Section 65 (Engine Controls [Pin Voltage Charts]): Introduction

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Pin voltage charts are used for diagnosing intermittent symptoms and faults that can not be resolved during self-diagnostics. Pin voltage tests ensure Powertrain Control Module (PCM) is receiving and transmitting proper voltage and other signals. PIN voltage charts may be helpful in determining if there is an open or short in wiring harness.

Parameter Identification (PID) values also check input and output signals to determine if PCM is receiving and transmitting proper signals. PID values are retrieved using New Generation Star (NGS), Worldwide Diagnostic System (WDS) or OBD-II compliant scan tool. See PID VALUE TESTING under TEST PROCEDURES.

Before performing pin voltage tests or checking PID values, ensure engine mechanical condition has been thoroughly inspected and self-diagnostics has been attempted. Technical Service Bulletins (TSBs) may also be helpful in correcting a hard to diagnose problem.