Digifant injection system with adjustable catalyst (engines PF, PG and 2E up to 7/92)
Prerequisite for checking: The exhaust system between the catalytic converter and the engine cylinder head must be tight.
Attention: Connect the devices only when the ignition is off.
Check the CO content and idle speed adjustment; adjust the specified parameters if necessary.
Warm up the engine until the engine oil temperature is not lower than +80°C.
Check the heating of the oxygen sensor. To do this, disconnect the plug (arrow) of the oxygen sensor and connect a voltmeter to the gray wire of the plug and ground. With the ignition on, the voltmeter should show a voltage of about 11.5 V. After this, reconnect the plug.
Connect the CO measuring device to the CO sampling tube in the engine compartment. The sampling tube is welded to the front exhaust pipe and is usually closed with a light blue cap.
Attention: Securely attach the measuring instrument hose to the sampling tube and ensure that the connection is tight.
PF, PG engines: Start the engine and let it idle for at least two minutes.
Engine 2E up to 7/92: start the engine, increase the speed to 20001 /min, then leave the engine to idle.
Read and record the reading of the CO measuring device.
PF, PG engines: Disconnect the hose from the pressure regulator at the throttle valve branch and close the connecting nipple with your thumb.
Engine 2E up to 7/92: disconnect the hose from the branching element in the line to the brake booster; for vehicles with anti-lock braking system, disconnect it together with the branching element.
The CO content should increase briefly and then decrease again. This indicates that the oxygen sensor regulation is OK and the test is complete.
If the CO content value does not decrease, disconnect the oxygen sensor connector.
Oxygen sensor wire to control unit (left contact of the plug) using an auxiliary wire, alternately connect to the ground (-) and positive pole (+) of the battery.
If the CO content now changes, replace the oxygen sensor, see chapter "Exhaust system".
Otherwise, check the electrical wires to the control unit, as well as the control unit itself (workshop work) and replace if necessary.
Connect the vacuum hose and oxygen sensor wire.
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