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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. 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. Test for less than 3.0 ohm of resistance between the low reference circuit terminal A and ground.
    • If greater than 3.0 ohm, 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 volts between the 5-volt reference circuit terminal B and ground.
    • If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  4. Test for 4.5-5.3 volts between the 5-volt reference circuit terminal B and the signal circuit terminal C.
    • 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 specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  5. Install a 3A fused jumper wire at the signal circuit terminal C. Toggle the jumper wire between the low reference circuit terminal and the 5-volt reference circuit terminal B. Verify the scan tool Brake Pressure Sensor Input parameter toggles between 0.2-3.2 volts.
    • If the specified parameter, does not toggle between the minimum and maximum values test the signal circuit for a short to voltage, short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
  6. If all circuits test normal, test or replace the brake booster vacuum sensor.
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