Test Point 8 - Oxygen Sensor Signal
TEST POINT 8: - Oxygen sensor(V) (Sensor signal) - Fault code 1_24Possible Causes, Elimination, Remarks
Sensor signal test
Using the system tester 9288, the sensor voltage can be read directly in the "Actual value" menu.
If not: Disconnect the oxygen sensor plug. Connect a digital voltmeter with the test connection (voltage signal air sensor) and ground at the sensor end.
Start the engine and allow to warm up so that the oxygen sensor reaches its operating temperature. When the mixture is enriched, e.g. acceleration, a change in the voltage signal must be displayed.
Voltmeter display: approx. 150 mV - 900 mV (depending on mixture composition).
NOTE: If the control unit detects an oxygen sensor voltage signal of more than 1 V or less than 0.1 V, the control unit will switch over to operation without oxygen sensor (short-circuit or break).
If the regulator is not functioning and the sensor voltage signal is O.K., check the coding of the control unit before replacing it.