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Home >> Chevrolet >> 2010 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0008 To DTC P0191 >> DTC P0100-P0103 (w/o LF1) >> Circuit/System Testing
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Circuit/System Testing

  1. Verify that DTCs P0685 or P0689 or P0690 are not set.
  2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
  3. Ignition OFF, test for less than 5 Ω between the ground circuit terminal C and the battery ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
    4. CAUTION: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur due to excessive current draw.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal B and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  5. Test for 4.8-5.2 V between the signal circuit terminal A and the ground circuit terminal C.
    • If less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit/connections test normal, replace the K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
  6. Ignition OFF, connect the red lead of the J 38522  to the signal circuit terminal 5 at the B75B MAF/IAT sensor harness connector. See Special Tools . Connect the battery voltage supply to B+, and ground the black lead.
  7. Set the J 38522  Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal. See Special Tools .
  8. Ignition ON, observe the scan tool MAF Sensor frequency parameter. The parameter should be between 4, 950-5, 025 Hz.
    • If the parameter is not within the specified range, replace the K20 ECM.
  9. If all circuits/connections test normal, replace the B75B MAF/IAT sensor.
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