LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P0016 To P0401 >> DTC P0107 or P0108 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. With the ignition OFF, disconnect the harness connector at the MAP sensor.
    2. IMPORTANT:
    • The test lamp is used to load the circuit and may not illuminate.
    • The MAP sensor 5-volt reference circuit is spliced to other components of the vehicle.
  2. With the ignition ON and the engine OFF, connect a test lamp between the MAP sensor 5-volt reference circuit and a good 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 an open, high resistance, or a short to ground. If the MAP sensor 5-volt reference circuit and connections tests normal, replace the ECM.
    • If the voltage is more than the specified range, test the circuit for a short to voltage. If the MAP sensor 5-volt reference circuit tests normal, replace the ECM.
  3. With the MAP sensor harness connector still disconnected, observe the MAP Sensor parameter for a value of less than 12 kPa with a scan tool.
    • If the MAP Sensor parameter is more than 12 kPa, test the MAP sensor signal circuit for a short to voltage. If the MAP sensor signal circuit tests normal, replace the ECM.
  4. Connect a 3-amp fused jumper wire between the MAP sensor 5-volt reference circuit and the signal circuit of the MAP sensor and verify the MAP sensor parameter is more than 103 kPa.
    • If the MAP Sensor parameter is less than 103 kPa, test the MAP sensor signal circuit for an open, high resistance, or a short to ground. If the MAP sensor signal circuit tests normal, replace the 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. Measure for a value of less than 5 ohms of resistance between the low reference circuit of the MAP sensor and a ground.
    • If the resistance is more than 5 ohms, test the circuit for an open or high resistance. If the MAP sensor low reference circuit tests normal, replace the ECM.
    • If the MAP sensor circuits test normal, replace the MAP sensor.
scientia non olet · About LEMON Manuals