• Code: L4-51
• Description: Process cooling fan 2 trouble. The lock signal is detected during operation of the process cooling fan
• Causes: Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
• Remedy: Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

• Code: L4-52
• Description: Process cooling fan 3 trouble. The lock signal is detected during operation of the process cooling fan
• Causes: Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
• Remedy: Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

• Code: L4-53
• Description: Process cooling fan 4 trouble. The lock signal is detected during operation of the process cooling fan
• Causes: Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
• Remedy: Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

• Code: L4-54
• Description: PS cooling fan trouble. The lock signal is detected during operation of the PS cooling fan
• Causes: Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
• Remedy: Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

• Code: L4-55
• Description: Process cooling fan trouble. The lock signal is detected during operation of the process cooling fan
• Causes: Harness connection trouble between the PCU PWB and the fan motor. PCU PWB trouble. Fan motor trouble. The fan is not rotating due to other trouble. (Power is not supplied to the fan motor.)
• Remedy: Use Sim. 6-2 to check the operation of the fan motor. Check the harness and the connector between the PCU PWB and the fan motor. Replace the PCU PWB. Replace the fan motor.

• Code: L6-10
• Description: Polygon motor trouble. It is judged that the lock signal of the LSU polygon motor is not outputted. When the lock signal is checked 7sec after starting the polygon motor rotation, it is judged that the polygon motor does not rotate normally.
• Causes: Disconnection or breakage of the LSU connector or the harness inside the LSU. Polygon motor trouble. LSU PWB trouble.
• Remedy: Check the polygon motor operation with Sim. 61-1. Check connection of the harness and the connector. If the trouble still remains, replace the LSUcnt PWB or replace the LSU PWB.

• Code: L8-01
• Description: NO full wave signal
• Causes: PCU PWB trouble. Power unit trouble. Harness trouble.
• Remedy: Replace the PCU PWB. Replace the power unit. Check connection of the connector and the harness.

• Code: L8-05
• Description: No full wave signal (PCU detection)
• Causes: Disconnection or breakage of the connector to the PCU PWB or the harness in the power unit. PCU PWB trouble. Power unit trouble.
• Remedy: Check connection of the harness and the connector. Replace the PCU PWB. Replace the power unit.