Chrysler 300M 2002 Service Manual page 2630

P0481-HIGH 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 High Speed Radiator Fan Relay.
Wiggle the wire harness from the High Speed 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 High Speed Radiator Fan Relay from the PDC.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit in the PDC.
Is the voltage above 11.0 volts?
Yes → Go To 4
→ Repair the Fused Ignition Switch Output circuit. Check and
No
4 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 Fused
Ignition Switch Output terminal and the High Speed Radiator Fan Relay Control
terminal.
Is the resistance between 60 to 80 ohms?
Yes → Go To 5
→ Replace the High Speed Radiator Fan Relay.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
201
Continued
APPLICABILITY
All
All
All