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Page Title: Table 156. The following conditions will turn the Fan ON for Illustration 66
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209
TM 9-2320-312-24-2
Troubleshooting Section
Table 156
The following conditions will turn the Fan ON for Illustration 66.
Circuit
Condition that will turn the Fan ON
Coolant temperature sensor
The coolant temperature is greater than 96 C (205 F).
A diagnostic code for the coolant temperature sensor is
active.
Exhaust brake
The "Fan with Exhaust Brake ON" parameter is programmed
to "YES".
The exhaust brake is on at least two seconds.
OEM installed A/C control unit
The "A/C Switch Fan On-Time" parameter is programmed
to a value above 0 seconds.
The A/C control unit circuit is open.
The external timer is counting or the ECM timer is counting.
The engine rpm is greater than 2750 rpm.
The engine is cranking. The engine has been running two
seconds or the ignition key is on the ON position and the
engine off.
Air inlet temperature sensor
The temperature in the air inlet manifold is greater than 87 C
(189 F).
The temperature in the air inlet manifold is greater than 72 C
(162 F) while the boost pressure is greater than 70 kPa
(10 psi).
OEM installed manual fan override switch
There is an open circuit in the switch or the switch is on.
OEM installed cooling fan air solenoid valve
Open solenoid circuit
Circuit breaker for the cooling fan
Tripped breaker or open circuit
Dedicated PTO on/off switch
The "PTO Configuration" is programmed.
The "PTO Activates Cooling Fan" is programmed.
There is a short circuit in the switch or the switch is on.
g00766689
Illustration 67
This schematic represents the on/off fan with a normally closed relay and the A/C high pressure switch that is not connected to the ECM input.

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