Question about 2003 Toyota ECHO

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Toyota Echo 2002 A.C. and Serp Belt

I had a squeel for a while from the A.C. It sometimes stopped when I turned off the A.C. but with time the squeel persisted and finally the Serp Belt broke bad.
Luckily, while on the road, I found a repair shop within a mile of where the belt broke.  He examined the belt and suspected a bad a.c. 
The wheel spun OK so he put on a new belt. He pointed out to his Kid helper an connector down below where he was working, and instructed him to disconnect  it. The Connector was down along side the V belt housing.
After I pulled away from the shop, the Check Engine came on and it idled very high continuously. The Engine Light did not go off after 50 miles, and it continued to idle very high and was rough.
I'm wondering if the Kid disconnected the wrong connector (there's another one inches away down below).
I'm wondering if I should plug it back in and just pull the A.C. fuse or something???? Any Help appreciated

Posted by on

  • Echo Guy Sep 26, 2008

    Thanks for your help.   I'm wondering why the Check Engibe light is still on, and it idles high, or variably idles???

  • Echo Guy Sep 29, 2008

    Hi Toyota Ed

    It's a P300 code, which I guess is a misfire. Now what???




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  • 1,861 Answers

Plug the connector back in & pull the AC fuse. You probably have the beginnings of a "locked up" compressor. The pulley will turn if the engine and the AC is off. When the compresser clutch is engaged, and the compressor is locking up, it will overheat & snap the serp belt.

Posted on Sep 26, 2008

  • Toyota Ed Sep 26, 2008

    Without knowing which sensor was actually unplugged, it would be difficult to speculate, but, with the system that you have, the computer "remembers" faults, and this would def be a case that the ECU would "store" in its memory, as sensor unplugged tells the ECU that there is an "open" in that circuit.... Best thing to do is go & get the vehicle hooked up to a scan-tool and record the DTC(s) found, and please get that info back to me.

  • Toyota Ed Sep 29, 2008

    P-0300 has nothing to do with the AC compresser. May be time for plugs, or you may have gotton some bad fuel.



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