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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P0016 To P0401 >> DTC P0106 >> Circuit/System Testing
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Circuit/System Testing

  1. Turn ON the ignition, with the engine OFF. Disconnect the MAP sensor harness connector.
    2. IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
    IMPORTANT: The MAP sensor 5-volt reference circuit is spliced to other components of the vehicle.
  2. Connect a test lamp between the MAP sensor 5-volt reference circuit and a ground. With a DMM, measure for a voltage range of 4.8-5.2 volts from the MAP sensor 5-volt reference circuit to a ground.
    • If the voltage is less than the specified range, test the circuit for a high resistance or a faulty ECM.
    • If the voltage is more than the specified range, test the circuit for a short to voltage or a faulty ECM.
  3. With the MAP sensor still disconnected, use the scan tool to observe the MAP Sensor parameter for a value of less than 12 kPa.
    • If the MAP Sensor parameter is more than 12 kPa, test the MAP sensor signal circuit for a short to voltage or a faulty ECM.
  4. Connect a 3-amp fused jumper wire between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit. With a scan tool, observe the MAP Sensor parameter for a value of more than 103 kPa.
    • If the MAP Sensor parameter is less than 103 kPa, test the MAP sensor signal circuit for high resistance or a faulty ECM.
  5. Turn OFF the ignition, and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement. With a DMM, measure for a resistance value of less than 5 ohms between the low reference circuit of the MAP sensor and a good ground.
    • If the resistance is more than 5 ohms, test the circuit for high resistance or a faulty ECM.
  6. If the MAP sensor circuits test normal, replace the MAP sensor.
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