Accumulating PCM Data

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PCM data can be accumulated in a number of ways. Gather as much data as possible when the malfunction is occurring to prevent misdiagnosis. Data should be accumulated during different operating conditions and based on the customer description of the intermittent fault. Reference the known good data values located in CONTROL SYSTEM DIAGNOSTIC SHEET REFERENCE . This requires recording data in 4 conditions for comparison: 1) Key On Engine Off (KOEO), 2) Hot Idle, 3) 48 km/h (30 mph), and 4) 89 km/h (55 mph). Acquisition of PCM PID data using a diagnostic tool is one of the easiest ways to gather information.

For information on the functions of your diagnostic tool, refer to the manufacturer's manual for diagnostic tool instructions.

Below is a list of the functions available:

Selecting and viewing PIDs
Storing PIDs
Recording measurements along with PIDs
Playback of stored PIDs
Peripheral inputs