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Circuit/System Testing

  1. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Any damaged components
    • Loose or improper installation
    • An air flow restriction
    • Any vacuum leak
    • Improperly routed vacuum hoses
    • In cold climates, inspect for any snow or ice buildup
    • Verify that restrictions do not exist in the MAP sensor port or vacuum source.
  2. Ignition OFF for 90 s, disconnect the harness connector at the B74 MAP sensor.
  3. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 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 ECM.
  4. Ignition ON, 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.
  5. Verify the scan tool MAP Sensor parameter is less than 1 kPa (0.1 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.
  6. 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 127 kPa (1.5 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.
  7. If the circuits test normal, test or replace the B74 MAP sensor.
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