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Home >> Buick >> 2008 >> Lucerne Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P0016 To DTC P0336 >> DTC P0106 >> Component Testing >> Erratic Signal Test

Erratic Signal Test

  1. Ignition OFF, remove the MAP sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
  3. Install a jumper wire between the low reference terminal A of the MAP sensor and ground.
  4. Install a jumper wire at terminal B of the MAP sensor.
  5. Connect a DMM between the jumper wire from the terminal B of the MAP sensor and ground.
  6. Ignition ON, with the J 23738-A  or J 35555  , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 4.9-0.2 volts without any spikes or dropouts.
    • If the voltage is erratic, replace the MAP sensor.
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