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code 34 by EvilSqueezles
Started on: 07-29-2013 04:45 PM
Replies: 5 (260 views)
Last post by: phonedawgz on 07-30-2013 10:16 PM
EvilSqueezles
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Report this Post07-29-2013 04:45 PM Click Here to See the Profile for EvilSqueezlesClick Here to Email EvilSqueezlesSend a Private Message to EvilSqueezlesEdit/Delete MessageReply w/QuoteDirect Link to This Post
I know code 34 is MAP low voltage, and i have put my meter on it. Voltage across C and A ( +5v and ground ) is reading right at 5 and holding steady. My meter for some reason won't show me resistance there.

On my MAP I put my meter in across the same two pins and got 1368 Ohms. Does that seem low? Or can I assume my MAP is toast?

87 GT 2.8 auto BTW.

[This message has been edited by EvilSqueezles (edited 07-29-2013).]

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EvilSqueezles
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Report this Post07-29-2013 06:22 PM Click Here to See the Profile for EvilSqueezlesClick Here to Email EvilSqueezlesSend a Private Message to EvilSqueezlesEdit/Delete MessageReply w/QuoteDirect Link to This Post
Also of note. The car smells as if it runs rich and when I unplug the MAP it dies completely.
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EvilSqueezles
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Report this Post07-30-2013 04:38 PM Click Here to See the Profile for EvilSqueezlesClick Here to Email EvilSqueezlesSend a Private Message to EvilSqueezlesEdit/Delete MessageReply w/QuoteDirect Link to This Post
Anyone have an idea?

~James
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Midn1ght Driv3r
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Report this Post07-30-2013 07:30 PM Click Here to See the Profile for Midn1ght Driv3rClick Here to Email Midn1ght Driv3rSend a Private Message to Midn1ght Driv3rEdit/Delete MessageReply w/QuoteDirect Link to This Post
From what I've read with map problems:

Have you tried unplugging it and THEN starting the car? The ECU then creates it's own numbers that would be would be in at least a run-able state?

Do you have any vacuum leaks? If the map isn't getting enough vacuum, it can cause low voltage if I remember correctly
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EvilSqueezles
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Report this Post07-30-2013 09:17 PM Click Here to See the Profile for EvilSqueezlesClick Here to Email EvilSqueezlesSend a Private Message to EvilSqueezlesEdit/Delete MessageReply w/QuoteDirect Link to This Post
From what I've read, a common vacuum leak shouldn't cause low voltage reading. Would take something rather large, and with the car cold idling at 1500, I doubt that's my problem. I do however need to unplug and then start it and see if that fixes it. I unplugged during idle (which i realize is wrong but I was frustrated). Its out ta gas at the moment since I'm just trying to get it drive able. But I'll do that this weekend and post back.
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phonedawgz
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Report this Post07-30-2013 10:16 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
What you want to do is measure the voltage from the green wire to the black wire.-

You want to do it using back probing. Everything needs to still be connected up, both vacuum and electrical.



Two pins. One in the black, one in the green. When reading voltages on your meter make sure the voltages you are reading are in the .5v - 4.5v range. If the meter is saying mV, that is millivolt and that is way off. Most likely your pins are not touching the metal terminals inside the connector.

The voltages you should get are as such



Start with the key on engine off - you should get about 4.3. Start the engine and it should drop to about 1v at idle. Pop the throttle open and the voltage will jump up, and then when you snap the throttle back it will drop to below the about 1v and then when the engine returns to idle the voltage will return to about 1.

If all this works correctly, you may want to do this same check back probing directly at the ECM.

[This message has been edited by phonedawgz (edited 07-30-2013).]

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