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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Saturn Ion 3 and 2006 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.
  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 5 volts between the 5-volt reference circuit and ground.
    • If more than 5 volts then test the 5-volt reference circuit for a short to voltage or a faulty control module.
    • If less than 5 volts then test the 5-volt reference circuit for high resistance, a short to ground, or a faulty control module.
  3. With the ignition ON, the engine OFF, and the solenoid valve disconnected, measure for 0 volts between the low reference circuit and ground.
    • If more than 0 volts then test the low reference circuit for a short to voltage or a faulty control module.
  4. 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 0 volts.
    • If more than 0 volts then test the signal circuit for a short to voltage or a faulty control module.
  5. With the ignition ON, the engine OFF, the solenoid valve disconnected, and a 3-amp fused jumper wire connected between the signal and 5-volt reference circuits, inspect for an AIR Pressure Sensor parameter reading on a scan tool of 5 volts.
    • If less than 5 volts then test the signal circuit for high resistance, a short to ground, or a faulty 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 5-volt reference circuit at the fixed resistor, observe an AIR pressure sensor parameter reading on a scan tool of 5 volts.
    • If less than 5 volts then test the 5-volt reference circuit and the signal circuit for high resistance or a faulty control module.
  7. 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, inspect for a pressure sensor parameter reading on a scan tool of 0 volts.
    • If more than 0 volts then test the low reference circuit for high resistance or a faulty control module.
  8. If all circuits and the control module test OK then replace the solenoid valve.
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