LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

help....code 23 ?

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Old 03-22-2006, 05:32 PM
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help....code 23 ?

can anybody shed any light on code 23 (manifold air temp (MAT) sensor signal too low) ?

thanks in advance!
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Old 03-22-2006, 05:44 PM
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Re: help....code 23 ?

Always good to reference Shoebox's Tech Pages for the correct, LT1-specific code listing:

DTC 23 = Intake Air Temperature (IAT) sensor circuit (signal voltage high, low temperature indicated)

It sounds like the connector is off your IAT sensor, the wire is broken or the sensor is deceased. You can check for +5V at the harness wires with the connector off the sensor, then check the resistance of the sensor. At 50degF the sensor should read 5,670 ohms.
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Old 03-22-2006, 06:32 PM
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Re: help....code 23 ?

As usual....thanks for your expert knowledge Injuneer.

Robert
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