2003 - 2004 Chevy Truck Tach

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Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=25871
Printed Date: May 03, 2024 at 8:44 AM

Topic: 2003 - 2004 Chevy Truck Tach

Posted By: kwalton
Subject: 2003 - 2004 Chevy Truck Tach
Date Posted: February 04, 2004 at 10:17 PM

Does anyone out there have better if than DEI for the tach wre location in a 2003 - 2004 chevrolet express van??

Replies:

Posted By: atcodoctor
Date Posted: February 04, 2004 at 10:54 PM

What size engine are you working with.

This is a 4.3 lit. PCM plug is Blue. This is off of the crankshaft sensor. Pin 12 Yellow wire circuit 573.

I cannot find any RPM wire at the PCM on the 4.3 - 4.8 - 5.4 - 6.0 for 2003 or 2004

The Crankshaft sensor or the Camshaft sensor should provide the required signal, it is not the cleanest signal.

(or connecting to one of the coils)

573

CKP Sensor Signal

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TheDoctor

Posted By: HamiltonAudio
Date Posted: February 05, 2004 at 8:12 AM

why make life difficult? the fuel injectors are very easily accessible, and provide a solid signal. we've found Autostart will not work right UNLESS we use the injector. if I remember correctly on the V8 models its /not/ the pink wire...

Posted By: HamiltonAudio
Date Posted: February 05, 2004 at 8:13 AM

Posted By: atcodoctor
Date Posted: February 05, 2004 at 6:31 PM

Connecting to fuel injector is OK but watch out, pink is 12 volt power, the PCM controls the ground side of the injector and the pulse width for fuel control. Hopefully you do not get a check engine lite indicating a injector control circuit problem. If it works run with it.

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TheDoctor

Posted By: HamiltonAudio
Date Posted: February 06, 2004 at 11:02 AM

hey doc....good stuff. although, please note in my above post I clearly put /not/ pink posted_image we've found this is the only really reliable tach in these trucks for Autostart products. have done MANY this season and never had an issue with the SES light...