Neutral Start Switch (Nsw); A/T Neutral Relay - Kia Sorento 2003 Technical Highlights

Section 5 • Transmission—Sensors & Switches

Neutral Start Switch (NSW)

Electronic
Control Parts
The Neutral Start Switch (NSW) sends the auto-
and Their
matic transmission's shift lever position to TCM.
Operation
• The NSW only allows the engine to start in "P"
and "N".
The neutral start switch, which is also called an
inhibitor switch, sends the shift position information
to the TCM. To start an engine, the shift lever should
be located in the N or P range.
In the case of a switch malfunction or switch open
or short:
• If no signal is detected, the TCM electrically
controls the shift control solenoid valves accord-
ing to the shift pattern. However, hydraulic pres-
sure and engaged components are controlled by
the manual valve location which is aligned with
the shift lever. According to the location of the
manual valve, the hydraulic connection inside the
valve body operates relevant parts.
Automatic transaxle vehicles have an A/T neutral
A/T Neutral
relay to detect the shift condition from "Auto Mode"
Relay
to "Low Mode" (TOD) or 4H to 4L mode (EST).
Due to the characteristics of the Transfer Case Con-
trol Module (TCCM), the 'N' signal (battery 12 volt)
from the inhibitor switch cannot switch directly.
revised version 3
4
For example, if the L range is selected but there is
no position signal coming from an inhibitor switch,
the TCM recognizes this as the D range. It controls
the ON/OFF combination of the shift control so-
lenoid valves No. 1 and No. 2 according to the D
range shift pattern. Without the signal from the L
range, the transmission follows a D range shift pat-
tern up to the second gear. The car transmission can-
not be shifted up to the third and fourth gears.