Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0481-COOLING FAN NO. 2 CONTROL CIRCUIT DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. With the DRBIII®, actuate the High Speed Radiator Fan Relay. Is the High Speed Radiator Fan Relay operating? Yes --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 2 |
All |
| 2 | Turn the ignition off. Remove the High Speed Radiator Fan Relay from the PDC. Measure the resistance of the High Speed Radiator Fan Relay between the (F1) Fused Ignition Switch Output terminal and the (N112) High Speed Rad Fan Relay Control terminal. Is the resistance between 60 to 85 ohms? Yes --> Go To 3 No --> Replace the High Speed Radiator Fan Relay. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 3 | Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (F1) Fused Ignition Switch Output circuit at the Relay connector in the PDC. Does the test light illuminate brightly? Yes --> Go To 4 No --> Repair the open or short to ground in the (F1) Fused Ignition Output. Inspect the related fuse and repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 4 | Using a 12-volt test light connected to ground probe the (A16) Fused B+ circuit in the PDC. Does the test light illuminate brightly? Yes --> Go To 5 No --> Repair the open or short to ground (A16) Fused B+ circuit. Inspect the related fuse and repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 5 | Turn the ignition off. Disconnect the C3 PCM harness connector. Measure the resistance of the (N112) High Speed Rad Fan Relay Control circuit from the PDC to the PCM harness connector. Is the resistance below 5.0 ohms? Yes --> Go To 6 No --> Repair the open in the (N112) High Speed Rad Fan Relay Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 6 | Measure the resistance between ground and the (N112) High Speed Rad Fan Relay Control circuit in the PDC. Is the resistance below 5.0 ohms? Yes --> Repair the short to ground in the (N112) High Speed Rad Fan Relay Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 7 |
All |
| 7 |
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |