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_ P0135 - HO2S Sensor During testing the Short to VPWR in - wiring. On vehicles where the wheel speed sensor is an integral part of the hub and wheel bearing assembly, the entire hub must be replaced if the sensor is bad. Turn ON the ignition leaving the engine OFF. You can do this with a Scan Tool or a Lab Scope. Use scan tool to isolate one cylinder at a time. Note: An incomplete or improperly performed MAF Sensor Relearn Procedure may set the following Diagnostic Trouble Codes (DTC): P0401, P0402, P0171, P0172 and/or 0V circuit from the MAF sensor to the PCM to control the MAF sensor reset signal. readout must be performed using the impulse counter scan tool. Actually, your scan tool changes the value to a readable measure, all the ECM sees is voltage and resistance in number values and manages the drivetrain accordingly based on maps in the ROM and RAM. P0102 - Mass Air Flow (MAF) Circuit Low Input The MAF sensor circuit is monitored by the PCM for low air flow (or voltage) input through the comprehensive component monitor (CCM). A faulty airflow sensor is very common in many cars (e. A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. It is located in the section: Engine / Engine Controls - 5. Dirty air filter Exhaust leaks or Boost leaks, you can usually hear a boost leak as a high pitched squeal under load. Graph the sensor with an advanced scan tool. Before buying a MAF sensor, try cleaning it with a specialized spray cleaner, like CRC 05110 made for MAF sensors, as these often get considerable carbon build up from the emission system, especially at idle. The mass air flow (MAF) sensor is an air flow meter.There are many names for this condition (limp home mod.

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Capture the movie or screen on the Scan Tool and return to the shop to enter the peak RPM and MAF values into the VE calculator along with intake air temperature, altitude, and engine displacement. This test is almost but not exactly the same for all types of MAF Sensors. If all circuits test normal, test or replace the MAF/IAT sensor. Before we jump into the diagnostic, let's take a look at how the MAF sensor works so the procedure makes sense to you.

A scan tool comes in handy but you won't need it to use the testing info in this article.

The frequency will vary within a range of around 2000 Hertz at idle to near 10,000 Hertz at maximum engine load.

The MAF or mass airflow sensor is an essential part of a fuel-injected engine.

If your scan tool can display calculated engine load, look at the value to see if the load is low at

The MAF sensor produces a frequency signal which can be monitored using a scan tool.

Your datastream reading during WOT needs to be recorded at the same timeframe as the highest RPM was reached. This is displayed on the scan tool over a range of some 3 to 255.