DTC P0481
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detection condition | Trouble area |
|---|---|
|
P0481: Fan 2 Control Circuit Any of the following conditions is met.
•Radiator cooling fan relay No. 2 drive circuit is open. (1 D/C detection logic)•Radiator cooling fan relay No. 2 drive circuit is shorted to power supply. •Radiator cooling fan relay No. 2 drive circuit is shorted to ground. •Temperature of radiator cooling fan relay No. 2 drive circuit is out of specified range. |
•Radiator cooling fan motor relay No.2 (coil side) and/or its circuit
•ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | D2: | Radiator cooling fan ground circuit |
| A1: | Radiator cooling fan relay No.1 power supply circuit (coil side) | D3: | Radiator cooling sub fan power supply circuit |
| A2: | Radiator cooling fan relay No.1 power supply circuit (switch side) | D4: | Radiator cooling sub fan ground circuit |
| A3: | Radiator cooling fan relay No.1 drive circuit | 1. | ECM |
| B1: | Radiator cooling fan relay No.2 power supply circuit (coil side) | 2. | Radiator cooling fan motor |
| B2: | Radiator cooling fan relay No.2 drive circuit | 3. | Radiator cooling sub fan motor |
| B3: | Radiator cooling fan relay No.2 ground circuit | 4. | Radiator cooling fan relay No.1 |
| C1: | Radiator cooling fan relay No.3 power supply circuit (coil side) | 5. | Radiator cooling fan relay No.2 |
| C2: | Radiator cooling fan relay No.3 power supply circuit (switch side) | 6. | Radiator cooling fan relay No.3 |
| C3: | Radiator cooling fan relay No.3 drive circuit | 7. | “RDTR” fuse |
| D1: | Radiator cooling fan power supply circuit | 8. | “RDTR2” fuse |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
Radiator cooling fan relay No.2 power supply circuit (coil side) and radiator cooling fan relay No.2 drive circuit check
1)Check “B1” and “B2” circuits according to Step 9 – 11 of Radiator Cooling Fan Operation Check:D16AA.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
Radiator cooling fan relay No.2 check
1)Check radiator cooling fan relay No.2.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace radiator cooling fan relays No.2.
|