Chevy Camaro Engine Questions

[brlarl]

HAHAHAHAHA!!!  Like the photo!! I will post the photos soon.  Thanks

[brlarl]

The smaller of the two is what is know as a Burn Off Module "MAS".  I believe this is only on the 85 TPI motors in the IROC-Z?  Thanks in advance.

[SUX2BU99]

Well with a 20 year old ECM that is subjected to vibration, moisture, heat and plain old age, solders on computer boards can get weak or wire leads on electronic components get corroded. If you tapped on it and it changed performance, replace that module with a known good unit.

[brlarl]

The ECM HAS been changed.  The smaller of the two is what I'm not too sure of.  Heck I have never heard of a Burn Off Module, I need to know was it is and what it is for.  Thanks for the input.

[brlarl]

Here is the schematic from what I have been able to find on this small module?

[VileZambonie]

LOL OK now I know what you're talkin bout!

Burn off was for the MAF sensor- it's designed to burn off any cocky that gets on the maf sensor when you shut the car off. It's supposed to make the hot wire burn off anything - Let me see if I can find any detailed info on it for you.

[VileZambonie]

CHART C-13, MAF BURN-OFF CHECK (5.0L)

Due to contaminates in the atmosphere a residue may build up on the air flow meters sensing wire. To maintain an accurate reading from the meter a "burn-off" cycle will only occur if the ignition is turned off while in the closed loop mode and this is determined by the sate of the serial data line (CKT 461). If the engine is shut down while in open loop or the ignition is cycled on to off, the serial data line will be in a high state (about 5 volts) and remain there for about 5 seconds. However, if the ignition is turned off while in closed loop the serial data line will go to about 2.5 volts for 5 seconds. This voltage (2.5 volts or less) is what triggers the control circuitry in the burn off module and causes burn-off to occur. When the conditions are met to activate burn-off, a 3 to 5 second delay will couur. After this delay the control circuitry will cause 12 volts to be applied on CKT 994 for 1 second and this will cause the meters sensing wire to glow red hot (about 1000°F) and the cycle is then complete.
A Code 33 or 34 will set if the airmeter fails and the same circuitry is used for MAF output as for burn off. Therefore the only functional check needed for the burn-off function is to check whether the burn-off signal is reaching the air meter after engine shutdown.



In order for the burn-off cycle to function, the 12 volts on terminal E must remain until the burn-off signal occurs. This checks for the 12 volt shut down delay.


Grounding the ALCL terminal E causes the burn-off module to activate burnoff. This check will determine if the burn off module and wiring are OK.

[VileZambonie]

Sorry the image size restriction shrunk the flowchart and it's nearly impossible to read

[brlarl]

Thanks for the info.  Did you obtain the flow chart in AllData Pro?  If so can you give me the path to find it so that I can read info?    Thanks again!

[brlarl]

One other question..........Can this module make the car run as if it has a real bad miss?  I've checked and checked then double checked all the grounds and have not found any problems.  After replacing the ECM and noticing this smaller module deals with the MAF I figure this may bee the problem.  But again can this make the engine run like C#&P?  Thanks Again.