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Gary, ASE Certified Technician
Category: Chevy
Satisfied Customers: 999
Experience:  Senior Technician
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Crank sensor output signal is 10 volts all the time when

Customer Question

crank sensor output signal is 10 volts all the time when igniton is on have 12 volt supply and good groumd to sensor sensor wires are not shorted to each other, replaced crank sensor 3 times, replaced plug to sensor,
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: no
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: crank sensor
JA: Anything else you think the mechanic should know?
Customer: no
Submitted: 11 months ago.
Category: Chevy
Expert:  Gary replied 11 months ago.

Hi there,

I'm not sure what you trying to achieve in your question.

The sensor voltage would go from about 10v to about 2.5v for each signal.

It works in a range like this because if the signal wire is shorted to ground or voltage, it will log an appropriate DTC.

Can you tell me about your troubles?


Customer: replied 11 months ago.
Have checked wires in crank sensor circuit, correct voltage, and ground, wires not open or shorted. New crank sensor will enable engine to operate properly for two three minutes. Then it stops and the crank sensor is not pulses. Signal out of crank sensor is 10-12 volt continuous. Has happened with 3 new crank sensors
Expert:  Gary replied 11 months ago.

Hi again,

What vehicle and engine?


Expert:  Gary replied 11 months ago.

Hi again,

If you believe the wiring is ok, then 3 crank sensors to me says the ECM is the likely cause.

Kind regards