Tracker Off-Road 500S Service Manual page 115

Coolant (COOLANT)
WT591
Display: Engine coolant temperature as measured by the
ECT sensor.
DTC: P0116, P0117, P0118, P0119
Usage: Monitor coolant temperature to verify the follow-
ing:
1. ECT sensor signal.
2. High Temperature indicator (on @ 230° F.)
3. Thermostat opening @ approximately 180° F, indi-
cated by a momentary drop or pause in the rising
temperature reading.
4. Fan ON @ 194° F, OFF @ 185° F:
A. fan motor
B. fan relay
C. fan fuse
D. wiring connections
5. High Temperature Rev Limiter 4500 RPM @ 230° F.
Inlet Air Temperature (INTAKE)
WT592
Display: Inlet air temperature in Fahrenheit or Celsius.
DTC: P0112, P0113, P0114
Usage: Verify correct output of IAT sensor.
 NOTE: After engine has been running, IAT read-
ings will be higher than outside air temperature due
to engine and engine compartment heat as well as
intake manifold heating.
MAP (AIR PRESS)
WT602
Display: MAP in millibars and in./Hg.
DTC: P0107, P0108
Usage: Verify barometric pressure signal correct.
NOTE: Local barometric pressure is given in in./Hg

(inches of mercury) and millibars. The gauge should display
approximately 965 millibars at 970 ft. above sea level. This
number will not change when the engine is started. How-
ever, the value is being observed internally in the ECM.
Idle Step Control (ISC)
WT542
Display: ISC position
DTC: P0508, P0509
Usage: Verify correct ISC position.
TPS (TPS)
WT539
Display: TPS position (0% closed, 95-100% WOT).
DTC: P0121, P0122, P0123
Usage: Verify TPS signal and adjust throttle cable.
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