Thread: Code P0106 Not Boosted
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Old 08-28-2018, 02:22 AM   #4 (permalink)
Jhill
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Join Date: Mar 2016
Location: San jose
Posts: 854
Drives: 2013 370z sport
Rep Power: 3385
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Originally Posted by kaliwraith View Post
Vehicle mods (No Tune):
1. Z1 CAI
2. Beluga Racing Exhaust (will replace soon, came with the car, is pretty banged up).

Last night I started my car and got the SES light. I ran a short errand and the car felt OK. I didn't hit it hard though, because of the code.

When I got back I use my Autel reader to get the code P0106. I cleared the code. I drove to work and back today and it hasn't returned.

After reading threads, specifically this one, I took a few measurements with my reader.

Baro: 14.4 PSI
MAP KOEO: 13.6 PSI (???)
MAP idle: ~5 PSI
IDLE RPM: 650

My next steps are to:

1. Check the input voltage and ground impedance for the wiring to the sensor
2. Check the sensor impedance (unlikely to find anything useful as the sensor is still working).
3. If i can get a probe in there, check the sensor output voltage with KOEO (key on engine off).

Anyone seen this type of issue where the MAP sensor is not quite showing atmosphere with KOEO? Most threads seem to suggest electrical problems (intermittent shorts, open circuits), although no one has provided PSI measurements to compare. How can I determine if it's my sensor kicking the bucket?

Thanks for the help.
I’ll check my data tomorrow but I thought the z used the map for baro on start up. With different readings I guess I would have to assume it has a a separate baro sensor, maybe built into the pcm like Honda but no so common on MAF cars. Maybe try disconnecting the map koeo to confirm they don’t share the sensor.

If it does have a separate sensor then do the basics at the sensor, 5v ref, v drop on the ground, voltage output on the sig wire and if your scanner has the ability compare the sig out voltage with the sig voltage in pcm data to confirm there is no v drop accross sig wire/terminals. But yes koeo map and baro should be the same (as far as any other line I’ve ever seen).
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