Engine Controls - Pin Voltage Charts: Introduction

Pin voltage (value) charts are used for diagnosing intermittent symptoms and faults that are unable to be resolved during self-diagnostics. Pin voltage tests ensure Powertrain Control Module (PCM) is receiving and transmitting proper voltage and other signals. Before performing tests, ensure engine mechanical condition has been thoroughly inspected and self-diagnostics has been attempted. Available Technical Service Bulletins (TSBs) may also be helpful in correcting a hard to diagnose problem.