PDA

View Full Version : MAP sensor

CraigSkiles
06-21-2002, 12:24 AM
Can someone tell me how to check to make sure the MAP sensor is working and what I should be looking for. Sort of like checking the TPS....

Thanks,

[ June 20, 2002, 21:24: Message edited by: CraigSkiles ]
irocbsa
06-21-2002, 12:37 AM
Probe the black wire on the connector with a test light to battery voltage. It should light. If not then that wire has a problem. The grey wire should have a 5v reference on it. If you have a scan tool you can jumper the green and grey wire and the MAP voltage should go to over 4V. If it doesn't then the sensor is bad. Not sure this is what you're looking for but HTH.
WS6 VERT
06-21-2002, 12:46 AM
If you have a scan tool you can jumper the green and grey wire and the MAP voltage should go to over 4V. If it doesn't then the sensor is bad Actually, if you jump them, and the scantool reading doesn't go to 5V, then you either lost your 5V reference, or the signal wire to the ECM is bad and the sensor is probably OK.
irocbsa
06-21-2002, 12:48 AM
Could it be??? Is Helms wrong??? :(
CraigSkiles
06-21-2002, 12:49 AM
It is, but what if you dont have a scan tool, but a handy dandy brand spanking new DVM? smile.gif
WS6 VERT
06-21-2002, 12:51 AM
You can use a DVOM and take your readings at the PCM. Doing that at the PCM will also help troubleshoot the circuitry.
irocbsa
06-21-2002, 12:51 AM
Ahhhhhhhhhh, OK. I see. If you have a MAP voltage of below .25V and the reading goes to over 4V when you jumper the two wires then you have a "faulty connection or sensor". Sorry.......
irocbsa
06-21-2002, 12:52 AM
Craig, do you not have your service manual on you??
CraigSkiles
06-21-2002, 12:58 AM
My service manual is for an 89, but the ECM being used is a HALTECH which requires a MAP sensor:)

Thanks for the info
WS6 VERT
06-21-2002, 01:02 AM
I guess you need me to scan you some pics?
irocbsa
06-21-2002, 01:16 AM
Craig, If you need to call me, 478-731-4444 and I can read you off the diagnostic procedure.
CraigSkiles
06-21-2002, 01:22 AM
Bernard is going to scan a pic for me, but htatbks :) I dont know when the next time I will be able to get back out to the car.
CraigSkiles
06-22-2002, 12:08 AM
Bernard, YES, please scan that pic for me.....

Have an interesting question about the MAP sensor, can it be mounted in any position?....
WS6 VERT
06-22-2002, 12:09 AM
I don't think the scale in the book is correct, I think its backwards...

A MAP sensor can be mounted anywhere, and I think any position...