DTC P0482:00

Cooling fan relay No.2 and No.3 control circuit malfunction

DETECTION CONDITION

• The cooling fan relay No.2 and No.3 control voltage is less than the specification or cooling fan relay No.2 and No.3 control current is the specification or more for a continuous 5 s relative to the PCM control signal.

Diagnostic support note

• This is a continuous monitor (other).

• The check engine light does not illuminate.

• FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• Cooling fan relay No.2 and/or No.3 malfunction

• Short to ground or open circuit in cooling fan relay No.2 and/or No.3 power supply circuit

• Short to ground in wiring harness between the following terminals:

• ENGINE3 15 A fuse—Cooling fan relay No.2 terminal A

• ENGINE3 15 A fuse—Cooling fan relay No.3 terminal A

• ENGINE3 15 A fuse malfunction

• Open circuit in wiring harness between the following terminals:

• Main relay terminal C—Cooling fan relay No.2 terminal A

• Main relay terminal C—Cooling fan relay No.3 terminal A

• Short to ground in wiring harness between the following terminals:

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

• PCM connector or terminals malfunction

• Short to power supply in wiring harness between the following terminals:

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

• Open circuit in wiring harness between the following terminals:

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

• PCM malfunction

STEP

INSPECTION

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

• Switch the ignition off.

• Remove the cooling fan relay No.2 and No.3.

• Inspect the cooling fan relay No.2 and No.3.

  (See RELAY INSPECTION.)

• Is there any malfunction?

Yes

Replace the cooling fan relay No.2 and/or No.3, then go to Step 8.

No

Go to the next step.

3

• Cooling fan relay No.2 and No.3 are removed.

• Switch the ignition ON (engine off).

• Measure the voltage at the following terminals (wiring harness-side):

• Cooling fan relay No.2 terminal A

• Cooling fan relay No.3 terminal A

• Is the voltage B+?

Yes

Go to the next step.

No

Inspect the ENGINE3 15 A fuse.

• If the fuse is blown out:

• Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• ENGINE3 15 A fuse—Cooling fan relay No.2 terminal A

• ENGINE3 15 A fuse—Cooling fan relay No.3 terminal A

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

• Replace the fuse.

• If the fuse is damaged:

• Replace the fuse.

• If the fuse is normal:

• Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Main relay terminal C—Cooling fan relay No.2 terminal A

• Main relay terminal C—Cooling fan relay No.3 terminal A

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to Step 8.

4

• Cooling fan relay No.2 and No.3 are removed.

• Switch the ignition off.

• Inspect for continuity between the following terminals (wiring harness-side) and body ground:

• Cooling fan relay No.2 terminal E

• Cooling fan relay No.3 terminal E

• Is there continuity?

Yes

If the short to ground circuit could be detected in the wiring harness:

• Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

If the short to ground circuit could not be detected in the wiring harness:

• Replace the PCM (short to ground in the PCM internal circuit).

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

Go to Step 8.

No

Go to the next step.

5

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 8.

No

Go to the next step.

6

• Cooling fan relay No.2 and No.3 are removed.

• Verify that the PCM connector is disconnected.

• Switch the ignition ON (engine off).

• Measure the voltage at the following terminals (wiring harness-side):

• Cooling fan relay No.2 terminal E

• Cooling fan relay No.3 terminal E

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

• Repair or replace the malfunctioning part.

• Repair or replace the wiring harness which has a short to power supply.

Go to Step 8.

7

• Cooling fan relay No.2 and No.3 are removed.

• Verify that the PCM connector is disconnected.

• Switch the ignition off.

• Inspect for continuity between the following terminals (wiring harness-side):

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Cooling fan relay No.2 terminal E—PCM terminal 2AV

• Cooling fan relay No.3 terminal E—PCM terminal 2AV

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to the next step.

8

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].)

• Perform the KOEO or KOER self test.

  (See KOEO/KOER SELF TEST [SKYACTIV-G 2.5].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

Go to the next step.

No

Go to the next step.

9

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SKYACTIV-G 2.5].)

No

DTC troubleshooting completed.