Dodge Ram Truck 1500-2500-3500. Manual — part 900
P0480-COOLING FAN 1 CONTROL CIRCUIT
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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
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P0480-COOLING FAN 1 CONTROL CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
•
Set Condition:
An open or shorted circuit is detected in the radiator fan relay control circuit. One Trip Fault. Three good trips
to turn off the MIL.
Possible Causes
(A16) FUSED B+ CIRCUITS
(K173) COOOLING FAN NO.1 RELAY CONTROL CIRCUIT OPEN
(K173) COOOLING FAN NO.1 RELAY CONTROL CIRCUIT SHORTED TO GROUND
LOW SPEED RADIATOR FAN RELAY
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
COOLING FAN RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the Cooling Fan Relay.
Is the Cooling Fan Relay operating?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
(A16) FUSED B+ CIRCUITS
Turn the ignition off.
Remove the Cooling Fan Relay.
Using a 12-volt test light connected to ground, probe the (A16) Fused
B+ circuits.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (A16) Fused B+
circuits. Inspect the related fuse and repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 523
P0480-COOLING FAN 1 CONTROL CIRCUIT (CONTINUED)
3.
COOOLING FAN RELAY RESISTANCE
Measure the resistance of the Cooling Fan Relay Coil.
Is the resistance between 60 to 80 ohms?
Yes
>> Go To 4
No
>> Replace the Cooling Fan Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(K173) COOLING FAN NO.1 CONTROL CIRCUIT OPEN
Disconnect the C3 PCM harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (K173) Cooling Fan No.1 Relay Control
circuit from the Relay to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (K173) Cooing Fan No.1 Relay
Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
5.
(K173) COOLING FAN NO.1 CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K173) Cooling Fan
No.1 Relay Control circuit at the Relay connection.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K173) Cooling Fan No.1
Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0480-COOLING FAN 1 CONTROL CIRCUIT (CONTINUED)
6.
PCM
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.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 525
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