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Symptom:
P1499-HYDRAULIC COOLING FAN SOLENOID CIRCUIT SHORT
CIRCUIT
When Monitored and Set Condition:
P1499-HYDRAULIC COOLING FAN SOLENOID CIRCUIT SHORT CIRCUIT
When Monitored: With the ignition on and the ECM attempting to actuate the Hydraulic
Cooling Fan Soleniod.
Set Condition: The ECM detects excessive current on the Hydraulic Cooling Fan Solenoid
Control circuit.
INTERMITTENT CONDITION
HYDRAULIC COOLING FAN SOLENOID
HYDRAULIC COOLING FAN SOLENOID CONTROL SHORT TO VOLTAGE
ECM
TEST
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
With the DRBIII , actuate the Hydraulic Cooling Fan Solenoid.
With the DRBIII , read the ECM DTCs.
Did this DTC set again?
Yes → Go To 2
→ Go To 4
No
2
Turn the ignition off.
Disconnect the Hydraulic Cooling Fan Solenoid harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the Hydraulic Cooling Fan Solenoid Control circuit.
Is the voltage below 1.0 volt?
Yes → Go To 3
→ Repair the Hydraulic Cooling Fan Solenoid Control circuit for a
No
POSSIBLE CAUSES
ACTION
short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
187
APPLICABILITY
All
All
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