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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Powertrain Diagnostic Procedures - Diesel) >> Diagnostic Information And Procedures >> DRIVEABILITY - Diesel - Diagnostic Tests >> P0480-Fan 1 Control Circuit Open Circuit; P0480-Fan 1 Control Circuit Short To Ground >> Diagnostic Procedure

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.
DIAGNOSTIC PROCEDURES - P0480-FAN 1 CONTROL CIRCUIT OPEN CIRCUIT

TEST ACTION APPLICABILITY
1
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.With the DRB, actuate the Low Speed Radiator Fan Relay.Does the Radiator Fan cycle on and off?Yes --> Go To 2No --> Go To 3		 All
2
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Test Complete.		 All
3 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit.
Did the test light illuminate brightly?
Yes --> Go To 4
No --> Repair the ASD Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
4 Turn the ignition off.
Install a substitute relay in place of the Low Speed Radiator Fan Relay.
Turn the ignition on.
With the DRB, actuate the Low Speed Rad Fan Relay.
Does the Radiator Fan cycle on and off?
Yes --> Replace the Low Speed Radiator Fan Relay.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 5		 All
5 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Low Speed Radiator Fan Control circuit.
Is the resistance above 1000 ohms?
Yes --> Go To 6
No --> Repair the Low Speed Radiator Fan Control circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
6 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Disconnect the ECM harness connectors.
Measure the resistance of the Low Speed Radiator Fan Control circuit.
Is the resistance below 10.0 ohms?
Yes --> Replace and program the Engine Control Module in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Repair the Low Speed Radiator Fan Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
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