Computer brain box

Tiny
STEVEN BRUMFIELD
  • MEMBER
  • 1997 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 238,569 MILES
Where is the computer brain box located on a 1997 pontiac bonneville because it wont start sometimes if it has been driven a little bit when its warm i, ve heard the 3.8, s have a history of this?
Do you
have the same problem?
Yes
No
Sunday, January 16th, 2011 AT 5:16 PM

17 Replies

Tiny
DOCFIXIT
  • EXPERT
Hello the PCM or brain box is located at the left front engine compartment. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Was this
answer
helpful?
Yes
No
+1
Sunday, January 16th, 2011 AT 8:44 PM
Tiny
DARRELLV
  • MEMBER
  • 1996 PONTIAC BONNEVILLE
Computer problem
1996 Pontiac Bonneville 6 cyl Two Wheel Drive Automatic 140k miles

This car will crank but not start. No spark No fuel pump No injector fire test light. Check eng. Light comes on when turn the key so ecm is getting power. Power seats move, all fuses are good.

Would you hang a ECM on it? WHERE IS THE ECM IN HIS CAR?
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
PCM is located Left front corner of engine compartment
I would suspect crank position sensor
and or security system

good luck
let me know
Was this
answer
helpful?
Yes
No
-1
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
DARRELLV
  • MEMBER
But if the Crank Sensor was bad. Would it keep the fuel pump from firing up?
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
When 1st key on does the fuel pump work for a few sec
with key ON do u have check engine light ON?
Do u have security light on or flashing
check for codes
check ignition module
Was this
answer
helpful?
Yes
No
+1
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
DARRELLV
  • MEMBER
Yes. When I 1st turn the key on. The Check Eng. Light comes on thinking the pcm has power to it Nothing flashes. No Security Light and I tried another key w/chip that we had for the car also. I already took off the Ignition Module and had it checked and it looked good even after I heated it up testing it a dozen times. AND NO THE FUEL PUMP DOES NOT FIRE UP AT ALL. No Fuel. No Spark
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
What about codes do u have any


http://www.2carpros.com/forum/automotive_pictures/99387_Graphic2_25.jpg

Was this
answer
helpful?
Yes
No
+1
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
MICHAEL SCHEFFLER
  • MEMBER
  • 1993 PONTIAC BONNEVILLE
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Where is the PCM located and what are the color codes for each plug?
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
DARRELLV
  • MEMBER
No codes that I know of. My son was driving the car when it died. He never siad anything about any lights etc. Etc. No Codes That I know Of. I don't have any way to check and read the code here myself anyway. But I understand why you ask.

Any ideal about it? WOULDN'T THE FUEL PUMP FIRE UP IF THE CRANK SENSOR WAS BAD? I can hang a crank sensor on it to try. But I'm thinking even if the sensor was ban the fuel pump would run. I'm not getting fire to the injectors or spark at plug wires.
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
HMAC300
  • EXPERT
There is only one plug as it is OBD1. See picture for location behind right hand side of dash do not forget to take prom out for new ECM.
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
Are u sure u have no spark?
When 1st key on the fuel pump should come on (good or bad crank sensor )
I hate for u to replace the PCM come to find out its some thing else
do every test possible because once u buy the PCM you own it.
Check if you have power getting to the fuel pump
and also check the relays
when cranking does check engine light go out or it stay on
checking for codes will help
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
DARRELLV
  • MEMBER
No spark at more than one plug wire. No injector pulse with test light. No Fuel Pump running when key turned on. Another key used/Ing. Mod. Tested good also. The ground wires must be ok power seat-windows work still. If crank sensor was bad I'd hang another one asap, but with the fuel pump not running I'm not sure it is?

Thinking maybe a PCM. Maybe BCM?
Was this
answer
helpful?
Yes
No
-1
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
LARRYMALEC
  • MEMBER
  • 1989 PONTIAC BONNEVILLE
  • 100,000 MILES
Car won't start or stay running for long. Checked the ohms on injectors and they all read 14-15 ohms, there is fuel in the rails but the plugs are dry. I pushed on the connectoer to the ign. Control module and pulled some plug wires and then it started, then stalled. Messsed with them again and it started. While running I pulled the vaccuum line for the fuel pressure reg. And pushed it back on and it stalled. No gas in vaccuum line. Could the fpr be bad. Or any other ideas. Thanks Larry
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
So do you have a intermittent no start? Shuts off while driving and wont start whats going on?Will it start now?
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
LARRYMALEC
  • MEMBER
It did start. But not there now to try, yes it has intermintant start, stalls while driving, and may not start again.
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
So when it doesnt start we need to check with a fuel pressure gauge what the fuel pressure is. If there is spark and if all that checks out then you will have to check for a injector pulse with a noid light. Also have you checked for codes?
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)
Tiny
QUEDAWG65
  • MEMBER
Make sure that the connector to your coil pack is dry at the connections. Take it off - some wd-40 then reinstall. White lithium grease is good there too. Im starting there since it responded when you moved the wires. There is an engine ground there also - check it for broken or loose connection. Make sure the harness connector is tight that is close to the coil packs as well.
Was this
answer
helpful?
Yes
No
Thursday, January 17th, 2019 AT 6:37 PM (Merged)

Please login or register to post a reply.

Recommended Guides