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Circuit/System Testing

  1. Turn OFF the ignition. Disconnect the longitudinal accelerometer harness connector. Turn ON the ignition. Verify voltage between 4.4 and 5.6 on the LNG rate sensor terminal B 5-volt reference circuit.
    • If voltage is below 5.4, test for an open or a short to ground on the LNG rate sensor circuit. If the circuit tests normal, replace the EBCM assembly.
  2. Turn OFF the ignition. At the longitudinal accelerometer harness connector, connect a test lamp between the LNG low reference circuit terminal D and battery positive voltage. Verify the test lamp illuminates.
    • If the test lamp does not illuminate check for an open in the LGN low reference circuit. If the circuit tests normal, replace the EBCM assembly.
  3. Connect a 3-amp fused jumper wire between the LNG rate sensor 5-volt reference circuit terminal B and the longitudinal accelerometer signal circuit terminal A. Turn ON the ignition and observe the longitudinal accelerometer parameter.
    • If the scan tool displays greater than 1.5g, replace the longitudinal position sensor.
    • If the scan tool displays less than 1.5g, test for an open or short to ground on the longitudinal accelerometer signal circuit. If the circuit tests normal, replace the EBCM assembly.
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