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Circuit/System Testing

    IMPORTANT: You must perform the circuit/system verification before proceeding with the circuit/system testing.
  1. Ignition OFF, disconnect the harness connector at the MAP sensor.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal and ground.
    • If greater than the specified range, test the low reference circuit for an open or high resistance. If the circuit tests normal, replace the control module.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground, open, or high resistance. If the circuit tests normal, replace the control module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.
  4. Verify the scan tool MAP Sensor parameter is less than 0.2 volt.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the control module.
  5. Install a 3A fused jumper wire between the signal circuit terminal and the 5-volt reference terminal. Verify the scan tool MAP Sensor parameter is greater than 200 kPa.
    • If less than the specified range, test the signal circuit for a short to ground, open, or high resistance. If the circuit tests normal, replace the control module.
  6. If all circuits test normal, test the MAP sensor. Refer to Component Testing
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