TEST ACTION APPLICABILITY
3 Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Measure the resistance of the Radiator Fan Relay between the Fused Ignition Switch
Output terminal and the Rad Fan Relay Control terminal.
Is the resistance between 60 to 85 ohms?
All
Yes → Go To 4
No → Replace the Radiator Fan Relay.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
4 Turn the ignition off.
Remove the 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 (C24) 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) Rad Fan Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
5 Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Disconnect the PCM harness connector.
Measure the resistance between ground and the Low Speed Rad Fan Control circuit
at the PDC.
Is the resistance below 100 ohms?
All
Yes → Repair the short to ground in the 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 accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
180
DRIVEABILITY - NGC
P0480-COOLING FAN 1 CONTROL CIRCUIT — Continued
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