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Old 04-26-2021, 02:40 AM   #1
Martypjohnston
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Member#: 523926
Join Date: Apr 2021
Default P0107 MAP sensor too low

2005 Subaru WRX stage 3 with Cobb access port. MAP sensor is a brand new Cobb, 4 bar. I have reference voltage and a signal at the sensor and the ECU and my ground is good. I have checked for any external vacuum leaks and haven't found any. Car seems to run ok after it gets warm. Has an air/oil separator that was full of sludge, cleaned that out, and runs better, however, my MAP sensor throws a P0107 code when I decelerate at higher RPMs. When watching the MAP voltage on the access port I can see the voltage drop to 1.45v and the CEL comes on instantly,, although, it must be going lower than that to set the code. I can clear the codes and make it come back on by letting off the gas every time. This is the only time the code will set. Can something be set wrong in the tune cuz I can't find any other problems.
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Old 04-26-2021, 05:54 AM   #2
murrdogg24
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Member#: 50586
Join Date: Dec 2003
Chapter/Region: BAIC
Location: Chiraq
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64 Impala

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You can't just throw in a 4 bar map sensor with an off the shelf Cobb map. You need an actual pro tune because the tune needs to be calibrated for the increased map sensor.
Quote:
Originally Posted by Martypjohnston View Post
2005 Subaru WRX stage 3 with Cobb access port. MAP sensor is a brand new Cobb, 4 bar. I have reference voltage and a signal at the sensor and the ECU and my ground is good. I have checked for any external vacuum leaks and haven't found any. Car seems to run ok after it gets warm. Has an air/oil separator that was full of sludge, cleaned that out, and runs better, however, my MAP sensor throws a P0107 code when I decelerate at higher RPMs. When watching the MAP voltage on the access port I can see the voltage drop to 1.45v and the CEL comes on instantly,, although, it must be going lower than that to set the code. I can clear the codes and make it come back on by letting off the gas every time. This is the only time the code will set. Can something be set wrong in the tune cuz I can't find any other problems.
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Old 04-28-2021, 02:47 PM   #3
Martypjohnston
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Member#: 523926
Join Date: Apr 2021
Default

Your are correct. The car had a Cobb 4 bar map sensor installed when it was professionally tuned. I couldnt find any vacuum leaks, checked ground, signal and power and all were good so I put a new sensor in it
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Old 04-28-2021, 04:14 PM   #4
kopele
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Member#: 363007
Join Date: Jul 2013
Chapter/Region: MWSOC
Location: MO
Vehicle:
2008 STI
Black

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Get a log to verify the voltage, if it's an intermittent voltage drop you might not see it on the display. If tuned properly the CEL should be trigger at 0.25V. If it wasn't tuned properly it would throw the cell shortly after startup.
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