Checking the Sensor Preheating Power Supply

Checking the Sensor Preheating Power Supply







Unplug the connector:
- Heated oxygen sensor 1 (529Fa)







- Turn the ignition switch to the ON position.







- Contact Trionic.

















- Connect test lamp 86 11 857 to B+ and pin 3 of the female connector.







- The test lamp should light.

Checking the wiring harness.
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - I

YES - Checking the Sensor Preheating Control Module Output