DTC Troubleshooting
P0482 DIAGNOSIS PROCEDURE
| Step |
Action |
YES |
NO |
| 1 |
Was "Engine and Emission Control System Check" performed? |
Go to Step 2. |
Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK:J24B . |
| 2 |
Radiator cooling fan relay No. 3 power supply circuit (coil side) check
- Turn OFF ignition switch and remove radiator cooling fan relay No. 3.
- Check for proper terminal connection to cooling fan relay No. 3 connector.
- If connections are OK, check that voltage between radiator cooling fan relay No. 3 power supply circuit (coil side) (A3) and vehicle body ground is battery voltage with ignition switch in ON position.
Is it in good condition? |
Go to Step 3. |
Repair or replace defective wire harness. |
| 3 |
Radiator cooling fan relay No. 3 check
- Check radiator cooling fan relay No. 3, see RADIATOR COOLING FAN RELAY INSPECTION
.
Is it in good condition? |
Go to Step 4. |
Replace radiator cooling fan relay No. 3. |
| 4 |
Radiator cooling fan relay No. 3 drive circuit check
- Turn OFF ignition switch and disconnect connectors from ECM.
- Check that radiator cooling fan relay No. 3 drive circuit (B3) is as follows.
- Wiring harness resistance of radiator cooling fan relay No. 3 drive circuit is less than 3 Ω.
- Insulation resistance between radiator cooling fan relay No. 3 drive circuit and vehicle body ground is infinity.
- Insulation resistance of wire harness is infinity between radiator cooling fan relay No. 3 drive circuit terminal and each terminal at radiator cooling fan relay No. 3 connector.
- Circuit voltage of radiator cooling fan relay No. 3 drive circuit is 0 - 1 V with ignition switch in ON position.
Is it in good condition? |
Substitute a known-good ECM and recheck. |
Repair or replace defective wire harness. |