Cooling Fan Control System Inspection

1. Connect the M-MDS to the DLC-2.
2. Start the engine and warm it up to normal operating temperature.
3. Perform the KOER self-test. (See KOEO/KOER SELF TEST article.)
4. Verify the cooling fan operates during the KOER self-test.

Single fan control module 

Cooling fans do not operate 

• Inspect the followings:
  • Open circuit between the fan relay and battery positive terminal
  • Open circuit between the fan relay and PCM terminal 1BI
  • Open circuit between the fan relay and fan control module terminal 1C
  • Open circuit between the control module terminal 1A and ground
  • Fan control module (See FAN CONTROL MODULE INSPECTION article.)
  • Open or short circuit between fan control module terminal 1B and PCM terminal 1BR
  • Open or short circuit between ignition switch (IG1) and fan relay
• If there is malfunction, repair or replace malfunctioning part.
• If there is no malfunction, replace the fan control module. (See COOLING FAN COMPONENT REMOVAL/INSTALLATION article.)

Cooling fan motor No. 1 does not operate 

• Inspect for followings:
  • Open or short to ground circuit between the fan control module and cooling fan motor No. 1
  • Poor connection of the fan control module connector or cooling fan motor No. 1 connector
  • Cooling fan motor No. 1 (See FAN MOTOR INSPECTION article.)
• If there is malfunction, repair or replace malfunctioning part.
• If there is no malfunction, replace the fan control module. (See COOLING FAN COMPONENT REMOVAL/INSTALLATION article.)

Cooling fan motor No. 2 does not operate 

• Inspect for followings:
  • Open or short to ground circuit between the fan control module and the cooling fan motor No. 2
  • Poor connection of the fan control module connector or the cooling fan motor No. 2 connector
  • Cooling fan motor No. 2 (See FAN MOTOR INSPECTION article.)
• If there is malfunction, repair or malfunctioning part.
• If there is no malfunction, replace the fan control module. (See COOLING FAN COMPONENT REMOVAL/INSTALLATION article.)

Dual fan control module 

Cooling fans do not operate 

• Inspect for followings:
  • Open circuit between cooling fan relay No. 1 and PCM terminal 1BI
  • Open circuit between cooling fan relay No. 2 and PCM terminal 1BI
  • Open or short circuit between fan control module No. 1 terminal 1B and PCM terminal 1BR
  • Open or short circuit between fan control module No. 2 terminal 1B and PCM terminal 1BR
• If there is malfunction, repair or replace malfunctioning part.
• If there is no malfunction, replace the fan control module. (See COOLING FAN COMPONENT REMOVAL/INSTALLATION article.)

Cooling fan motor No. 1 does not operate 

• Inspect for followings:
  • Open or short to ground circuit between fan control module No. 1 and cooling fan motor No. 1
  • Poor connection of the fan control module No. 1 connector or cooling fan motor No. 1 connector
  • Cooling fan motor No. 1 (See FAN MOTOR INSPECTION article.)
  • Open or short circuit between ignition switch (IG1) and cooling fan relay No. 1
  • Cooling fan relay No. 1 malfunction (See RELAY INSPECTION article.
  • Open circuit between fan relay No. 1 and battery positive terminal
  • Open circuit between fan relay No. 1 and fan control module No. 1 terminal 1A
  • Open circuit between fan control module No. 1 terminal 1C and ground
  • Poor connection of the fan control module No. 1 connector
• If there is malfunction, repair or replace malfunctioning part.
• If there is no malfunction, replace the fan control module No. 1. (See COOLING FAN COMPONENT REMOVAL/INSTALLATION article.)

Cooling fan motor No. 2 does not operate 

• Inspect for followings:
  • Open or short to ground circuit between fan control module No. 2 and cooling fan motor No. 2
  • Poor connection of the fan control module No. 2 connector or cooling fan motor No. 2 connector
  • Cooling fan motor No. 2 (See FAN MOTOR INSPECTION article.)
  • Open or short circuit between ignition switch (IG1) and cooling fan relay No. 2
  • Cooling fan relay No. 1 malfunction (See RELAY INSPECTION article.
  • Open circuit between fan relay No. 2 and battery positive terminal
  • Open circuit between fan relay No. 2 and fan control module No. 2 terminal 1A
  • Open circuit between fan control module No. 2 terminal 1C and ground
  • Poor connection of the fan control module No. 2 connector
• If there is malfunction, repair or replace malfunctioning part.
• If there is no malfunction, replace the fan control module No. 2. (See COOLING FAN COMPONENT REMOVAL/INSTALLATION article.)