Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Cadillac >> 2007 >> SRX 4.6 A, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - DTC P0010 To DTC P0336 >> DTC P0107 or P0108 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAP sensor.
  2. Ignition OFF, allow sufficient time for the control module to power down. Measure for less than 5 ohms of resistance between the low reference circuit terminal A of the connector and a good ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
    • If less than the specified range, test the 5-volt reference circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify the scan tool MAP sensor voltage parameter is less than 0.2 volt.
    • If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3-amp fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP sensor parameter is greater than 4.9 volts.
    • If less than the specified range, test the sensor signal circuit for a short to ground, open, high resistance.
  6. If all circuits test normal, test or replace the MAP sensor.
scientia non olet · About Mike's Workshop Manuals