KH - Hydraulic Cooling Fan
KH: HYDRAULIC COOLING FANKH1 - DTC P1474: Check HCF Solenoid Resistance
Key off.
Disconnect HCF solenoid.
Measure HCF solenoid resistance.
Is resistance between 8.5 and 11.5 ohms?
YES GO to KH2.
NO REPLACE HCF solenoid assembly.
KH2 - Check VPWR Voltage To HCF Solenoid
Key on.
Measure VPWR circuit voltage at HCF solenoid.
Is voltage greater than 10.5 volts?
YES GO to KH3.
NO REPAIR open circuit
KH3 - Check HCF Circuit For Open In Harness
Measure resistance of HCF circuit between PCM harness connector and HCF solenoid harness connector.
Is resistance less than 5 ohms?
YES GO to KH4.
NO REPAIR open circuit.
KH4 - Check HCF Circuit For Short To Power In Harness
Key on.
Measure voltage between HCF circuit at the PCM harness connector and ground.
Is voltage less than 1.0 volt?
YES KEY OFF. GO to KH5.
NO REPAIR short circuit.
KH5 - Check HCF Circuit For Short To Ground In Harness
Disconnect scan tool from DLC.
Measure resistance between HCF circuit at the PCM harness connector and ground.
Is resistance greater than 10,000 ohms?
YES REPLACE PCM.
NO REPAIR short circuit.