Chrysler Repair: 300m fans, radiator fan, 2002 chrysler 300m

Question
diagnostic procedure for 2002 chrysler 300m code 480

Answer
Symptom:
P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT
When Monitored and Set Condition:
P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT
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.
POSSIBLE CAUSES
LOW SPEED RADIATOR FAN RELAY OPERATION
(A16) FUSED B+ FEED CIRCUITS
LOW SPEED RADIATOR FAN RELAY RESISTANCE
(C24) LOW SPEED RAD FAN RELAY CONTROL CIRCUIT OPEN
(C24) LOW SPEED RAD FAN RELAY CONTROL CIRCUIT SHORT TO GROUND
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, actuate the Radiator Fan Relay.
Is the Low Speed Radiator Fan Relay operating?
All
Yes ! Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
No ! Go To 2
2 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Ignition on, engine not running.
Measure the voltage of the (A16) Fused B+ Feed circuit in the PDC.
Is the voltage above 11.0 volts?
All
Yes ! Go To 3
No ! Repair the (A16) Fused B+ Output circuit. Inspect the related
fuse and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
203
DRIVEABILITY - NGC
TEST ACTION APPLICABILITY
3 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Measure the resistance of the Low Speed Radiator Fan Relay between the Fused
Ignition Switch Output terminal and the Low Speed Rad Fan Relay Control
terminal.
Is the resistance between 60 to 85 ohms?
All
Yes ! Go To 4
No ! Replace the Low Speed Radiator Fan Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
4 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Disconnect the 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 (C24) Low Speed Rad Fan Relay Control circuit from
the PDC to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 5
No ! Repair the open in the (C24) Low Speed Rad Fan Relay Control
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
5 Turn the ignition off.
Remove the Low Speed Radiator Fan Relay from the PDC.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (C24) Low Speed Rad Fan Control
circuit at the PDC.
Is the resistance below 100 ohms?
All
Yes ! Repair the short to ground in the (C24) Low Speed Rad Fan Relay
Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
No ! Go To 6
6 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accordance
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.