2000 Monte Carlo LS 3.4L - P0327 Code: Low Input Sensor Bank 1 - Diagnosis & Wiring Help
I own a 2000 Monte Carlo LS with a 3.4L engine. The car runs smoothly with no power loss, but the check engine light is on and I've been getting code P0327 — indicating a low input from the Knock Sensor (KS) on Bank 1. I replaced the knock sensor at NAPA, but the same P0327 code persists. I'm trying to figure out how to properly diagnose this issue: - How can I check the resistance of the knock sensor? - What steps should I take to test for open or short circuits in the wiring? - The sensor has only one wire — does that mean it only receives voltage from the PCM? If so, how is a signal sent back to the PCM if there's no return path? I'm looking for clear, accurate technical guidance on diagnosing this code. Any help would be greatly appreciated!
The single wire from the knock sensor carries a 5V DC reference voltage from the PCM and transmits the AC knock signal back to the PCM. The circuit is completed through a common ground connection between the sensor and the PCM. To test: disconnect the sensor, then measure for 5V at the connector pin coming from the PCM with respect to ground. If you read 0V, it could indicate an open or short in the wiring between the connector and the PCM, or that the PCM is not providing the reference voltage. Verify that the PCM itself is outputting a stable 5V signal.