2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2092

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2092

Typical Scan Tool Data

Circuit/System Description

The engine cooling fan system consists of 2 electric cooling fans and 3 fan relays. The cooling fan relays are arranged in a series/parallel (S/P)

configuration. This allows the engine control module (ECM) to operate both fans together at low or high speeds using 2 fan control circuits. The

cooling fans receive positive voltage from the cooling fan relays, which receive battery positive voltage from the underhood fuse block. The

cooling fans are supplied a ground at G100 and G101.

Conditions for Running the DTC

* The system voltage is between 9-18 volts.

* The engine speed is greater than 400 RPM.

* DTCs P0480 and P0481 run continuously when the conditions above are met.

Conditions for Setting the DTC

* The commanded state of the ECM driver and the actual state of the control circuit do not match.

* The condition exists for greater than 5 seconds.

Action Taken When the DTC Sets

DTCs P0480 and P0481 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0480 and P0481 are Type B DTCs.

Diagnostic Aids

* The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the

fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.

* The scan tool cooling fan output control operates as follows:

- Fan Relay 1 operates both fans at a low speed

- Fan Relay 2 and 3 operates one fan at high speed