opkamber.blogg.se - Duramax lb7 mass air flow sensor problems

If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle See: Diagnostic Trouble Code Descriptions.

See: Testing and Inspection\Component Tests and General Diagnostics Refer to Checking Aftermarket Accessories.

Verify that any electrical aftermarket devices are properly connected and grounded.

For an intermittent problem, visually and physically inspect the exhaust gas recirculation (EGR) valve for a possible binding or sticking in the open position.

This increase should be from 6-8 g/s at idle to greater than 380 g/s at the time of the 1-2 shift.

A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly.

The driver information center (DIC) or indicator may display reduced engine power.

The ECM detects that the MAF sensor is greater than 527 g/s for greater than 3 seconds. The ECM detects that the MAF sensor is less than 3.6 g/s for greater than 3 seconds.

This DTC runs continuously within the enabling conditions.

The above conditions are met for greater than 3 seconds.

The engine speed is between 500-3,100 RPM.

The engine is running for greater than 2 seconds.

During Rich Idle the EGR valve is commanded ON, and a lower frequency and g/s value will be indicated on the scan tool. When engine coolant temperatures reach 60☌ (140☏) the ECM commands a Rich Idle mode.

The frequency varies in a range depending on engine coolant temperature (ECT) sensor 1 of approximately 2,300 Hertz at idle to near 9,000 Hertz at maximum engine load. The sensor uses the voltage to produce a frequency based signal on the inlet airflow through the sensor bore. The ECM applies 5 volts to the MAF sensor on the MAF sensor signal circuit. A large quantity of air entering the engine indicates an acceleration or high load condition. A small quantity of air entering the engine indicates a deceleration or idle condition. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. The MAF sensor is an air flow meter that measures the amount of air entering the engine. The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor.