DTC P0480: Cooling Fan Relay 1 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 85 and the ECM connector terminal C50. Is the repair complete? |
- | Go to Step 12 | - |
| 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 low speed cooling fan relay. Is the replacement complete? |
- | Go to Step 12 | - |
| 6 | Check for an open or a short to ground in the wire between the relay connector terminal 85 and the ECM connector terminal C50. Is the problem found? |
- | Go to Step 7 | Go to Step 8 |
| 7 | Repair for a open or a short to ground in the wire between the relay connector terminal 85 and the ECM connector terminal C50. Is the replacement complete? |
- | Go to Step 12 | - |
| 8 | Connect the test light between the relay connector terminal 30 and ground. Is the test light illuminate? |
- | Go to Step 10 | Go to Step 11 |
| 9 |
Is the problem found? |
- | Go to Step 10 | Go to Step 11 |
| 10 | Repair the connection as needed. Is the repair complete? |
- | Go to Step 12 | - |
| 11 | Replace the ECM. Is the replacement complete? |
- | Go to Step 13 | - |
| 12 |
Does the scan tool indicate that this diagnostic ran and passed? |
- | Go to Step 13 | Go to Step 2 |
| 13 | Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed? |
- | Go to applicable DTC table | System OK |