Trouble Diagnosis (Specification Value): Description

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

The Specification (SP) value indicates the tolerance of the value that is displayed in "DATA MONITOR (SPEC)" mode of CONSULT-II during normal operation of the ECS. When the value in "DATA MONITOR (SPEC)" mode is within the SP value, the ECS is confirmed OK. When the value in "DATA MONITOR (SPEC)" mode is NOT within the SP value, the ECS may have one or more malfunctions.

The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the MIL. The SP value will be displayed for the following 3 items:

B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correction).
A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle).
MAS A/F SE-B1 (The signal voltage of the MAF sensor).