Two crankshaft sensors can perform the same job while using different electrical principles. Choosing a test from the connector shape or wire count alone can send the investigation in the wrong direction.

What to check next

Identify the actual sensor type and circuit before testing. For an active device, supply and reference integrity matter; for a passive device, the generated signal and installation need the appropriate assessment. Compare the signal at the sensor and at the ECU if the wiring is suspect.

Useful information for an enquiry

Provide the engine code, sensor part number and wiring information where available.

Do not apply resistance tests indiscriminately to an unidentified electronic sensor. Test limits and methods must come from the correct component information.

Speak to AXION

For complex vehicle-electronics diagnostics, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from HELLA. The referenced design explains the principle; the vehicle-specific procedure determines the repair.