Symptom:
*CHECKING RAD FAN HIGH SPEED OPERATION (TURBO)
POSSIBLE CAUSES
GROUND CIRCUIT OPEN
RADIATOR FAN MOTOR
FUSED B+ CIRCUIT
RADIATOR FAN RELAY OUTPUT CIRCUIT
RAD FAN RELAY #1 OPERATION
RADIATOR FAN RELAY
RELAY #3 GROUND CIRCUIT OPEN (Z1)
TEST ACTION APPLICABILITY
1 WARNING: The Checking Low Speed Fans Operation chart must be per-
formed first before continuing.
Turn the ignition on.
With the DRBIIIt, actuate the High Speed Rad Fan Relay.
Is the Rad Fan #1 operating
All
Yes → Go To 2
No → Go To 3
2 NOTE: The High Speed Relay #2 must still being actuating.
Turn the ignition on.
With the DRBIIIt, actuate the Low Speed Rad Fan Relay #1.
NOTE: Both Fans should be operating at high speed.
Is the Rad Fan #2 operation at high speed?
All
Yes → The High Speed Fans are operating normal at this time.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → At the Rad Fan Control Relay #3 connector in the PDC check the
ground circuit (Z1) for an open. If OK, replace the Rad Fan
Control Relay #3.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
3 Turn the ignition off.
Disconnect the Rad Fan #1 harness connector.
Measure the resistance between the Ground circuit in the Radiator Fan harness
connector to ground.
Is the resistance below 5.0 ohms?
All
Yes → Go To 4
No → Repair the Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
293
DRIVEABILITY - NGC
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