Component Testing
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
Testing with EL-38522-A
- Ignition OFF, connect the leads of the EL-38522-A
Variable Signal Generator as listed below:
- Red lead to the signal circuit terminal 6 at the harness connector
- Black leads to ground
- Battery voltage supply lead to B+
- Set the EL-38522-A
Variable Signal Generator to the specifications listed below:
- Signal switch to 5 V
- Frequency switch to 5 kHz
- Duty Cycle switch to 50 % (Normal)
- Engine idling.
- Verify the scan tool MAF Sensor parameter is between 4, 950-5, 050 Hz.
- If not between 4, 950-5, 050 Hz.
- Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
- Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the K20 Engine Control Module.
- If between 4, 950-5, 050 Hz.
- Test or replace the B75C Multifunction Intake Air sensor.
NOTE:
In-correct diagnosis will result if Circuit/System Testing is not completed before performing the following test.