Engin e size? 3.1 or 3.8? This works for either anyway...
Mass Airflow (MAF) Sensor A malfunction in the MAF sensor circuit will set a related diagnostic trouble code. For testing procedures, see Code P0101 in the TESTS W/CODES - 3.8L article in this section. If driveability problems exist, MAF sensor failure is suspected and no Code P0101 is present, disconnect MAF sensor connector. If driveability improves, replace MAF sensor.
Here's the flow chart I have.
Dont forget to check for a bad MAP, unplug it and see if conditions improve.
CODE P0101, MAF SENSOR CIRCUIT The Mass Air Flow (MAF) sensor measures the flow of air which passes through it in a given time. PCM uses this information to monitor the operating condition of the engine for fuel delivery calculations. A large quantity of air movement indicates acceleration, while a small quantity indicates deceleration or idle. MAF sensor produces a frequency signal, which cannot be easily measured. Diagnose sensor using procedures on this chart. Code P0101 will set when the following conditions are present. Ã Engine is running. Ã No MAF signal for over 4 seconds. With Code P0101 set, PCM will use a default value for airflow based on throttle position, IAC motor position and engine speed. PCM will illuminate Malfunction Indicator Light (MIL). 1. This step checks to see if PCM recognizes a problem. 2. Voltage reading at sensor harness terminal "A" of less than 4 volts or greater than 6 volts indicates a fault in circuit No. 492 (Yellow wire), or poor connection. 3. Verifies that both ignition feed voltage and a good ground circuit are available. Diagnostic Aids An intermittent may be caused by a poor connection, mis-routed harness, rubbed through wire insulation or a wire broken inside the insulation. Check for: Ã Poor Connection At PCM pin: Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Ã Mis-Routed Harness: Inspect MAF sensor harness to ensure it is not too close to high voltage wires, such as spark plug wires. Ã Damaged Harness: Inspect harness for damage. If harness appears okay, observe Tech-1 while moving related connectors and wiring harness. A change in display would indicate intermittent fault location. Ã Plugged Air Intake Filter: A wide-open throttle acceleration from a stop should cause MAF reading on Tech-1 to range from approximately 4-7 grams per second at idle to 100 or greater at time of 1-2 shift. If not, check for restriction. NOTE: Test numbers refer to numbers on diagnostic chart.
Sunday, September 27th, 2009 AT 7:32 AM