13.17
ELECTRICAL
CLEAN FIRE ELECTRICAL
IQ THROTTLE POSITION SENSOR
When the sensor is inoperative or disconnected the system will
switch to a LIMP HOME" mode. Limp Home mode reduces
performance to a default value and monitors other sensors.
IQ TEMPERATURE LIGHT
The TEMP light (A) is controlled by the CDI using water
temperature input from the water temp sensor (B), throttle
position input (TPS) and RPM input. The water temp sensor is
a thermistor. As the temperature increases the resistance
decreases. Each input has thresholds programmed into the CDI
for when to illuminate the TEMP light according to coolant
temp, throttle position (TPS) and engine speed (RPM).
For example, the TEMP light will come on at idle (under 2000
RPM, 0% throttle) and coolant temperature of 230_F (110_C).
Timing retard initiates at 176_F and a TPS of over 80-100%.
For more severe conditions, the engine fail-safe is turned on at
high TPS input and high temps.
LAMP CIRCUIT TEST
1. Ground the Black/White wire from the Temperature light.
2. Run the machine, and light should be on.
THERMISTOR SENSOR TEST
At room temperature 68_ F (20_ C) the Thermistor should
read 2190 to 2575 Ω. See chart below for other temperature
resistances.
Table 13-10: IQ Temperature Sensor
Resistance Range
TEMPERATURE _F (_C) Ω RESISTANCE RANGE
68 (20) 2189 - 2675
149 (65) 455 - 566
203 (95) 197 - 240
239 (115) 120 - 147
275 (135) 77 - 94
CAUTION
IF ATTEMPTING TO HEAT THE SENSOR, HEAT ONLY IN A WA-
TER BATH. NEVER SUBJECT THE SENSOR TO AN OPEN
FLAME TO ATTEMPT TO CLOSE THE CONTACTS AS SENSOR
DAMAGE MAY RESULT.
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