LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2004 >> Swift + >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P0480 or P0481 >> Test Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test Description

WARNING: This page is about a different car, the 2005 Suzuki Swift +, 2005 Pontiac Wave, and 2005 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 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.
  2. 8:  This step tests the control circuit for high resistance.
DTC P0480 or P0481

Step Action Values Yes No
Schematic Reference: Engine Cooling Schematics 
Connector End View Reference:  Cooling System Connector End Views  
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls in Engine Controls
2
  1. Turn ON the ignition, with the engine OFF.
  2. 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
  1. Turn OFF the ignition.
  2. Disconnect the affected relay.
  3. Turn ON the ignition, with the engine OFF.
  4. 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
  1. Turn ON the ignition, with the engine OFF.
  2. Probe the control circuit of the affected relay with a test lamp connected to battery positive.
  3. 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
  1. Turn OFF the ignition.
  2. Disconnect the MAIN relay in the underhood fuse block.
  3. 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 
  1. Turn ON the ignition, with the engine OFF.
    2. IMPORTANT: Use a test lamp that measures between 25-30 ohms for this test.
  2. Probe the control circuit of the affected relay with a test lamp connected to battery positive voltage.
  3. With a scan tool, command the affected relay ON.
  4. 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 in Wiring Systems.
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 in Wiring Systems.
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 and Repairing Connector Terminals in Wiring Systems.
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 and Repairing Connector Terminals in Wiring Systems.
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 in Wiring Systems.
Did you complete the repair?		 - Go to Step 16  -
14 Replace the affected relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the ECM.
Did you complete the replacement?		 - Go to Step 16  -
16
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. 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 System OK
scientia non olet · About LEMON Manuals