P0101 with new MAF?
02-17-19, 01:50 AM
#1
Driver School Candidate
Thread Starter
P0101 with new MAF? New code p0172 and p0175
Hey. Im new Lexus IS 250 2010 owner. I bought it from USA (iaai). I have a problem with code P0101 Mass Air Flow (MAF) Circuit / Performance Malfunction, but my car work good. My average burning is 9.5l / 100km, no engine stalling, no problem, no power or rough idle. I dont have any symptoms. I have original Denso MAF, and for test replace it from Lexus ISF and on my car have still p0101 problem, on isf and my MAF no any problem. I change air filter, PVC valve, clean MAF and still have this. Has anyone encountered such a problem or something similar?
Last edited by wieszkto; 03-03-19 at 05:23 AM.
02-17-19, 05:01 AM
#2
P0101 ( for Lexus anyway) comes back with these pointers
Possible causes
Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection.
Read more: https://www.autocodes.com/p0101_lexus.html
Possible causes
Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection.
Read more: https://www.autocodes.com/p0101_lexus.html
02-17-19, 02:21 PM
#3
Driver School Candidate
Thread Starter
P0101 ( for Lexus anyway) comes back with these pointers
Possible causes
Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection.
Read more: https://www.autocodes.com/p0101_lexus.html
Possible causes
Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection.
Read more: https://www.autocodes.com/p0101_lexus.html
I clean MAF
New air filter
How check Mass air flow sensor harness is open or shorted and Mass air flow sensor circuit poor electrical connection? In live data everything looks good
02-17-19, 03:05 PM
#4
Lexus Test Driver
ISF MAF to IS ECU
^^^ This is your issue.
Even though they have the same connector, the pins are in different location.
Hence, different inputs to the ECU from the ISF MAF.
A 3UZ and a 2JZ MAF from the same year IS is interchangeable.
But not from an ISF.
^^^ This is your issue.
Even though they have the same connector, the pins are in different location.
Hence, different inputs to the ECU from the ISF MAF.
A 3UZ and a 2JZ MAF from the same year IS is interchangeable.
But not from an ISF.
02-18-19, 07:54 AM
#6
Lexus Test Driver
You are correct.
22204-31020 part #s for both.
Disregard my comment.
My apologies.
If you are still getting the same code from 2 MAF sensors, it could be a wiring or ECM issue.
Or might want to try another known good MAF from a working vehicle with no P0101 code.
22204-31020 part #s for both.
Disregard my comment.
My apologies.
If you are still getting the same code from 2 MAF sensors, it could be a wiring or ECM issue.
Or might want to try another known good MAF from a working vehicle with no P0101 code.
02-18-19, 10:42 PM
#7
Driver School Candidate
Thread Starter
I think maf is good because both work good in isf.
But how check maf wiring and ecu? Nobody in my country don't want check this. Everybody repair only german cars...
I wait for mini vci from aliexpress maybe in tis i can check something?
But how check maf wiring and ecu? Nobody in my country don't want check this. Everybody repair only german cars...
I wait for mini vci from aliexpress maybe in tis i can check something?
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02-19-19, 06:25 AM
#8
There was a thread on here with lexus repair instructions in the last 9mo or so. In short in instructed one how to test and repair this.
I'd start thoroughly inspecting the wires and connector. If nothing is found your options are to trace those colored wires back to the ECM and ohm them out. I would suggest you get the schematic and troubleshooting tips...
There is power, a ground, and some sort of bridge being formed. You should be able to confirm some functionality without tracing back to the ECM.
Use the search function. See what you find.
I'd start thoroughly inspecting the wires and connector. If nothing is found your options are to trace those colored wires back to the ECM and ohm them out. I would suggest you get the schematic and troubleshooting tips...
There is power, a ground, and some sort of bridge being formed. You should be able to confirm some functionality without tracing back to the ECM.
Use the search function. See what you find.
02-19-19, 11:48 AM
#9
Post # 8, read the pdf. That said it may not be 100% applicable to our IS...
https://www.clublexus.com/forums/rx-...maf-p0171.html
There is one for the IS, just not sure where it is.
https://www.clublexus.com/forums/rx-...maf-p0171.html
There is one for the IS, just not sure where it is.
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wieszkto (02-21-19)
02-19-19, 04:44 PM
#10
Lexus Test Driver
If you can get a data list or freeze frame when the P0101 code set, that would help us decipher it.
Im assuming you already check for possible vacuum/air leaks.
Im assuming you already check for possible vacuum/air leaks.
02-20-19, 12:20 PM
#11
Driver School Candidate
Thread Starter
Thanks for this thread i check maf in saturday.
Freeze frame when p0101 code set :
I check possible vacuum/air leaks three or four times and dont have nothing
I think about this Fuel Trim Bank 1/2 Long Term, Its normal this have -20%?
About Ambient air temp i dont have sensor yet
Freeze frame when p0101 code set :
Freeze frame information:
------------------
Fuel Status = 0 byte
Engine Load = 79.216 %
Engine Coolant Temperature = 83 °C
Fuel Trim Bank 1 Short Term = -2.344 %
Fuel Trim Bank 1 Long Term = -19.531 %
Fuel Trim Bank 2 Short Term = -2.344 %
Fuel Trim Bank 2 Long Term = -20.312 %
Engine RPM = 1,686.5 rpm
Speed (OBD) = 90 km/h
Timing Advance = 15 °
Intake Air Temperature = 8 °C
Mass Air Flow Rate = 26.5 g/s
Throttle Position(Manifold) = 21.961 %
Run time since engine start = 467 s
Fuel Rail Pressure = 1,694.041 psi
O2 Sensor1 Equivalence Ratio = 0.991
O2 Sensor5 Equivalence Ratio = 0.993
Distance travelled since codes cleared = 46 km
Barometric pressure (from vehicle) = 14.359 psi
O2 Sensor1 Equivalence Ratio(alternate) = 0.991
Catalyst Temperature (Bank 1,Sensor 1) = 690.7 °C
Catalyst Temperature (Bank 2,Sensor 1) = 690.7 °C
Catalyst Temperature (Bank 1,Sensor 2) = 690.7 °C
Catalyst Temperature (Bank 2,Sensor 2) = 690.7 °C
Voltage (Control Module) = 13.574 V
Engine Load(Absolute) = 63.529 %
Commanded Equivalence Ratio(lambda) = 0.993
Relative Throttle Position = 5.49 %
Ambient air temp = -38 °C
Absolute Throttle Position B = 55.294 %
Accelerator PedalPosition D = 16.078 %
Accelerator PedalPosition E = 31.765 %
End of report.
------------------
Fuel Status = 0 byte
Engine Load = 79.216 %
Engine Coolant Temperature = 83 °C
Fuel Trim Bank 1 Short Term = -2.344 %
Fuel Trim Bank 1 Long Term = -19.531 %
Fuel Trim Bank 2 Short Term = -2.344 %
Fuel Trim Bank 2 Long Term = -20.312 %
Engine RPM = 1,686.5 rpm
Speed (OBD) = 90 km/h
Timing Advance = 15 °
Intake Air Temperature = 8 °C
Mass Air Flow Rate = 26.5 g/s
Throttle Position(Manifold) = 21.961 %
Run time since engine start = 467 s
Fuel Rail Pressure = 1,694.041 psi
O2 Sensor1 Equivalence Ratio = 0.991
O2 Sensor5 Equivalence Ratio = 0.993
Distance travelled since codes cleared = 46 km
Barometric pressure (from vehicle) = 14.359 psi
O2 Sensor1 Equivalence Ratio(alternate) = 0.991
Catalyst Temperature (Bank 1,Sensor 1) = 690.7 °C
Catalyst Temperature (Bank 2,Sensor 1) = 690.7 °C
Catalyst Temperature (Bank 1,Sensor 2) = 690.7 °C
Catalyst Temperature (Bank 2,Sensor 2) = 690.7 °C
Voltage (Control Module) = 13.574 V
Engine Load(Absolute) = 63.529 %
Commanded Equivalence Ratio(lambda) = 0.993
Relative Throttle Position = 5.49 %
Ambient air temp = -38 °C
Absolute Throttle Position B = 55.294 %
Accelerator PedalPosition D = 16.078 %
Accelerator PedalPosition E = 31.765 %
End of report.
I think about this Fuel Trim Bank 1/2 Long Term, Its normal this have -20%?
About Ambient air temp i dont have sensor yet
02-20-19, 03:46 PM
#12
Lexus Test Driver
Dang...!
You are running FAT.
Very rich thats why LT Fuel trims is reading on the negative side. (over -20% <--- this is whats partly triggering the P0101)
Meaning ECU is trying to LEAN it out.
But why isnt it triggering a RICH code?
Maybe the ECU can still compensate but triggers the P0101?
Mass Air Flow Rate = 26.5 g/s <-- hmmm
Can you check Baro pressure and MAF rate at idle?
Let me know your findings when you get a chance.
Engine load at 80% is a bit much at just cruising speed
I also dont understand CAT temps.
After CAT temps should be cooler than before CAT temps. <--- they are the same on your freeze frame.
Are you running w/out CATs?
Is your vehicle stock on is there anything aftermarket added?
The only things i have in question are the CAT temps and why is it running RICH at cruising speed.
Can you check these fuel trims at idle?
Let us know what values come up.
I'd like to see AF sensor voltages if you have them in your data list as well.
Thanks for providing the freeze frame.
You are running FAT.
Very rich thats why LT Fuel trims is reading on the negative side. (over -20% <--- this is whats partly triggering the P0101)
Meaning ECU is trying to LEAN it out.
But why isnt it triggering a RICH code?
Maybe the ECU can still compensate but triggers the P0101?
Mass Air Flow Rate = 26.5 g/s <-- hmmm
Can you check Baro pressure and MAF rate at idle?
Let me know your findings when you get a chance.
Engine load at 80% is a bit much at just cruising speed
I also dont understand CAT temps.
After CAT temps should be cooler than before CAT temps. <--- they are the same on your freeze frame.
Are you running w/out CATs?
Is your vehicle stock on is there anything aftermarket added?
The only things i have in question are the CAT temps and why is it running RICH at cruising speed.
Can you check these fuel trims at idle?
Let us know what values come up.
I'd like to see AF sensor voltages if you have them in your data list as well.
Thanks for providing the freeze frame.
02-20-19, 04:36 PM
#13
Thanks for this thread i check maf in saturday.
Freeze frame when p0101 code set :
I check possible vacuum/air leaks three or four times and dont have nothing
I think about this Fuel Trim Bank 1/2 Long Term, Its normal this have -20%?
About Ambient air temp i dont have sensor yet
Freeze frame when p0101 code set :
I check possible vacuum/air leaks three or four times and dont have nothing
I think about this Fuel Trim Bank 1/2 Long Term, Its normal this have -20%?
About Ambient air temp i dont have sensor yet
My car has wierd fuel trims in cold weather. At idle it will be around -13 bank 1 bank 2 will be at +1.3 - + 2.3. once fully warmed up while cruising it will be bank 1 short 0 long .8
Bank 2 short 0 long + 2.3 give or take. Said that once at idle again it will creep up back to bank1 long term +13 all others near 0.
At idle the MAF should be around 2.3 to 2.6 g/s at idle.
Last edited by MikeFig82; 02-20-19 at 04:44 PM.
02-21-19, 10:54 AM
#15
Driver School Candidate
Thread Starter
Dang...!
You are running FAT.
Very rich thats why LT Fuel trims is reading on the negative side. (over -20% <--- this is whats partly triggering the P0101)
Meaning ECU is trying to LEAN it out.
But why isnt it triggering a RICH code?
Maybe the ECU can still compensate but triggers the P0101?
Mass Air Flow Rate = 26.5 g/s <-- hmmm
Can you check Baro pressure and MAF rate at idle?
Let me know your findings when you get a chance.
Engine load at 80% is a bit much at just cruising speed
I also dont understand CAT temps.
After CAT temps should be cooler than before CAT temps. <--- they are the same on your freeze frame.
Are you running w/out CATs?
Is your vehicle stock on is there anything aftermarket added?
The only things i have in question are the CAT temps and why is it running RICH at cruising speed.
Can you check these fuel trims at idle?
Let us know what values come up.
I'd like to see AF sensor voltages if you have them in your data list as well.
Thanks for providing the freeze frame.
You are running FAT.
Very rich thats why LT Fuel trims is reading on the negative side. (over -20% <--- this is whats partly triggering the P0101)
Meaning ECU is trying to LEAN it out.
But why isnt it triggering a RICH code?
Maybe the ECU can still compensate but triggers the P0101?
Mass Air Flow Rate = 26.5 g/s <-- hmmm
Can you check Baro pressure and MAF rate at idle?
Let me know your findings when you get a chance.
Engine load at 80% is a bit much at just cruising speed
I also dont understand CAT temps.
After CAT temps should be cooler than before CAT temps. <--- they are the same on your freeze frame.
Are you running w/out CATs?
Is your vehicle stock on is there anything aftermarket added?
The only things i have in question are the CAT temps and why is it running RICH at cruising speed.
Can you check these fuel trims at idle?
Let us know what values come up.
I'd like to see AF sensor voltages if you have them in your data list as well.
Thanks for providing the freeze frame.
Did you rest the ECU after the new MAF was installed? Disconnect the negative battery side for 30 minutes or so. After that the Long term fuel trims should wipe out. Once you do that see where the Long term fuel trims sit at with your scanner. Let it try to complete a drive cycle maybe it won't throw a code. Depending how fast the LTFTs creep up past the threshold
My car has wierd fuel trims in cold weather. At idle it will be around -13 bank 1 bank 2 will be at +1.3 - + 2.3. once fully warmed up while cruising it will be bank 1 short 0 long .8
Bank 2 short 0 long + 2.3 give or take. Said that once at idle again it will creep up back to bank1 long term +13 all others near 0.
At idle the MAF should be around 2.3 to 2.6 g/s at idle.
My car has wierd fuel trims in cold weather. At idle it will be around -13 bank 1 bank 2 will be at +1.3 - + 2.3. once fully warmed up while cruising it will be bank 1 short 0 long .8
Bank 2 short 0 long + 2.3 give or take. Said that once at idle again it will creep up back to bank1 long term +13 all others near 0.
At idle the MAF should be around 2.3 to 2.6 g/s at idle.
Short fuel trim are around +1.56 to -1.56 bank 1 and bank 2. Today was 7 degrees Celsius
800 rpm on idle
