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Component Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: You must perform the Circuit/System Testing in order to verify the integrity of the MAF sensor circuits before proceeding with the Component Testing.
  1. Ignition OFF, remove the MAP sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference 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 the signal terminal B of the MAP sensor.
  5. Connect a DMM between the jumper wire from 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. See Special Tools . The voltage should vary between 4.9-0.02 volts, without any spikes or dropouts.
    • If the voltage is erratic, replace the MAP sensor.
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