Table 160. The following conditions will turn the Fan ON for Illustration 70

213

TM 9-2320-312-24-2

Troubleshooting Section

Table 160

The following conditions will turn the Fan ON for Illustration 70.

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 high pressure switch

The "A/C Switch Fan On-Time" parameter is programmed

to a value above 0 seconds.

The switch circuit is open or the switch is on.

The external timer is counting or the ECM timer is counting.

The engine rpm is less 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 a short circuit in the switch or the switch is on.

OEM installed cooling fan air solenoid valve

The solenoid is energized.

OEM installed Cooling Fan Relay

Open circuit in coil side of relay

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.