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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 P2430 >> 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, measure for a voltage range of 4.8-5.2 volts between the 5-volt reference circuit and a good ground.
    • If less than 4.8 volts then test the 5-volt reference circuit for high resistance, If the circuit test normal, replace the control module.
  3. 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.
  4. With the ignition ON, the engine OFF, the solenoid valve disconnected, and a 3-amp fused jumper installed between the signal and 5-volt reference circuits, inspect for an AIR Pressure Sensor parameter reading on a scan tool of approximately 140 kPa
    • If less than approximately 140 kPa, test the signal circuit for an open, or a short to ground. If the circuit test normal, replace the control module.
  5. 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 5-volt reference circuit at the fixed resistor, observe an AIR pressure sensor parameter reading on a scan tool of 5.0 volts.
    • If less than 5 volts, test the 5-volt reference circuit and the signal circuit for high resistance, If the circuit test normal, replace the control module.
  6. 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 3-amp fused jumper connected from the signal circuit to the low reference circuit at the fixed resistor, observe for a pressure sensor parameter reading on a scan tool of 0 volts.
    • If more than 0 volts, test the low reference circuit for high resistance, If the circuit test normal, replace the control module.
  7. If all circuits and the control module test normal, replace the solenoid valve.
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