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Circuit/System Testing

NOTE: All electrical components and accessories must be turned OFF and allowed to power down.
  1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
  2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 1 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 ECM.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool MAP Sensor parameter is less than 10 kPa.
    • If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5V reference circuit terminal 2. 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 or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, test or replace the MAP sensor.
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