Codes 64 and 27/ MAP sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 05-05-2007, 02:58 PM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: May 2006
Location: Hampshire, UK
Posts: 145
Thanks: 0
Thanked 0 Times in 0 Posts
Saturn Simon is on a distinguished road
Default Codes 64 and 27/ MAP sensor

Hi all. I have a 1988 Bonneville SSE Canadian-spec with the 3800 engine.

My SES light is on almost constantly and I'm getting codes 27 and 64.

According to the Haynes manual, 27 is "Quad Driver Module Circuit" and 64 is "Manifold Absolute Pressure (MAP) sensor voltage low (high vacuum) detected". My car does seem to display some of the symptoms related to code 64 which is lack of responsiveness and higher than usual fuel consumption.

Regarding code 64, the manual advises that I test the MAP sensor. However, I can't find the MAP sensor on my car. Where is my MAP sensor located?

Also, how do I tackle code 27? There is no mention of Quad Drivers in the manual.

Thanks,

Simon
Saturn Simon is offline   Reply With Quote
Old 05-05-2007, 03:08 PM   #2
jdq
Senior Member
Posts like a Corvette
 
Join Date: Nov 2005
Location: Hamilton, Ontario , Canada
Posts: 1,201
Thanks: 0
Thanked 0 Times in 0 Posts
jdq is on a distinguished road
Default

I may be wrong but isnt
27 - gear switch diagnosis (second gear switch)
64- exhaust gas recirculation
http://www.bonnevilleclub.com/forum/...e=article&k=68
I dont think you have a map sensor, I could be wrong.
jdq is offline   Reply With Quote
Old 05-05-2007, 04:19 PM   #3
Junior Member
 
Join Date: Aug 2005
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
wjcollier07 is on a distinguished road
Default

Well since you don't seem to have an FSM, here are the diagnostics for both the codes you mentioned.

Code 27

Code 64

Hope that helps yah

(FYI, these are from a 90 FSM if it matters, even though it shouldn't.)
wjcollier07 is offline   Reply With Quote
Old 05-05-2007, 05:25 PM   #4
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: May 2006
Location: Hampshire, UK
Posts: 145
Thanks: 0
Thanked 0 Times in 0 Posts
Saturn Simon is on a distinguished road
Default

Thanks very much guys!

You're right, wjcollier07 I don't have an FSM. I was directly quoting the Haynes manual for the codes. If the FSM says differnet than the Haynes manual must be very inaccurate and is even more useless than I thought it was. Shall I just burn it?
Saturn Simon is offline   Reply With Quote
Old 05-05-2007, 05:29 PM   #5
Junior Member
 
Join Date: Aug 2005
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
wjcollier07 is on a distinguished road
Default

I've never actually found generic service manuals to be very helpful. But its outstanding how much you can pack into one book about one car in one year. Theres nothing like a good FSM. If you ever find one, I suggest you jump on it, no matter the condition.

Its your new fire kindling I don't actually have one myself, thats how useless they are to me.

Hope you resolve your problems soon. And be sure to let me know if I can be of any more FSM assistance.
wjcollier07 is offline   Reply With Quote
Old 05-05-2007, 06:02 PM   #6
Senior Member
Posts like a Corvette
 
Join Date: Nov 2006
Location: Alberta, Canada
Posts: 1,446
Thanks: 0
Thanked 0 Times in 0 Posts
ddalder is on a distinguished road
Default Re: Codes 64 and 27/ MAP sensor

Quote:
Originally Posted by Saturn Simon
Hi all. I have a 1988 Bonneville SSE Canadian-spec with the 3800 engine.

My SES light is on almost constantly and I'm getting codes 27 and 64.

According to the Haynes manual, 27 is "Quad Driver Module Circuit" and 64 is "Manifold Absolute Pressure (MAP) sensor voltage low (high vacuum) detected". My car does seem to display some of the symptoms related to code 64 which is lack of responsiveness and higher than usual fuel consumption.

Regarding code 64, the manual advises that I test the MAP sensor. However, I can't find the MAP sensor on my car. Where is my MAP sensor located?

Also, how do I tackle code 27? There is no mention of Quad Drivers in the manual.

Thanks,

Simon
If my memory is correct, I fixed a similar problem on another car and I think you have to tackle the code 64 first. The car I fixed (a '91) the quad driver circuit is part of the PCM and is only servicealbe by replacing the computer. This however should not be necessary. The quad driver circuit in this case activates an electonic vacuum switch. The PCM is able to detect if the coil in the vacuum switch is open and will result in the code 27. It'* been a while, but I believe when a code 64 is set it can also trigger a code 27. Once the first problem is resolved, it may in turn take care of the second.
ddalder is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
P0107 and P0108 + question about MAP sensor Vitaliy 1992-1999 5 04-29-2007 01:34 PM
map o map harofreak00 Forum updates and suggestions 44 03-21-2005 03:04 AM
MAP Sensor Dylansdad 1992-1999 7 05-19-2003 11:32 AM
Can't Find MAP Sensor brvs 1987-1991 17 04-22-2003 12:40 AM
MAP sensor Dylansdad 1992-1999 1 03-04-2003 02:38 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:50 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.