LETRIPP II XMS4A DIY MANUAL V2.1
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20
PE
RFECT POWER XMS4A – Engine Management System DIY MANUAL V2.1
XMS4
Pin 18 of 22 (Engine temp input)
Pin 14 of 22 (Ground)
Engine
temp
Wiring of Perfect Power
Engine temp sensor
Figure 8. Wiring of Perfect Power Engine Temp Sensor
If you are using another make of engine temp sensor, it must be of the NTC (negative
temperature coefficient) type.
15.3
AIR TEMP
Air temperature is important on boosted engines as the air temperature is raised considerably.
The air temp sensor relays to the XMS4A the temperature of the intake air (in volts) and the
XMS4A uses this information to compensate for different engine conditions. See section 26.
The air temp sensor is normally fitted to the inlet pipe before the throttle body.
XMS4
Pin 17 of 22 (Air temp input)
Air
temp
Pin 14 of 22 (Ground)
Wiring of Perfect Power
Air temp sensor
Figure 9. Wiring of Perfect Power Air Temp Sensor
NOTE: If you are using another make of air temp sensor, it must be of the NTC type.