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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
  2. Ignition OFF for 60 seconds, test for less than 11 ohms 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 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5-volt reference circuit for an open/high resistance. If the circuit tests normal, replace the replace the EBCM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to B+. If the circuit tests normal, replace the EBCM.
  4. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and the signal circuit terminal 1.
    • 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 B+. If the circuit tests normal, replace the EBCM.
  5. Ignition OFF, disconnect the harness connector at the EBCM.
  6. Ignition OFF, test for infinite resistance between the signal circuit terminal 1 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 brake booster vacuum sensor.
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