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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0102 or P0103 (LUW) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the B75B Mass Air Flow/Intake Air Temperature Sensor.
  2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal 2 and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the ignition voltage circuit terminal 4 and ground.
    • If less than the specified range, test the ignition voltage circuit for a short to ground or an open/high resistance.
  4. 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 Engine Control Module.
    • 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.
  5. Ignition OFF, connect the red lead of the EL 38522  variable signal generator to the signal circuit terminal 5 at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
  6. Set the EL 38522  variable signal generator to the following specifications:
    • Signal switch to 5 V
    • Frequency switch to 5 kHz
    • Duty Cycle switch to normal
    7. NOTE:

    The engine may run rough and stall.

  7. Engine idling, observe the scan tool MAF Sensor Hz parameter. The scan tool MAF Sensor parameter should be between 4 950-5 025 Hz.
    • If not within the specified range, replace the K20 Engine Control Module.
  8. If the circuits test normal, replace the B75B Mass Air Flow/Intake Air Temperature Sensor.
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