2002 Trailblazer TAC fuse blowing. - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 07-31-2019, 03:13 PM
Scott Harpster Scott Harpster is offline
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2002 Chevy TrailBlazer LS
Dark Green Metallic 4.2L I6 2WD
Join Date: Jul 2016
Location: North Little Rock, AR
Posts: 6
2002 Trailblazer TAC fuse blowing.

My 2002 Trailblazer TAC (sometimes labeled ETC) fuse keeps blowing (fuse #23, 10 amp), causing a P1512 code. I recently replaced the Throttle Body and Accelerator Pedal for P1515 and P1516 codes. Those codes have cleared, but this new problem has surfaced. Sorry if this has been covered previously, but I couldn't find anything on this. I'm thinking wiring problem, but I have no schematics to chase that down. Any thoughts or ideas?
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  #2  
Old 07-31-2019, 04:35 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
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This fuse supplies +12VDC (hot on RUN) directly to the PCM connector C3 pin 17. It is called IGN 1 Voltage. You may have a wiring problem, a bad fuse panel or a bad PCM. Further troubleshooting is required. Attached is a schematic page.
Attached Files
File Type: pdf Page 31 from 2002 WIRING.pdf‎ (134.4 KB, 13 views)
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  #3  
Old 07-31-2019, 04:57 PM
Scott Harpster Scott Harpster is offline
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2002 Chevy TrailBlazer LS
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Which of the three connectors is C3? I keep getting conflicting descriptions.
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  #4  
Old 07-31-2019, 06:39 PM
Scott Harpster Scott Harpster is offline
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2002 Chevy TrailBlazer LS
Dark Green Metallic 4.2L I6 2WD
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Location: North Little Rock, AR
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Thanks EB2004. I figured out which connector it is. The wiring from the fusebox to the PCM connector is good, so I'll have to dig further. I sure hope it's not the PCM.
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Old 08-01-2019, 09:37 PM
Scott Harpster Scott Harpster is offline
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2002 Chevy TrailBlazer LS
Dark Green Metallic 4.2L I6 2WD
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Location: North Little Rock, AR
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Checked all the wiring in TAC system. No grounds, no opens. Therefore, I believe the PCM is the culprit. I am ordering a preprogrammed one for my VIN number.
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Old 08-07-2019, 01:26 PM
Scott Harpster Scott Harpster is offline
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2002 Chevy TrailBlazer LS
Dark Green Metallic 4.2L I6 2WD
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Location: North Little Rock, AR
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Update! The TAC/ETC fuse is not blowing anymore, Seems to be corrected by Removing and replacing PCM C3 connector (took off the connector and put it back on). All wiring and grounds were double checked, 5V Ref 1 and 5V Ref 2 voltages verified, Low Ref Ground verified. APP and TPS sensors resistance measured. No problems found, but still P1512 code. New PCM will be here tomorrow. Fingers crossed...
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  #7  
Old 08-13-2019, 02:56 PM
Scott Harpster Scott Harpster is offline
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2002 Chevy TrailBlazer LS
Dark Green Metallic 4.2L I6 2WD
Join Date: Jul 2016
Location: North Little Rock, AR
Posts: 6
Solved

The new PCM did not rectify the problem. So I went to Pick n' Pull and got a fuse box. Long story short, no more P1512, or any other codes. It appears that the fuse box was the culprit. Whoda thunk... Now I need to drive as soon as the battery charges!
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