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P0481-COOLING FAN 2 CONTROL CIRCUIT —
TEST
3
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 Rad Fan Relay Control
terminal.
Is the resistance between 60 to 85 ohms?
Yes → Go To 4
→ Replace the High Speed Radiator Fan Relay.
No
4
Turn the ignition off.
Remove the High 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 (C27) High Speed Rad 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 5
→ Repair the open in the (C27) High Speed Rad Fan Relay Control
No
5
Turn the ignition off.
Remove the High Speed Radiator Fan Relay from the PDC.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (C27) High Speed Rad Fan Relay
Control circuit in the PDC.
Is the resistance below 5.0 ohms?
Yes → Repair the short to ground in the (C27) High Speed Rad Fan
→ Go To 6
No
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.
Repair
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
Continued
191
APPLICABILITY
All
All
All
All
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