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Circuit/System Testing

IMPORTANT: It is recommend that the defective components be replaced, and not the complete brake master cylinder assembly.
  1. Ignition OFF, disconnect the harness connector at the SWPS.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for less than 1 ohm of resistance 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.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 7 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the fuse is OK, replace the HVAC relay 87.
  5. Test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
    • If less than the specified range, 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 the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  6. Test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and the signal terminal 6.
    • 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.
  7. Reconnect the SWPS.
  8. Disconnect the EBCM C2 harness connector.
  9. Ignition OFF, test for infinite resistance between the signal circuit pin 39 and ground.
    • If less than the specified range, test the signal circuit for a short to ground.
  10. Ignition ON, test for an ignition voltage pulse between ground and the signal A circuit terminal 23 and signal B circuit terminal 22 while turning the steering wheel.
    • If not the specified value, test the signal circuits for a short to voltage, short to ground or an open/high resistance. If the circuit tests normal, replace the SWPS.
  11. Position the wheels straight and the steering wheel within 10 degrees of center.
  12. Test for ignition voltage between the marker pulse signal circuit terminal 8 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the SWPS.
  13. Center the front wheels and steering wheel. Observe the scan tool Analog Steering Position Sensor data parameter for less than 180° or greater than -180°.
  14. If not the specified value replace the SWPS.
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