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DRIVEABILITY - DIESEL
Symptom:
P1499-HYDRAULIC COOLING FAN SOLENOID CIRCUIT OPEN
CIRCUIT
When Monitored and Set Condition:
P1499-HYDRAULIC COOLING FAN SOLENOID CIRCUIT OPEN CIRCUIT
When Monitored: With the ignition on.
Set Condition: The ECM does not detect voltage on the Hydraulic Cooling Fan Solenoid
Control circuit.
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
HYDRAULIC COOLING FAN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
HYDRAULIC COOLING FAN SOLENOID CONTROL CKT OPEN
HYDRAULIC COOLING FAN SOLENOID
ENGINE CONTROL MODULE
TEST
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
With the DRBIII , actuate the Hydraulic Cooling Fan Solenoid.
Monitor the DRB for ECM DTCs.
Did this DTC set again?
Yes → Go To 2
→ Go To 6
No
2
Turn the ignition off.
Disconnect the Hydraulic Cooling Fan Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit.
Does the test light illuminate brightly?
Yes → Go To 3
→ Repair the ASD Relay Output circuit for an open.
No
POSSIBLE CAUSES
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
184
APPLICABILITY
All
All
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