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Circuit/System Testing

6 Cylinder Engine RPO LLT

  1. Ignition OFF, disconnect the harness connector at the B37B Engine Oil Pressure Sensor.
  2. Test for less than 10 Ω between the low reference circuit terminal 3 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 K20 Engine Control Module.
  3. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 2 and ground.
    • If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
  5. Test for greater than 500 kΩ between the signal circuit terminal 1 and ground.
    • If less than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the B37B Engine Oil Pressure Sensor.
  6. Ignition ON, test for less than 0.3 V between the signal circuit terminal 1 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the B37B Engine Oil Pressure Sensor.
  7. If all circuits test normal, replace the K20 Engine Control Module.

8 Cylinder Engine RPO L99 or LS3

  1. Ignition OFF, disconnect the harness connector at the B37B Engine Oil Pressure Sensor.
  2. Test for less than 10 Ω between the low reference circuit terminal A 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 K20 Engine Control Module.
  3. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal B and ground.
    • If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
  5. Test for greater than 500 kΩ between the signal circuit terminal C and ground.
    • If less than the specified range, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the B37B Engine Oil Pressure Sensor.
  6. Ignition ON, test for less than 0.3 V between the signal circuit terminal C and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the B37B Engine Oil Pressure Sensor.
  7. If all circuits test normal, replace the K20 Engine Control Module.
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