P0480
DTC P0480 Cooling Fan Relay 1 Control Circuit
Refer to Engine Controls Schematics.
Circuit Description
Output Driver Modules (ODM) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. ODMs have the capability of diagnosing each output circuit individually. DTC P0480 set indicates an improper voltage level has been detected on the output circuit which controls the Fan 1 Relay.
Conditions for Running the DTC
^ The ignition is ON.
^ The ignition voltage is between 9.0 and 18.0 volts.
Conditions for Setting the DTC
^ An improper voltage level has been detected on the output circuit which controls the low speed fans.
^ The above conditions present for at least 30 seconds.
Actions Taken When the DTC Sets
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.
Conditions for Clearing the MIL/DTC
^ The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.
Diagnostic Aids
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
^ Loosen terminal connection
- Use a corresponding mating terminal to test for proper tension.
- Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection.
^ Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault.
^ Imspect the powertrain control module (PCM) and engine grounds for clean and secure connections.
If the is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
1. The Powertrain OBD System Check prompts you to complete some basic tests and store the Failure Records data on the scan tool.
2. Listen for a click when the relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil feed side of the relay.
4. Verifies that the PCM is providing ground to the relay.
5. Tests if ground is constantly being applied to the relay.
12. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.
