Component Testing
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
- Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
- Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
- Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
- Install a jumper wire to the MAP sensor signal circuit terminal 3.
- Connect a DMM between the jumper wire from the MAP sensor signal circuit terminal 3 and ground.
- Install the J-35555
to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 V without any spikes or dropouts.
- If the voltage is not within the specified range or is erratic, replace the MAP sensor.