Code P0106, MAP sensor

Tiny
COOLCELL
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 297,000 MILES
Got the P0106 code: Map/BARO CHK Range/Pref on my vehicle listed above (EXT Sl) today.

Going to make my DIY smoke vacuum leak tester tomorrow. :)

Not sure if maybe I have a bad MAP sensor or vacuum leak in the system or bad intake manifold.


When idling at 600 RPM's what is the normal voltage and kPa should I see on the live data?

When I increase rpm's should the kPa and Voltage increase or decrease?

Thank you
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Wednesday, November 13th, 2019 AT 10:06 PM

10 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

There is a lot to this code. It could be the sensor, vacuum leak to the sensor or another mechanical issue.

How does it run? Are there any issues driving it?

Can you give me some background?

Roy

DTC P0106

CIRCUIT DESCRIPTION
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:
A 5-volt reference circuit
A low reference circuit
A MAP sensor signal circuit

The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide-open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.

The PCM calculates a predicted value for the MAP sensor based on throttle position (TP) and engine speed. The PCM then compares the predicted value to the actual MAP sensor signal. If the PCM detects that the MAP sensor signal is not within the predicted range, DTC P0106 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0106 Manifold Absolute Pressure (MAP) Sensor Performance

CONDITIONS FOR RUNNING THE DTC
DTC P0068, P0107, P0108, P0117, P0118, P0120, P0122, P0123, P0125, P0128, P0130, P0131, P0132, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0336, P0340, P0341, P0442, P0446, P0452, P0453, P0455, P0496, P0502, P0506, P0507, P0641, P0651, P0740, P0741, P0742, P1516, P1680, P1681, P1860, P2101, P2120, P2125, P2135, P2138, or P2176 is not set.
The engine run time is greater than 40 seconds.
The change in engine speed is less than 50 RPM.
The engine speed is between 600-6,375 RPM.
The torque converter clutch (TCC) is stable to within 2.5 percent.
The above conditions are met for 1.5 seconds.
DTC P0106 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The PCM detects that the MAP sensor voltage is not within the predicted range for more than 14 seconds.

ACTION TAKEN WHEN THE DTC SETS
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
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Thursday, November 14th, 2019 AT 6:53 AM
Tiny
COOLCELL
  • MEMBER
As far as it driving it seems a little heavy on the pedal when making the vehicle accelerate. You can not push it hard going uphill or accelerate fast between 35 and 45 range or the engine will loss power if I let off the gas pedal when this happens it will recover. Like a one second hesitation or pause then recovers when let off gas. If not it will shut the engine down and get P2135, P2136, P106.
Has a new throttle body and camshaft solenoid plus relearned cam.
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Thursday, November 14th, 2019 AT 10:01 AM
Tiny
COOLCELL
  • MEMBER
Weird the site will only let me post short messages?

Could this be just a vacuum leak?
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Thursday, November 14th, 2019 AT 10:05 AM
Tiny
ASEMASTER6371
  • EXPERT
Did you follow the flow charts I posted? What were the results?

Roy
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Thursday, November 14th, 2019 AT 10:09 AM
Tiny
COOLCELL
  • MEMBER
I will have to work on it Friday cancer treatment has me sick right now.

See videos on this post please so don't have to upload the videos two times.

https://www.2carpros.com/questions/05-trial-blazer-weird-security-system-issue#last
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Thursday, November 14th, 2019 AT 1:18 PM
Tiny
ASEMASTER6371
  • EXPERT
Security has nothing to do with this since it runs.

Follow the flow chart and let me know what happens.

Roy
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Thursday, November 14th, 2019 AT 1:26 PM
Tiny
COOLCELL
  • MEMBER
I'm uploading a second video now. I tried to put both on one post it would not let me.
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Thursday, November 14th, 2019 AT 1:29 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay.

Roy
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Thursday, November 14th, 2019 AT 1:29 PM
Tiny
COOLCELL
  • MEMBER
Ug! My internet crashed while trying to up load the video to the site.

I'm sicker than heck from chemo treatment for my neck cancer. I'll try tonight or tomorrow morning. Sorry
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Thursday, November 14th, 2019 AT 2:04 PM
Tiny
ASEMASTER6371
  • EXPERT
No worries. Take your time.

Roy
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Thursday, November 14th, 2019 AT 2:09 PM

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