I need a wiring schematic for a 2005 chevy cobalt. it needs to include the mass air flow sensor wiring harness

Diagnostic Aids
Check for the following conditions:
• A skewed or stuck TP sensor. A problem with the TP sensor or TP sensor circuit can cause the VCM to incorrectly calculate the predicted mass air flow value. Observe the throttle angle with the throttle closed. If the throttle angle reading is not 0%, check for the following conditions:
- The throttle plate is sticking or excessive deposits on the throttle plate or the throttle bore
- The TP sensor signal circuit shorted to voltage
- A poor connection or high resistance in the TP sensor ground circuit.
• A misrouted harness. Inspect the MAF sensor harness in order to ensure that it is not routed too close to high voltage wires such as spark plug leads.
• A damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving the connectors and the wiring harnesses related to the MAF sensor. A change in the display indicates the location of the fault.
• A plugged intake air duct or dirty air filter element. A wide open throttle acceleration from a stop should cause the mass air flow displayed on a scan tool to increase from about 4-7 gm/s at idle to 100 gm/s or more at the time of the 1-2 shift. If not, check for a restriction.

Circuit Description
The mass air flow (MAF) sensor is an air flow meter. The control module supplies the MAF sensor a signal circuit. An ignition positive voltage circuit and a ground circuit are supplied to the MAF sensor by independent circuits. The MAF sensor heats a wire element, or grid, within the MAF sensor in order to maintain a calculated temperature. As inlet air flows across and cools the grid, the MAF sensor increases current flow to the grid in order to maintain the constant grid temperature. The MAF sensor converts the grid current flow into a frequency signal. The control module converts the MAF signal frequency into a grams per second value. During low air flow rates, such as at engine idle, the MAF sensor produces a low frequency signal. During high air flow rates, such as at wide open throttle-road load, the MAF sensor increases the frequency signal. The control module monitors the MAF sensor signal frequency in order to calculate the flow and mass of the air entering the engine.
The VCM monitors the MAF sensor air flow rate and compares this signal to a VCM calculated air flow rate. The calculated air flow is based on engine speed and barometric pressure. The VCM uses the MAP sensor in order to determine the barometric pressure when the ignition key is turned ON but before the engine is cranking or running. This DTC will be set if the MAF sensor signal airflow rate does not match the air flow rate calculated by the VCM.

When you disconnect the harness the computer defaults to factory programming and guesses at the mass of incoming air. I assume you had a MAF code and automatically replaced the sensor. But if there's a problem with the wiring harness OR you've got an air leak between the air filter box and the throttle body, it''ll run worse when plugged in. Check for cracks in the air intake duct.

hi Eric.
this link should help you out.
wiring schematics wiring diagram for 2005 chevy cobalt ignition coil pack...
if not try this one might help you find out.

wiring schematics wiring diagram for 2005 chevy cobalt ignition coil pack...

google this.

Chevrolet Cobalt 2005

Get your car fix right now :))

P0102 Chevrolet - Mass or Volume Air Flow Circuit Low Input

Read more: http://engine-codes.com/p0102_chevrolet.html#ixzz38p5k1ZD8

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

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.


Read more: http://engine-codes.com/p0102_chevrolet.html#ixzz38p5tpWZk

P0121 is for TPS sensor, clean your throttle body. Use a rag, toothbrush and carb cleaner. Get it clean. P0102 is for Mass air flow sensor. Try cleaning it first. No toothbrush use qtips on tiny wires. Be careful not to break wires. It's located between air filter and throttle body. Clear light and retest. If 102 returns , replace mass air flow sensor. Also test all wires at sensors. Wiggle and pull. Resolder as needed

Well you shouldn't pay to much attention to what some people say . Never use carb. cleaner to clean a mass air flow sensor , they make a special cleaner for mass air flow sensors . And you just spray the sensor an let it air dry ,then put it back together . And as far as dealer's not being able to find this ,i'm sure some may not . Just as any independent repair shop may not . I have thrity years experience at GM dealerships ,started at a Chevy dealer back in 1984 ,right out of a two year automotive technician program . Have worked at Cadillac , pontiac , GMC etc.....
Listening to others making guesses as to what the problem is ,mite fix the problem an then again it may not . There are a lot of electronic componets on your vehicle that could cause your problem , looking at sensor data on a capable scan tool is the correct way to find your problem .
007 Idle Speed Problems Scan Data for Idle

Should be inline usually in the ductwork between the throttle body and the air filter housing.

Code 12 is just a code telling you that you are in the diagnostic mode and it is working. Code 33 is a mass air flow error code. The computer is detecting mor air going into the engine then required at the detected rpm for more than 5 seconds. Could be caused by a faulty connection(wiring harness,ect) to a bad ECM(electronic control module) or MAF(mass air flow) sensor. Also the TPS(throttle position sensor) could be out of adjustment.