Newbie-esque question here

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Nov 5, 2013 | 04:02 PM

KYWes

Thread Starter

Registered User

Joined: Mar 2003

Posts: 449

From: Louisville, KY

Newbie-esque question here

As in my sig I've got a 1995 Z28.

As I understand, there are two coolant temperature sensors. One for the computer and one for the guage.

My question is which one does what? I have a sensor mounted at the water pump and I have a sensor mounted on the left side engine block.

Also, the sensor at the water pump had two leads and the one on the side of the block has one lead. Is this right?

Thought I'd throw you guys an easy one. Thanks for the help.

Nov 5, 2013 | 04:33 PM

Injuneer

Administrator

Joined: Nov 1998

Posts: 71,094

From: Hell was full so they sent me to NJ

Re: Newbie-esque question here

The 2-wire coolant temp sensor mounted in the water pump housing feeds the PCM. The 1-wire coolant temp sensor in the drivers side head (not block) feeds the dash gauge.

Yes. The PCM provides 5V reference on the two wires to the water pump sensor. The ground for the head sensor is the block itself, and the wire provides 12V.

Courtesy of Shoebox:

http://shbox.com/1/temp_sensor1.jpg

http://shbox.com/1/temp_sensor2.jpg