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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
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
• 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.
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?
Go to Step 4
Go to Step 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
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor
The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
Check for vacuum leaks...
If you have a crack or leak in your air intake downstream of the sensor, then the MAF will be sensing less air than the engine is actually receiving.
If the clamp on the throttle body happens to come loose and fall off, then the MAF will indicate almost no air being sucked through the intake, yet the engine will be sucking air directly from the engine compartment into the throttle body.
Also depending upon the year of the vehicle, you need to make sure you replaced the MAF sensor with the right type designed for your car.
1999 and earlier: use one type for throttle cable
2000 and later: e-gas electronic throttle
Drive the car a bit and see if the ECM resets the code faults. BTW, did you check the air filter?- sometimes if this is not working properly, the filter could allow debris or dust to collect on the MAF sensor...just a last minute thought
I hate to tell you this, but 80% of the vehicles out
there, have had their spark plugs under the ignition
coils for about 15 years,so you have some catching
You can only have have plugs in the sides of a cylinder
head where you can see them, or you can conclude you
have a hemi or top mount spark plugs & the coils are on top
Spark Plugs get replaced every 3 years
The coils you have, only last about 6 to 7 years,
then misfire & eventually ruin the exhaust converter
Your 2005 vehicle:
Should be due for the 3rd set of spark plugs
The 3rd or 4th trans & power steering fluid change (Never Flush)
MAF Sensor gets cleaned at least once a year
Every 3 years--Air Filter,Gas Filter,Cabin Filter
At 100,000 miles you replace the front Oxygen Sensors
At least twice a year you pick up a mechanic & go for a ride
You drive they look at scan tool data,fuel trim,O2,Maf etc
1. At the Mass Air Flow (MAF) sensor connector, backprobe the Gray (GY) wire at terminal #6 with the key on and the MAF sensor connected. Typical voltage will be about 2-3.5v depending on temperature.
2. If the voltage is above 4.5v (which is what the code P0113 indicates) check the voltage on the Gray/Red (GY/RD) wire at terminal #1 of the MAF sensor connector. The voltage on the GY/RD should be less than about 0.1v.
3. If the GY/RD wire shows less than 0.1v and the voltage on the GY wire is above 4.5v, inspect the connections at the MAF sensor connector. If OK, replace the MAF sensor for the open Intake Air Temperature (IAT) Sensor.
4. If the voltage on the GY/RD wire shows above 0.1v, locate and repair the high resistance between the MAF sensor and pin #91 of the Powertrain Control Module (PCM) connector.
5. If the voltage on the GY wire is not above 4.5v but the scanner shows -40 F on the data stream, check the voltage at pin 39 of the PCM. If the voltage at the PCM is above 4.5v, locate and repair the high resistance or open circuit in the GY wire between the PCM and MAF sensor connector