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HOMESERVICE MANUALSCHEVROLET2008HHR SS, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C1100CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR SS, Standard

Circuit/System Testing

2008 Chevrolet HHR SS, StandardSECTION Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
  2. Test for less than 1.0 ohm of resistance between the low reference circuit terminal and ground.
    • If greater than 1.0 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 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 and the signal circuit terminal.
    • 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 3 A fused jumper wire at the signal circuit terminal. Toggle the jumper wire between the low reference circuit terminal and the 5-volt reference circuit terminal. 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.