Po105 manifold pressure - 1995 Toyota Supra

code p 0121 is associated with the throttle position sensor and accelerator position sensor
causes are from cable adjustment --throttle position and accelerator position sensors
code p0533 refers to ac refrigerant pressure sensor--high input== causes --ac pressure too high (cooling fault -condenser fan not running at radiator-- too much gas --pressure sensor
p 0105 refers to map sensor / barometric pressure sensor --circuit malfunction===causes wiring--- map sensor --baro sensor ECM
code p0566 refers to cruise control master switch== causes --control switch , ---ECM
code p1582 refers to electronic throttle monitor data available which will be associated with the p 0121 code and faults

code po105 refers to manifold absolute pressure(MAP)sensor/barometric pressure (BHARO) sensor -circuit malfunction==causes--wiring MAP sensor--BARO sensor--ECM
code p0171 refers to system to lean bank 1===causes intake/exhaust leak---AIR system MAF/MAP sensor fuel pressure /pump /injectors--HO2SW
code p0325 refers to knock sensor(KS) 1 bank 1-circuit malfunction====causes--wiring ---poor connections---KS
Check the exhaust flexible pipe at the manifold for cracks
have a fuel pressure test done on the fuel manifold to determine either pump/ filter or pressure regulator.
replace HO2S unit

OBD=11
code p0171 refers to system to lean---causes ---intake/ exhaust leak---air system---MAF/VAF sensor---fuel pressure/ pump---injectors HO2s
code po105 refers to manifold absolute pressure (MAP) sensor/bar ometric sensor and circuit malfunction causes---wiring---MAP sensor ECM
code p0760 refers to shift solenoid--circuit malfunction causes--shift solenoid---ECM?TCM
code po770 again refers to shift solenoid.
code p0171 again refers to shift solenoid ---performance or stuck off.
code po130 refers to heated oxygen sensor HOS2 1 bank 1-circuit and have the rest checked .malfunction -- causes---heating inoperative---poor connection---wiring--- HO2S. So replace the shift solenoid and oxygen sensor

P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction,

Symptoms of a P0105 check engine light code may include:

• Poor running engine
• Engine runs rich
• Engine won't idle
• Engine backfires through tailpipe
• Engine misfire under load or at idle
• MIL (Malfunction Indicator Lamp) illumination
• In some extreme cases there may be no symptoms other than MIL illumination, could be caused by:
  • MAP sensor vacuum hose disconnected or plugged
  • Bad MAP sensor
  • Bad TPS good-day !

P0105 = Manifold Absolute Pressure Sensor Circuit Malfunction
I assume the code will not clear when you try to erase it? Either the circuit (wiring) is damaged, or the ECU memory won't reset/erase the code. If you know the wiring & MAP sensor are ok, try zero-ing the electrical system (disconnect the negative battery cable and connect a wire to the negative battery cable & connect the other end of the wire to the positive battery cable for 30 seconds. Remove the wire & reconnect the negative battery cable to the negative battery post. Now, this shoud have erased the memory in the ECU and there should be no code(s) present. If the code is still there, (and there's nothing wrong with the wiring between the MAP sensor & the ECU), the ECU is faulty.

It's just to the right of the throttle body. Follow the air cleaner hose, from the air cleaner. Goes from the air cleaner up to near the firewall, then turns right and into the throttle body. On top of the upper intake manifold is the MAP sensor. Probably the easies sensor to replace on the entire engine. Just inplug and replace.

Here's some reading material for you.. so it makes a little more sense -

sensor info - http://www.aa1car.com/library/1999/cm69910.htm

Hi,
OBD II Fault Code

• OBD II P0108

Fault Code Definition
The Manifold Absolute Pressure Sensor/Barometric Pressure Sensor measures the rise and fall of the air pressure inside the Intake Manifold. This provides critical data needed for the Power Train Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, and many components of the Emissions Control Systems. The Manifold Absolute Pressure/Barometric Pressure Sensor converts the Intake Manifold air pressure into a voltage that is high when the Intake Manifold air pressure is high and low when the Intake Manifold air pressure drops to a vacuum. The P0108 code indicates a high voltage input from the Manifold Absolute Pressure Sensor/Barometric Pressure Sensor to the Power Train Control Module.
Symptoms

• Check Engine Light will illuminate
• In many cases, no abnormal symptoms may be noticed
• In some cases, the engine may be hard starting and/or get poor fuel economy
• In some cases, noticeably poor engine performance may occur

Common Problems That Trigger the P0108 Code

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is defective
  
• Intake Manifold vacuum leaks
• Faulty or corroded Manifold Absolute Pressure Sensor/Barometric Pressure wiring or connections

Common Misdiagnoses

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is an Intake Manifold vacuum leak
  
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is a stuck-open EGR Valve
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real problem is a defective Idle Air Control Motor, which causes a very low engine idle

OBD2 engine code PO105 is Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

P0105 is MAP (Manifold Absolute Pressure) or BARO (Barometric pressure) circuit malfunction