DTC P0101
The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates deceleration or idle. A large quantity of air entering the engine indicates an acceleration or high load situation. The MAF sensor has an ignition 1 voltage circuit, a ground circuit and a signal circuit. The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage in order to produce a frequency based on inlet air flow through the sensor bore. The PCM uses the barometric pressure, air density, manifold pressure, throttle position, and the engine RPM in order to calculate a predicted MAF value. The PCM compares the actual MAF sensor signal to the predicted MAF value in order to determine if the signal is stuck based on a lack of variation, or is too low or too high for a given operating condition. DTC P0101 will set if the actual MAF sensor signal is not within a predetermined range of the calculated MAF value.
Diagnostic Aids
Inspect for the following conditions:
• A misrouted harness--Inspect the harness of the MAF sensor in order to verify that the harness is not routed too close to the following components:
- The ignition cassettes
- Any solenoids
- Any relays
- Any motors
• The throttle plate sticking or excessive deposits on the throttle plate or in the throttle bore.
• Any unmetered air that enters the engine may cause this DTC to set. Verify that the oil dipstick is fully seated and the oil filler cap is secure.
• The MAF display should increase from 4-7 g/s at idle to 190 g/s or more at the 1-2 shift during a wide open acceleration. If not, inspect for a restriction.
• The barometric pressure that is used in order to calculate the predicted mass air flow value is based on the MAP sensor reading at key ON. A skewed MAP sensor will cause the calculated Mass Air Flow value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value displayed at or near sea level. The value decreases by approximately 3.0 kPa for every 1,000 feet of altitude.
SOURCE: 2000 mazda miata r&r throttle body
se if egr is controled by vacium or electric
if it is by vacium then locate the egr solenoide and make sure it has vacium in one hose w/ engine runing if it does then replace solenoide
SOURCE: 1999 cadillac deville overheating
my husband did everything that everyone else did that had this overheating problem. It was so weird that my engine cooled at a light and heated up going down the road. I have a north star 4.6 engine and this is natorious for happening. my check engine light also came on and so I had a diagnostics done which told me my #1 injector wasn't firing , car ran like **** as well. After putting in a new water pump and plugs,ect. and realized injector was good a friend told him we could have a blown head gasket. So just to see if this was the problem I went to buy a bottle of glassbeads and the auto parts guy told us to purchase a bottle of BARS STOP LEAK BLOCK SEALER NOT RADIATOR BUT BLOCK SEALER $31.99 . He followed the directions and we waited 24 hrs. before driving it. What ever the problem was has stopped my car runs like brand new and I am loving it again. no over heating no injector problem, runs great.......I hope this helps. I know its probly a temperary fix but its a fix and now we know what the problem was. SASSY
SOURCE: 2000 cadillac deville check coolant message comes on but coolant
the sensor in the anti freeze bottle some times it sticks some times a light tap will loosen it up but some times you need to replace it
SOURCE: service engine light on 2001 blazer
with the p0101 make sure you have a clean air filter. it can be bad spark plugs and or wires, or a leak in the air intake system
SOURCE: I have a 2001 Ford Escape xlt V6 3.0L engine.. I
hope this helps,Tim:
http://www.obd-codes.com/p0401
107 views
Usually answered in minutes!
×