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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
  2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and the signal circuit terminal 3.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  5. Ignition OFF, disconnect the harness connector at the EBCM.
  6. Test for infinite resistance between the signal circuit terminal 41 and ground.
    • If not the specified value, test the signal circuit for a short to ground.
  7. If all circuits test normal, test or replace the power brake booster vacuum sensor.
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