MAP, MAT, TPI, CTS, and their ground

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Feb 22, 2003 | 08:20 PM

S10Wildside

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MAP, MAT, TPI, CTS, and their ground

Does the ECM ground these sensors? I just finished my MAF to MAP swap and am checking power/grounds with the ECM unplugged. The wiring diagram doesn't show a ground there, but they should be grounded. Can someone confirm that the ECM grounds these sensors? and that they don't have thier own ground.

Feb 25, 2003 | 09:33 AM

Jza

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From: Tulsa, OK

AFAIK the sensors are grounded through two sensor grounds in the ECM. So the ECM has to be plugged in or at least grounded in order for the sensors themselves to have a ground.

Feb 25, 2003 | 10:14 AM

85MikeTPI

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Re: MAP, MAT, TPI, CTS, and their ground

Quote:

Originally posted by S10Wildside
Does the ECM ground these sensors? I just finished my MAF to MAP swap and am checking power/grounds with the ECM unplugged. The wiring diagram doesn't show a ground there, but they should be grounded. Can someone confirm that the ECM grounds these sensors? and that they don't have thier own ground.

If you're referring to the '7730 ECM, my
pinout ref page

http://www.eecis.udel.edu/~davis/z28/ECMs/86to92.txt

lists the grounds for TPS, CTS, MAT as pin B5
and MAP seperately as on pin B6

mike