-shooting: Nominal Value: Cause of Fault:

(If nominal values are not attained)

· Separate wiring harness plug 350 to 550 mV · Lead interruption from

from oxygen sensor. control unit K 100 Ter. B 11 to wiring

With multimeter (20V/DC), harness plug at oxygen sensor.

measure voltage at · Lead interruption from

wiring harness plug control unit K 100 Ter. B 10 to ground

Ignition ON. (with display 800 to 1000 mV)

· Short circuit between K 100 Ter. B 11 and

ground.

· Control unit defective.

· Engine in TECH 1 mode "F7", · Oxygen sensor defective.

sub-mode "F0" and set to

1300 rpm with arrow keys. · Mixture constantly too lean/rich

With multimeter (20 V/DC), (See the next two pages)

measure voltage at oxygen

sensor plug (oxygen sensor 50 to 950 mV

plug disconnected)

Accelerate briefly. when accelerating briefly

> 700 mV

Trouble-shooting: Nominal Value: Cause of Fault:

(If nominal values are not attained)

Mixture constantly too rich

(oxygen sensor voltage > 600 mV)

· Check fuel pump pressure · Return lead blocked/kinked

· Leaky injection valve

Feed pressure: 0.7 to 0.8 bar (inj. valve continues dripping)

· Insulation on cable guide to

inj. valve chafes at injection housing

(loose contact to ground)

· Active carbon canister or lead to

Return pressure: < 0.3 bar injection housing leaky

· Active carbon canister valve defective

· Temperature sensor P 30 defective

(see test step 02)

· Intake manifold pressure sensor defective

(see test step 03)

Intake manifold pressure sensor hose leaky

Vehicles which are 3 years or older often have --------> · Exhaust gas recirculation valve leaky or

defective

· Throttle valve potentiometer defective

(see test step 04)

· Fuel pressure regulator defective.

If everything is OK up to here: · Check timing of valves and

· Internal exhaust gas recirculation rate too high check for leaks.

· Control unit defective

Trouble-shooting: Nominal Value: Cause of Fault:

(If nominal values are not attained)

Mixture constantly too lean

(oxygen sensor voltage < 300 mV)

· Check fuel pump pressure · Feed lead blocked/kinked

· Injection valve blocked or defective

Feed pressure: 0.7 to 0.8 bar · Connection lead from air filter

to TV housing.

Return pressure: < 0.3 bar · Active carbon canister or lead to

injection housing leaky.

· Intake manifold pressure sensor defective

(see test step 03)

Intake manifold pressure sensor hose leaky

· Temperature sensor P 30 defective

(see test step 02)

· Throttle valve potentiometer defective

(see test step 04)

· Fuel pressure regulator defective.

· Intake system leaky

· Exhaust system leaky

· Poor fuel quality

· Control unit defective