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Component Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: You must perform the Circuit/System Testing before proceeding with the Component Testing.
  1. Ignition OFF, remove the SCIAP sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference terminal C of the sensor and a 5-volt reference.
  3. Install a jumper wire between the low reference terminal A of the sensor and ground.
  4. Install a jumper wire at the signal terminal B of the SCIAP sensor.
  5. Connect a DMM between the jumper wire from terminal B of the SCIAP sensor and ground.
  6. Ignition ON, with the J 23738-A  or J 35555  slowly apply vacuum to the sensor while monitoring the voltage on the DMM. See Special Tools . The voltage should vary between 4.9-0.4 volts, without any spikes or dropouts.
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