Component Testing

Testing with EL-38522-A

NOTE:

In-correct diagnosis will result if Circuit/System Testing is not completed before performing the following test.

1. 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+
2. 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)
3. Engine idling.
4. Verify the scan tool MAF Sensor parameter is between 4, 950-5, 050 Hz.
   • If not between 4, 950-5, 050 Hz. 
   1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
   2. 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. 
5. Test or replace the B75C Multifunction Intake Air sensor.