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Discussion Starter #1 (Edited)
11 Evora S. Brake light and now P0106 & P0101

Have had a red brake light for a year now with NO effects on anything. Seems to be a CANBUS error.

Now I am getting P0101 and P0106 which point to either a MAP or MAF. Has intermittently had a wrench on occasion (long trips) for a year, but now has decided to compromise the vehicle. I could always throw parts at it , but first ??? Could they all be related??
 

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Well, I don't think we have a MAP sensor, so the P0106 is an odd one.

Do you have the magical zip-tie on the MAF sensor? If not, might be worth giving it a clean and adding it.

Brake light I would assume is ABS related? You won't be able to read it with normal tools, but you can probably get the actual diagnostic from it via techcenter. Seems anything from the ABS/TCS module is obscured away from the main OBD code reporter.
 

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Discussion Starter #3
Had just cleaned MAF prior to track time at WGI., so at that time it was removed and replaced and I have pushed on it to make sure its firmly attached. Also had installed a new air filter over the winter and rechecked all those clamps but being before the MAF, that should not be an issue. I am suspicious of a vacuum leak. Ever since the vehicle was new, when I put it in sport mode and the idle increases, it was was always rough at idle. Service tech has it in his notes. Never affected performance. I suspect there is something not quite right beyond throwing a new MAF at it etc. Recently, I have been noticing a bit of a high rpm miss from ~6300rpms on up esp at 6500rpm in 4rth under WOT. Its one of the reasons I cleaned MAF and throttle body...and just did the plugs. Everything was pointing to a high rpm electrical misfire.
 

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Illegal Alien
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Pulling direct from Service Notes:

Intake Air Flow

P0101 Mass or Volume Air Flow Circuit Range/Performance

P0102 Mass or Volume Air Flow Circuit Low Input

P0103 Mass or Volume Air Flow Circuit High Input

Description

The Mass Air Flow (MAF) sensor is incorporated into the airbox, and measures both intake air flow rate and
Intake Air Temperature (IAT). The MAF sensor uses a hot wire exposed to the airflow, which is maintained
at a constant temperature by a constant current flow. This is achieved within the sensor unit by varying the
voltage applied to the hot wire. This voltage is the output signal from the MAF sensor.

Sensor connections

Sensor Connector Description ECU Pin ECU Connector

1 IAT Signal E3 48 Way (Centre)

2 IAT Ground J3 48 Way (Centre)

3 Battery Voltage - -

4 MAF Ground J4 48 Way (Centre)

5 MAF Signal G1 48 Way (Centre)

Sensor characteristics

0 – 330 g/sec

Typical values: 1.5 – 5.0 g/sec (idle), 5.0 – 15.0 g/sec (2500rpm elevated idle no load)

P0101

Monitor:

• Continuous.

Enable Criteria:

• Engine running

• Engine speed >1500rpm

• Engine speed < 3510rpm

• Fuel Learns enabled

Disable Criteria:

• P0122, P0123, P0222, P0223 – Throttle/Pedal position fault codes

Malfunction Criteria:

• Measured MAF is compared to a predicted MAF based on current engine conditions.

• Error > 40% for time > 1.5 secs

Potential failure modes:

• MAF meter

• Air induction system

• Air intake hose connections


Diagnostic Mask:

• The MIL will be illuminated if the faults are present for 2 consecutive trips
 

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Illegal Alien
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]]]Barometric Pressure

P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance

P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Description

The barometric pressure sensor is located internally within the ECU, and measures atmospheric pressure.
This parameter is required to compensate the mass air flow when the vehicle is operated at higher altitudes.

P0106

Monitor:

• Continuous

Enable Criteria:

• Engine running

• Engine speed 2010 – 5490rpm & TPS > 80%

• Engine speed 1500 – 2500rpm & 12.5% < TPS < 22.5%

Disable Criteria:

• P0101, P0102, P0103 – MAF Sensor fault codes

• P0121, P0122, P0123, P0222, P0223, P2135 – Throttle/Pedal position fault codes

Malfunction Criteria:

• Measured Baro is compared to a predicted Baro based on current engine conditions.

• Error > 150kPa for time > 4.5 seconds.

Potential failure modes:

• Sensor failure

• MAF sensor error

• Inlet manifold air leak


Diagnostic Mask:

• The MIL will be illuminated if the faults are present for 2 consecutive trips


Common denominator to P0101 and P0106, failed MAF or downstream air leak at manifold
 

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Illegal Alien
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Well, I don't think we have a MAP sensor, so the P0106 is an odd one.

Do you have the magical zip-tie on the MAF sensor? If not, might be worth giving it a clean and adding it.

Brake light I would assume is ABS related? You won't be able to read it with normal tools, but you can probably get the actual diagnostic from it via techcenter. Seems anything from the ABS/TCS module is obscured away from the main OBD code reporter.
MAP is within ECU box
 

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Discussion Starter #8
Thanks Julian. CANBUS error points to something being awry. I could have just gottren an MAF and put it in, but it would not completely explain the other issues, thus reason, as a non- electrical wrenchhead, that I bought it to the dealer. It exited my realm. O2 sensors etc yes, checking current loops, continuity etc....no. Regardless, I just hope we get it fixed. My toy was entering its busy season and although I had a hoot with the Miata yesterday, it really needs 100 more HP to complete the deal. In other words, my old Elise was like that 100HP because it was 200HP (CharlieX tune) and weighed 600 lbs less.
 
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