Diagnostic Instructions
Circuit/System Description
The engine control module (ECM) commands the fans ON in high speed or low speed. In low speed, the fans are configured in series. In high speed, the fans are configured in parallel.
In low speed operation, the ECM applies ground to the coil side of the low fan speed relay, which is the cool/fan 1 relay 28. Voltage is applied directly to the left cooling fan through the switch side of the low fan speed relay. The right
fan is connected in series to the left fan through the de-energized series/parallel relay, which is cool/fan SER/PAR relay 29, so that both fans operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the low speed fan relay, the series/parallel relay, and the high speed fan relay, which is the cool/fan 2 relay 30. Voltage is applied directly to the right cooling fan
through the switch side of the high speed fan relay. The left cooling fan obtains voltage through the low speed fan relay and ground through the series/parallel relay.
When the ECM is commanding a fan relay ON, the voltage of the control circuit should be low, near 0 volts. When the ECM is commanding a fan relay OFF, the voltage of the control circuit should be high, near battery voltage.
Reference Information
Schematic Reference
Engine Cooling Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cooling Fan Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Verification
- Verify that the following DTCs are not set: P0480, P0481.
- Verify with a scan tool that the ECM is not commanding fan relay activation.
- Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
- Ignition ON, observe that the fans are not activated.
Circuit/System Testing
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition OFF, leave the series/parallel relay, which is Cool Fan SER/PAR Relay 29, in place while disconnecting the other relays.
- Ignition ON, observe that the fans are not activated.
⇒ | If the fans are not activated, replace the faulty relay. |
⇒ | If a fan is activated, test the fan voltage supply circuits for a short to voltage. |
Repair Instructions
Repair Verification
- Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
- Ignition ON, observe that the fan is not activated.