Troubleshooting
(continued)
CODE 3: High & Low Program Data Error (continued)
2. Using Factory Coolant Temperature Sensor (OEM) or Electric Water
Temperature Gauge
a. Sensor prole not compatible with current LOW/HIGH values.
Depending on the application a minimum spread of 10°to 15° may not
be sufcient. This is more prevalent with older factory water tempera-
ture gauges. The voltage difference between the HIGH and LOW
temperature settings must be .1 Volt or higher.
b. White wire not connected to proper wire on vehicle. Typically on a 2
wire coolant temp sensor, one wire will be a chassis ground while the
other will vary in voltage with temperature. The white wire must be
connected to the wire which varies in voltage.
c. Connection was made to a temperature SWITCH not a sensor. The
FAN-PWM will not function connected to a switch (such as our 185-TS)
that is used to turn on a relay or warning light. The sensor type must
be for a gauge or a coolant temp sensor for a fuel injection computer.
d. Wiring from the sensor to the gauge or computer is faulty. The white
wire is a passive input and it must be connected in parallel with the
original circuitry designed for that specic sensor.
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