CAR OBD CODES

P1660 OBD Code Definition:
Cooling Fans Control Circuit
P1660 OBD Code Description:

• Malfunction Indicator Light (MIL) ON

• Fuse(s) faulty
• Wiring and/or Connector(s) from/to Coolant Fan Control Module (J293) faulty
• Coolant Fan Control Module faulty
• Engine Control Module Power Supply Relay (J271) faulty

• Check Fuse(s)
• Check Wiring and/or Connector(s) from/to Coolant Fan Control Module (J293)
• Check Coolant Fan Control
  • Perform Output Test
• Check/Replace Coolant Fan Control Module (J293)
  • Check Activation Signal with Ocilloscope
• Check Engine Control Module Power Supply Relay (J271)
  • only applies if the Coolant Fan is running with Engine cooled down and Ignition OFF until Battery is drained

• When found in Audi A3 (8P), the complete Coolant Fan may need to be replaced. Detailed Instructions and Repair Information can be found under Recall 19D8 (2004439).