Getting DTC PO1638 "CHARGE SYSTEM FAULT" error
Thread Starter
Racer
Joined: Apr 2007
Posts: 452
Likes: 50
Getting DTC PO1638 "CHARGE SYSTEM FAULT" error
I am getting Getting DTC P1638 (Generator F-Terminal Circuit) "CHARGE SYSTEM FAULT" error...
...but only when I rev the engine high, 3500rpm or higher... Then it goes away when rpms come back down...
Any Ideas
???
...but only when I rev the engine high, 3500rpm or higher... Then it goes away when rpms come back down...
Any Ideas
???
Last edited by Pipedream; May 8, 2007 at 02:09 PM.
Safety Car
Joined: Jan 2001
Posts: 4,387
Likes: 691
From: Boise ID
Swagger #1. 
It could be a number of things. It sets the code if the PCM sees generator duty cycle less than 5% or at 100%. Could be problems with the generator, regulator, battery or PCM connections to name a few. I guess a start would be to check your battery connections and the condition of your drive belt since this happens when you rev the engine.
It could be a number of things. It sets the code if the PCM sees generator duty cycle less than 5% or at 100%. Could be problems with the generator, regulator, battery or PCM connections to name a few. I guess a start would be to check your battery connections and the condition of your drive belt since this happens when you rev the engine.
Thread Starter
Racer
Joined: Apr 2007
Posts: 452
Likes: 50
Swagger #1. It could be a number of things. It sets the code if the PCM sees generator duty cycle less than 5% or at 100%. Could be problems with the generator, regulator, battery or PCM connections to name a few. I guess a start would be to check your battery connections and the condition of your drive belt since this happens when you rev the engine.
It could be a number of things. It sets the code if the PCM sees generator duty cycle less than 5% or at 100%. Could be problems with the generator, regulator, battery or PCM connections to name a few. I guess a start would be to check your battery connections and the condition of your drive belt since this happens when you rev the engine.OK... I took the battery and alternator and had them tested... Both are working correctly, so battery, alternator/voltage regulator are off the table. I guess tomorrow I pull both connections to the PCM and see if there is any corrosion...
Any other advice would be greatly appreciated...
Safety Car
Joined: Jan 2001
Posts: 4,387
Likes: 691
From: Boise ID
The following link is a copy of the 1638 troubleshooting section right out of the manual. It may offer some clues.
http://www.gearchatter.com/viewtopic10124.php
This link is for the 1637 which can happen in conjunction with the 1638
http://www.gearchatter.com/viewtopic10125.php
http://www.gearchatter.com/viewtopic10124.php
This link is for the 1637 which can happen in conjunction with the 1638
http://www.gearchatter.com/viewtopic10125.php
Racer
Joined: Mar 2007
Posts: 337
Likes: 0
From: yorktown virginia
check your grounds, after that, since batt and alt. are good, check your belt, if it could use a replace ment, I highly recommend the goodyear gatorbacks. after that, i can only imagine it being the PCM.
Thread Starter
Racer
Joined: Apr 2007
Posts: 452
Likes: 50
The following link is a copy of the 1638 troubleshooting section right out of the manual. It may offer some clues.
http://www.gearchatter.com/viewtopic10124.php
This link is for the 1637 which can happen in conjunction with the 1638
http://www.gearchatter.com/viewtopic10125.php
http://www.gearchatter.com/viewtopic10124.php
This link is for the 1637 which can happen in conjunction with the 1638
http://www.gearchatter.com/viewtopic10125.php
Thanks to all for the replies...
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