Chrysler 300M 2002 Service Manual page 2628

P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT —
TEST
5 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 TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Radiator Fan Relay Control circuit from the PDC to the
appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 6
→ Repair the open in the Coolant Fan Relay Control circuit.
No
6 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 Radiator Fan #1 Relay Control
circuit at the PDC.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the Coolant Fan Relay Control
→ Go To 7
No
7 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.
Repair
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
199
Continued
APPLICABILITY
All
All
All