Chrysler 300M 2002 Service Manual page 2627

DRIVEABILITY - NGC
P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT —
TEST
2 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
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.
With the engine running at normal operating temperature, monitor the DRBIII
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIII Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
With the DRBIII , actuate the Radiator Fan Relay.
Wiggle the wire harness from the Radiator Fan Relay to the PCM while the relay is
actuating.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary
→ Test Complete.
No
3 Turn the ignition off.
Remove the Radiator Fan #1 Relay from the PDC.
Ignition on, engine not running.
Measure the voltage of the Fused B+ Feed circuit in the PDC.
Is the voltage above 11.0 volts?
Yes → Go To 4
→ Repair the Fused B+ Output circuit. Inspect the related fuse and
No
4 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 Radiator Fan Relay Control
terminal.
Is the resistance between 60 to 80 ohms?
Yes → Go To 5
→ Replace the Coolant Fan Relay.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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Continued
APPLICABILITY
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