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Replaced the MAF and done a throttle body service (clean). P0102 keeps coming back and vehicle stalls while in drive. RPM's fluctuate for a second or two when 1st start up then levels out.
Code p 0102 refers to mass air flow (MAF) sensor/volume air flow(VAF) sensor--low input===causes ---wiring short to ground--MAF/VAF sensor---ecm
check the wiring to the unit--plug connection
That has all been done. Verified integrity of connection, pins, wiring in circuit. Found that some one had installed IAC valve backwards before I bought this vehicle. Installed properly. Code went away. Now I have a code for "Fuel Vapor Recovery". I'm thinking my next problem is the gas capThat has all been done. Verified integrity of connection, pins, wiring in circuit. Found that some one had installed IAC valve backwards before I bought this vehicle. Installed properly. Code went away. Now I have a code for "Fuel Vapor Recovery". I'm thinking my next problem is the gas cap
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If you are in Limp Mode, the scan tool will tell you why?
If the battery light is flashing on and off, you have a battery issue, a wiring issue or you have an alternator charging issue.
All your faults can be diagnosed cheaply by an auto electrician using a Professional Grade Scan Tool COMPUTER. This is not a normal $125 scan tool. They cost between $3.5k and $5,000. Employing an electrician in far cheaper than guessing parts to swap out, test always, then replace.
G105 ground 105 - G105
(CKT 450, CKT 451) In the engine harness, on the LR side of the cylinder head
DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency
Circuit Description
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 to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition. The MAF sensor has the following circuits:
• An ignition 1 voltage circuit
• A ground circuit
• A signal circuit
The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage to produce a frequency based on the inlet air flow through the sensor bore. The frequency varies within a range of near 2,000 Hertz at idle to near 10,000 Hertz at maximum engine load. If the PCM detects the frequency signal is less than the possible range of a correctly operating MAF sensor DTC P0102 sets
Diagnostic Aids
• Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
• Inspect for any contamination or debris on the sensing elements of the MAF sensor.
• A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 3-10 g/s at idle to 150 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
• A high resistance of 15 ohms or more on the ground circuit or the ignition 1 circuit of the MAF sensor may cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.
2
Start the engine.
Observe the Mass Air Flow (MAF) Sensor parameter with a scan tool.
Is the MAF Sensor parameter less than the specified value?
1,200 Hz
Go to Step 4
Go to Step 3
3
Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
--
Go to Step 4
Go to Diagnostic Aids
Check for applicable trouble codes. Some of the national brand auto stores will check codes for free.
You may need to clean the throttle body and clean those small passages. With a high idle block off mouth of throttle body, should have a big effect on the idle? There are several issues that could cause idle to act up. Vacuum leak--maf and or map sensor. Don't replace anything unless testing points you in that direction.
Use a voltmeter to check the DC voltage to the maf by probing the back of the connector on the pink and black wires. Have someone start the car while you watch the meter. It should show the alternator voltage of 13.5-14.5 vdc, and it should stay constant. Watch it until the engine dies. If the car passes this test, switch from the pink wire to the yellow wire and do the same thing. The voltage on the yellow wire will be lower, but it should not change much until the engine dies.
If the car fails either of these tests, there is some problem with the wiring.
If the car passes these tests, the circuit is probably ok.
That means something is probably blocking airflow. Remove the air filter and look/feel upstream. Check the inlet duct on the front of the car for blockage. Maybe a plastic bag got stuck in there...
Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes: A code P0102 may mean that one or more of the following has happened: The MAF may be disconnected, or a wiring connection may be bad The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). The MAF sensor may be faulty The vehicle computer may be faulty (very rare)
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. Inspect for any air leaks near the MAF sensor. Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor. Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) Replace the MAF sensor.
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Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. Other MAF sensor circuit DTC trouble codes are P0101, P0102, P0103, and P0104.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes: A code P0100 may mean that one or more of the following has happened: * The MAF may be disconnected, or a wiring connection may be bad * The MAF sensor may be faulty
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Unplug and reconnect the MAF wiring harness * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor
The EPC (Electronic Pedal Control) is the "fly by wire" system that
controls the throttle, it took the place of the cable that went from the
gas pedal to the throttle body on VW. If this light is on and there is
also a P0102, MAF (Mass Air Flow) related code stored in the vehicle's
computer, the EPC may be caused indirectly from a faulty MAF. If the
EPC is on and there is no other codes stored, it could be a faulty
electronic throttle body or need to be re-programmed. The vehicle's
computer must recognoze the throttle body so when replacing it with new
or used it will need to be programmed at the dealer. Recently I replaced
a MAF (a common problem on VW's) on a VW Golf and when I cleared the
code the EPC went off as well.
While the engine is running try tapping the mAF sensor with a wooden handle to see if that causes the engine to stumble or shut-off if it doesn't I would just clean it to see if that would solve your problem. You should also check and clean your throttle plate and throottle bore any carbon build up around the edges blocks off Idle air and can cause a stall condition.
If there is a Auto Zone around your area, have them scan the Explorer for any DTC codes since it's fee of charge. But in the mean time buy a can of MAF cleaner and follow the instructions and also buy a can of Trottle body cleaner and follow the instructions on the can. Clean the MAF and the Throttle body, also try to get the Idle Air Control falve cleaned too which is on the throttle body. So use up the whole can of Throttle body cleaner and it would not hurt to use two cans. Once everything is cleaned that should fix the problem, the other thing to that would cause your poor idle and stalling is a bad or dirty EGR valve which can be cleaned with Carburetor cleaner since it's stronger then the Throttle body cleaner, just remove the EGR and spray the Carbon build away and place back in place. Note: the Carb cleaner is to strong for the gaskets used on the throttle body so don't use it on the throttle body. Good luck and this should help get your Explorer running 100% soon.
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