Test Description

The numbers below refer to the step numbers on the diagnostic table.

6: A test lamp that remains illuminated indicates a short to ground on the control circuit. A test lamp that does not illuminate indicates an open or short to voltage on the control circuit.
8: This step tests the control circuit for high resistance.

DTC P0480 or P0481

Step	Action	Values	Yes	No
Schematic Reference: Engine Cooling Schematics (Notchback) or Engine Cooling Schematics (Hatchback) Connector End View Reference: Cooling System Connector End Views (Notchback) or Cooling System Connector End Views (Hatchback)
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. With a scan tool, command the Fan Low Speed ON and OFF. Does the relay turn ON and OFF with each command?	-	Go to Step 3	Go to Step 4
3	With a scan tool, command the Fan High Speed ON and OFF. Do the relay turn ON and OFF with each command?	-	Go to Diagnostic Aids	Go to Step 4
4	Turn OFF the ignition. Disconnect the affected relay. Turn ON the ignition, with the engine OFF. Probe the ignition 1 voltage circuit of the affected relay coil with a test lamp connected to a good ground. Does the test lamp illuminate?	-	Go to Step 5	Go to Step 13
5	Turn ON the ignition, with the engine OFF. Probe the control circuit of the affected relay with a test lamp connected to battery positive. With a scan tool, command the affected relay ON and OFF. Does the test lamp turn ON and OFF?	-	Go to Step 7	Go to Step 6
6	Does the test lamp remain illuminated?	-	Go to Step 9	Go to Step 10
7	Turn OFF the ignition. Disconnect the MAIN relay in the underhood fuse block. Measure the resistance of the ignition 1 voltage circuit of the affected relay coil from the MAIN relay terminal to the affected relay terminal. Is the resistance less than the specified value?	3 Ω	Go to Step 8	Go to Step 13
8	Turn ON the ignition, with the engine OFF. IMPORTANT: Use a test lamp that measures between 25-30 ohms for this test. Probe the control circuit of the affected relay with a test lamp connected to battery positive voltage. With a scan tool, command the affected relay ON. Measure the voltage from the probe of the test lamp to a good ground with a DMM. Is the voltage less than the specified value?	2.5 V	Go to Step 11	Go to Step 10
9	Test the control circuit of the affected relay for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 16	Go to Step 12
10	Test the control circuit of the affected relay for one of the following conditions: An open A short to voltage High resistance Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 16	Go to Step 12
11	Test for shorted terminals and poor connections at the affected relay. Refer to Testing for Intermittent Conditions and Poor Connections . Did you find and correct the condition?	-	Go to Step 16	Go to Step 14
12	Test for shorted terminals and poor connections at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections . Did you find and correct the condition?	-	Go to Step 16	Go to Step 15
13	Repair the open, short to ground, or high resistance on the ignition 1 voltage circuit. Refer to Wiring Repairs . Did you complete the repair?	-	Go to Step 16	-
14	Replace the affected relay. Refer to Relay Replacement (Within an Electrical Center) . Did you complete the replacement?	-	Go to Step 16	-
15	Replace the ECM. Did you complete the replacement?	-	Go to Step 16	-
16	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 17
17	Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK