TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Using a 12-volt test light connected to 12-volts, probe the (Z723) Ground circuit in the
Radiator Fan Relay harness connector.
Does the test light illuminate?
All
Yes
→ Go To 4
No
→ Repair the (Z723) Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
NOTE: Inspect the Radiator Fan fuse located in the IPM.
Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Measure the voltage of the (A112) Fused B+ Output circuit in the Radiator Fan
harness connector.
Is the voltage above 11.0 volts?
All
Yes
→ Go To 5
No
→ Repair the (A112) Fused B+ circuit. Check and replace any open
fuses.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect the PCM harness connector.
Turn the ignition on.
Measure the voltage on the Radiator Fan Relay Control circuit at the (K173) Radiator
Fan Relay harness connector.
Is there any voltage present?
All
Yes
→ Repair the (K173) Radiator Relay Control circuit for a short to
battery voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 6
6
NOTE: Ensure the Radiator Fan Relay harness connector is connected.
Turn the ignition off.
Disconnect the PCM harness connector.
Turn the ignition on.
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.
Using a jumper wire, momentarily jumper the (K173) Radiator Fan Relay Control
circuit in the appropriate terminal of special tool # 8815 to ground.
Did the Radiator Fans operate?
All
Yes
→ 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 accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
193
DRIVEABILITY - NGC
P0480-COOLING FAN 1 CONTROL CIRCUIT —
Continued