i have an OBDLink MX+ obd scanner that i use from time to time...

i noticed the other day that my MAP sensor value with Key On Engine Off was about 8in hg, which is about 3 times too low for local atmospheric pressure.

i backprobed cavity A27 at the PCM and got 3.93V (which I believe to be a good value here in Denver), but the scanning software is giving the low abs. pressure value.

is anyone aware of any OBD II problems with any of the standard PIDs for this transition year XJ?

thanks!

 

Known bug in some '96 XJs. PCM reports MAP at KOEO wrong. Your actual voltage is fine. Scan tool shows wrong value. Engine running, it should read okay.

 

that was my suspicion (after replacing it with a new one and seeing the same behavior)--thanks for confirming!

at least now i have a spare...

 

are there any other bugs known to the community?