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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P1400 To P2444 >> DTC P2433 >> Circuit/System Testing
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Circuit/System Testing

  1. With the ignition ON and the engine OFF, observe the AIR Pressure Sensor parameter with a scan tool while manipulating all related wiring and connectors.
    • If manipulation does affect the AIR Pressure Sensor parameter then repair the harness or connector.
  2. With the ignition ON, the engine OFF, and the solenoid valve disconnected, inspect for an AIR Pressure Sensor parameter reading on a scan tool of approximately 40 kPa.
    • If more than approximately 40 kPa, test the signal circuit for a short to voltage. If the circuit test normal, replace the control module.
  3. With the ignition ON, the engine OFF, the solenoid valve disconnected, a 300 ohm fixed resistor, an appropriate length of secondary ignition wire may be adequate, installed between the 5-volt reference circuit and the low reference circuit, and a fused jumper connected from the signal circuit to the low reference circuit at the fixed resistor, inspect for a pressure sensor parameter reading on a scan tool of 0 volts.
    • If more than 0 volts, test the low reference circuit for an open or high resistance. If the circuit test normal, replace the control module.
  4. If all circuits and the control module test normal, replace the solenoid valve.
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