Accumulating PCM Data: Notes

PCM data can be accumulated in a number of ways. This includes circuit measurements with a digital multimeter (DMM) or diagnostic tool PID data. Acquisition of PCM parameter identification (PID) data using a diagnostic tool is one of the easiest ways to gather information. Gather as much data as possible when the concern is occurring to prevent improper diagnosis. Data should be accumulated during different operating conditions and based on the customer description of the intermittent concern. Compare this data with the known good data values located in TYPICAL DIAGNOSTIC REFERENCE VALUES . This will require recording data in 4 conditions for comparison: 1) KOEO, 2) Hot Idle, 3) 48 km/h (30 mph), and 4) 89 km/h (55 mph).