DTC P0481: Cooling Fan Relay 2 Control Circuit: Troubleshooting
TROUBLESHOOTING CHART
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Perform an On-Board Diagnostic (OBD II) System Check. Is the system check complete? |
- | Go to Step 2 | Go to On-Board Diagnostic (OBD II) System Check |
| 2 |
Does the voltage the specified value? |
0 V | Go to Step 4 | Go to Step 3 |
| 3 | Repair for a short to battery in the wire between the relay connector terminal 86 and the ECM connector terminal E34. Is the repair complete? |
- | Go to Step 16 | - |
| 4 | Measure the resistance between the relay terminal 85 and 86. Does the resistance measure the specified value? |
0 Ω | Go to Step 5 | Go to Step 6 |
| 5 | Replace the High speed cooling fan relay. Is the replacement complete? |
- | Go to Step 16 | - |
| 6 |
Does the resistance the specified value? |
- | Go to Step 7 | Go to Step 8 |
| 7 | Replace the cooling fan control relay. Is the replacement complete? |
- | Go to Step 16 | - |
| 8 | Check for an open or a short to ground in the wire between the high speed cooling fan relay connector terminal 86 and the ECM connector terminal E34. Is the problem found? |
- | Go to Step 10 | Go to Step 9 |
| 9 | Repair for a open or a short to ground in the wire between the cooling fan control relay connector terminal 86 and the ECM connector terminal E34. Is the repair complete? |
- | Go to Step 10 | Go to Step 11 |
| 10 | Repair for a open or a short to ground in the wire. Is the repair complete? |
- | Go to Step 16 | - |
| 11 | Connect the test light between the high speed cooling fan relay connector terminal 30 and ground. Is the test light illuminate? |
- | Go to Step 12 | Go to Step 13 |
| 12 | Check for a poor or faulty connection at the ECM connector. Is the problem found? |
- | Go to Step 14 | Go to Step 13 |
| 13 | Check for a poor or faulty connection between the relay connector terminal 30 and battery negative. Is the problem found? |
- | Go to Step 14 | Go to Step 15 |
| 14 | Repair the connection as needed. Is the repair complete? |
- | Go to Step 16 | - |
| 15 | Replace the ECM. Is the replacement complete? |
- | Go to Step 17 | - |
| 16 |
Does the scan tool indicate that this diagnostic ran and passed? |
- | Go to Step 16 | Go to Step 2 |
| 17 | Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed? |
- | Go to applicable DTC table | System OK |