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Home >> Hummer >> 2009 >> H3T Alpha >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 5.3L - DTC P0016 To DTC P0308 >> DTC P0107 or P0108 >> Component Testing
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Component Testing

IMPORTANT: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
  1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference circuit pin C and the corresponding terminal of the MAP sensor.
  3. Install a jumper wire between the low reference circuit pin A of the MAP sensor and ground.
  4. Install a jumper wire to the MAP sensor signal circuit pin B.
  5. Connect a DMM between the jumper wire from the MAP sensor signal circuit pin B and ground.
  6. Install the J-35555  to the MAP sensor vacuum port. See Special Tools . Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts without any spikes or dropouts.
    • If the voltage is not within the specified range or is erratic, replace the MAP sensor.
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