How do you check a 98 Pontiac transport PO336 code?

To check a PO336 code on a 1998 Pontiac Transport, start by using an OBD-II scanner to confirm the code and read any related codes. The PO336 code indicates a problem with the crankshaft position sensor circuit, so inspect the sensor and its wiring for any signs of damage or corrosion. Additionally, test the sensor's resistance and voltage output to ensure it's functioning correctly. If necessary, replace the sensor or repair any wiring issues to resolve the code.