SAE INTERNATIONAL J1979™ FEB2017 Page 16 of 143
3. TERMS, DEFINITIONS, SYMBOLS, AND ABBREVIATED TERMS
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in SAE J1930, ISO 14229-2, ISO 14230-2, and ISO
15765-2 and the following apply.
3.1.1 ABSOLUTE THROTTLE POSITION SENSOR
Value intended to represent the throttle opening
NOTE: For systems where the output is proportional to the input voltage, this value is the percent of maximum input signal.
For systems where the output is inversely proportional to the input voltage, this value is 100% minus the percent of
maximum input signal. Throttle position at idle usually indicates greater than 0%, and throttle position at wide open
throttle usually indicates less than 100%.
3.1.2 BANK
Specific group of cylinders sharing a common control sensor, bank 1 always containing cylinder number 1, bank 2 the
opposite bank.
NOTE: If there is only one bank, bank #1 DTCs are used, and the word bank may be omitted. With a single “bank” system
utilizing multiple sensors, bank #1 DTCs are used identifying the sensors as #1, #2, and #3 in order as they move
further away from the cylinder.
3.1.3 BASE FUEL SCHEDULE
The fuel calibration schedule programmed into the Powertrain Control Module or PROM when manufactured or when
updated by some off-board source, prior to any learned on-board correction.
3.1.4 CALCULATED LOAD VALUE
For spark ignition vehicles, typically an indication of the current airflow divided by peak airflow at wide open throttle as a
function of rpm, where airflow is corrected for altitude and ambient temperature. Both spark ignition and compression ignition
vehicles can use an alternate definition that substitutes engine torque in place of airflow in the calculation.
NOTE: This definition provides a unit-less number, and provides the service technician with an indication of the percent
engine capacity that is being used.
3.1.5 CLIENT
Function that is part of the tester and that makes use of the diagnostic services.
NOTE: A tester normally makes use of other functions such as data base management, specific interpretation,
man-machine interface.
3.1.6 CONTINUOUS MONITORING
Sampling at a rate no less than two samples per second. If for control purposes a computer input is sampled less frequently,
the signal of the component may instead be evaluated each time sampling occurs.
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