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Circuit/System Testing

  1. Verify the following conditions do not exist:
    • A dirty, restricted, or deteriorating air filter element
    • A leaking, loose, or cracked PCV pipe or seal
    • A restricted or collapsed air intake duct
    • A misaligned, leaking, or damaged air intake duct
    • Any objects blocking the air inlet probe of the B75B mass air flow/intake air temperature sensor
    • Any contamination or debris on the sensing elements in the probe of the B75B mass air flow/intake air temperature sensor
    • A cracked, damaged, or leaking B75B mass air flow/intake air temperature sensor housing
    • Any water intrusion in the induction system
    • Any snow or ice build-up at the air cleaner or B75B mass air flow/intake air temperature sensor in cold climates
    • Any vacuum leak
    • A B74 MAP sensor seal that is leaking, missing, or damaged
    • Q38 Throttle body for dirt, debris, and coking. Refer to Throttle Body Inspection and Cleaning .
    • A damaged Q38 throttle body blade or shaft
    • Missing, restricted, or leaking exhaust components. Refer to Symptoms - Engine Exhaust .
    • If you find any of the above conditions, repair as necessary.
  2. Ignition OFF, disconnect the harness connector at the B75B mass air flow/intake air temperature sensor.
  3. Service Mode active, test for 4.8-5.2 V between the signal circuit terminal 5 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Verify that a test lamp illuminates between the ignition voltage circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test or replace the components on the ignition voltage circuit.
  5. Connect the test lamp between the MAF control circuit terminal 2 and the ignition voltage circuit terminal 4.
  6. Service Mode active, command the MAF Sensor Supply Voltage ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  7. Ignition OFF, connect the red lead of the J 38522  to the signal circuit terminal 5 at the harness connector. Connect the battery voltage supply to B+, and the black lead to ground. See Special Tools .
  8. Set the J 38522  to the following specifications. See Special Tools .
    • Signal switch to 5 V
    • Frequency switch to 5 KHz
    • Duty Cycle switch to Normal
    9. NOTE: The engine may run rough and stall.
  9. Ignition ON, engine running, observe the scan tool MAF Sensor Hz parameter. The parameter should be between 4,950 and 5,025 Hz.
    • If not within the specified range, replace the K20 ECM.
  10. If all circuits test normal, test or replace the B75B mass air flow/intake air temperature sensor.
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