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Circuit/System Testing

  1. Verify the integrity of the air induction system by inspecting for the following conditions:
    • Any damaged components
    • Loose or improper installation
    • Improperly routed vacuum hoses
    • Any vacuum leak
    • Any type of restriction
    • MAP sensor seal that is missing or damaged
  2. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .
  3. Ignition OFF, disconnect the B74 MAP harness connector at the B74 MAP sensor.
  4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. 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 K20 ECM.
  5. Service Mode active, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. Verify the scan tool MAP Sensor parameter is less than 2 psi.
    • If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  7. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 15 psi.
    • 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 K20 ECM.
  8. If all circuits test normal, test or replace the MAP sensor.
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