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Category: Chevy
Satisfied Customers: 24145
Experience:  ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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Help PCM 5 Volt Reference Circuit Condition Explained The

Customer Question


PCM: 5 Volt Reference Circuit Condition Explained

The ECM has detected a fault in the 5 Volt reference voltage line

Probable Cause

Sensor using 5 volt reference line shorted to ground

Circuit short to ground


Problems on a 2002 S10 w/4.3 Motor and 4X4

ABS Light came on and stays been over heating also..
Submitted: 6 years ago.
Category: Chevy
Expert:  AMEDEE replied 6 years ago.

Have you checked the 5 volt reference circuit to see if it is really shorted out or shorted to ground?
Customer: replied 6 years ago.

Where is this 5 volt circuit? Which 5 volt Circuit? Wire colors and such?

I got your answer from the Printout I got at AutoZone.
Expert:  AMEDEE replied 6 years ago.
The PCM supplies this 5 volts on this circuit. It goes to various sensors on the vehicle. Either one of these sensors is bad shorting this circuit out, the wiring is shorted or the PCM is just simply bad.

Turn the key on and check all three wires at the tps for 5 volts. If there is no 5 volts there, you will have to check for 5 volts coming out of the computer with the key on. If still no voltage coming out of the pcm on this circuit with the key on, then chances are the PCM is at fault and will need to be replaced.
Expert:  AMEDEE replied 6 years ago.



I am just checking up on you.


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