Engine Controls - PID Values, Pcm Connector Views And Terminal Identification: Introduction

The Parameter Identification (PID) charts contain all the engine related parameters that are available on the scan tool. The list is arranged in alphabetical order. A parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together. Use the PID charts only after the Diagnostic System Check - Engine Controls has been completed, no DTCs were noted, and you have determined the on-board diagnostics are functioning properly. See the following:

On 2.2L, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L SONOMA & S10 PICKUP article.
On 4.3L, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP article.

On all models, scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Typical Scan Data values represent values that would be seen on a normally running engine. Technical Service Bulletins (TSBs) may also be helpful in correcting a hard to diagnose problem.

NOTE: Do not use a scan tool that displays faulty data. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and in unnecessary parts replacement.

If all the PID values are within the typical range and a symptom still exists, diagnosis by symptom may help find the fault. See TROUBLE SHOOTING - NO CODES - 2.2L SONOMA & S10 PICKUP article or TROUBLE SHOOTING - NO CODES - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP article.