Code Enable Criteria

Conditions for running DTC:

• Engine coolant temperature is greater than or equal to 176°F (80°C).
• Engine speed is 2000 RPM or greater for at least 2 minutes.

Conditions for setting DTC:

• Resistor voltage is less than 2.5 volts for 5 seconds with heater off.
• Resistor voltage is greater than .3 volt for 5 seconds with heater on.
• Either conditions is present for 5 seconds.