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Circuit/System Testing

IMPORTANT: It is recommend that Component Testing is performed before Circuit Testing when diagnosing the power brake booster actuator.
  1. Ignition OFF, disconnect the 2 way harness connector at the power brake booster actuator.
  2. Test for less than 25.0 ohm of resistance between the ground circuit terminal 5 and ground.
    • If greater than 25.0 ohm, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 5.
  4. Command the Active Brake Booster to ON and OFF with a scan tool.
    • If the test lamp remains OFF during the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the EBCM.
    • If the test lamp is always ON, test the control circuits for a short to battery positive. If the circuit tests normal, replace the electronic brake control module (EBCM).
  5. If all circuits test normal, test or replace the vacuum brake booster assembly.
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