P1641 - Cooling Fan Relay 1 Control Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
Possible causes
- Faulty Cooling Fan Relay
- Cooling Fan Relay harness is open or shorted
- Cooling Fan Relay circuit poor electrical component
  What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Cooling Fan not working
P1641 Description

Ignition voltage is supplied to the Cooling Fan relay coil. The Powertrain Control Module (PCM) controls the relay by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line which is monitored by the PCM. When the PCM is commanding a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage). If the fault detection circuit senses a voltage other than what is expected, the fault line status will change causing the code to set.

The relay is used to control the high current flow to the cooling fan motors. This allows the PCM driver to only have to handle the relatively low current used by the relay.

P1641 Information for specific makes
P1641 BUICK Cooling Fan Relay 1 Control Circuit
P1641 CADILLAC Cooling Fan Relay 1 Control Circuit
P1641 CHEVROLET Cooling Fan Relay 1 Control Circuit
P1641 DODGE Cabin Heater 1
P1641 FORD Fuel Pump Driver Module Fault Conditions
P1641 GMC Cooling Fan Relay 1 Control Circuit
P1641 HONDA ACTTRQ Motor Torque Signal Circuit High Input
P1641 HYUNDAI VI Motor Open / Short Coil 2
P1641 JAGUAR Fuel Pump Relay 1 Malfunction
P1641 LINCOLN Fuel Pump Driver Module Fault Conditions
P1641 MAZDA Fuel Pump Circuit Malfunction
P1641 MERCEDES-BENZ Engine Control Module TP Signal
P1641 MERCURY Fuel Pump Driver Module Fault Conditions
P1641 PONTIAC Cooling Fan Relay 1 Control Circuit
P1641 SAAB Fuel Pump Relay No Voltage To Fuel Pump / Oxygen Sensor Heater
P1641 SATURN Cooling Fan Relay 1 Control Circuit
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 3
 
1=Easy 2=Moderate 3=Hard  
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