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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 08-26-2009, 05:46 PM
etoh100 etoh100 is offline
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2005 Chevy TrailBlazer LS EXT
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No Power at OBD port

SES light has been coming on intermittently, but not staying on consistently. Guy at AutoZone plugged in reader and said there was no power to port. Any idea which fuse to check first? Cigarette lighters all have power. Was told they might both be on same circuit. Any info would be greatly appreciated.

Also, just went through 2 water pumps within a month. Could there be something else making the bearings in pump go bad pre-maturely?

Bob
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  #2  
Old 08-26-2009, 06:08 PM
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the roadie the roadie is offline
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It's fused by the CIGAR fuse #13 under the hood. Must have broken off the back of the OBDII connector if your accy outlets are all OK. Unscrew it from the trim panel and look.

Water pump bearings? Hmmmm, unbalanced fan - unbalanced fan clutch - incorrect (too short) length serpentine belt, replacement water pump made in East Roosterpoot, Banana Republic instead of at a reputable and traceable vendor? How long did the first one last? Are you saying you went through TWO replacements in a month, or the time between the failure of the original to the failure of the replacement was a month? You might have just had one dog of a replacement instead of a vehicle problem.
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  #3  
Old 08-26-2009, 06:16 PM
etoh100 etoh100 is offline
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will try to unscrew OBD port and check.

Only had original water pump replaced and 1 new one within last month. So, the replacement didn't last very long. Wifee starting to hear same noise she heard last time before serp. belt shredded, and left her stranded, but only intermittently now. Said it sounds like a jet engine revving-up. Any easy way to check fan balance, clutch, etc?
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  #4  
Old 08-27-2009, 12:10 PM
etoh100 etoh100 is offline
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Ok, all 4 wires connected to back of OBD port and #13 fuse ok. Any other ideas why no power to OBD port? I have a Hypertech Power Programmer III for my '99 Blazer; could I use it just to test to see if there's power to the port or not? Any other way to see if there's power at the port without hooking up a reader? I have a multimeter. Thanks for the help.
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  #5  
Old 08-27-2009, 12:12 PM
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Quote:
Originally Posted by etoh100 View Post
Ok, all 4 wires connected to back of OBD port and #13 fuse ok. Any other ideas why no power to OBD port? I have a Hypertech Power Programmer III for my '99 Blazer; could I use it just to test to see if there's power to the port or not? Any other way to see if there's power at the port without hooking up a reader? I have a multimeter. Thanks for the help.
Sure. Whip out the meter and check the POWER and GROUND pins. Use Google to find out the pin definitions of the port.

http://en.wikipedia.org/wiki/On-board_diagnostics
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  #6  
Old 08-27-2009, 01:07 PM
etoh100 etoh100 is offline
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Got power at the OBD port now. Guess I just gotta get it to somebody to pull the codes. Thanks for the help.
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  #7  
Old 08-27-2009, 01:11 PM
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MAY03LT MAY03LT is offline
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What was the problem?
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  #8  
Old 08-27-2009, 01:21 PM
etoh100 etoh100 is offline
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Don't know. Didn't do anything but unscrew port, check wires and put on multimeter. Maybe guy at Autozone had a bad scanner or just didn't feel like helping me. Anyhow, I just called my mechanic to see if he could pull the codes today for me and he said when he replaced last water pump, he heard a noise that sounded like a cracked manifold when engine was cold/warming up. Said it went away when engine got warm probably sealing/closing itself once hot. So, any idea what it's gonna cost to replace exhaust manifold? Any cheap fixes? Any kind of performance manifold I could have installed while I'm getting it done? Should the O2 sensors be replaced? I guess I'm assuming the SES light might be due to the manifold crack.

Geez, one thing after another.
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  #9  
Old 08-27-2009, 06:48 PM
WOOLUF1952 WOOLUF1952 is offline
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Check here:http://forums.trailvoy.com/showthread.php?t=61868
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  #10  
Old 08-27-2009, 07:53 PM
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LMMJ LMMJ is offline
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dang, beat me to it.
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