Circuit figure

Fig 1: Lock-Up Control Solenoid Assembly Circuit Diagram (SLU)

Courtesy of SUBARU OF AMERICA, INC.

Inspection steps

1. Transmission wire unit check (lock-up control solenoid (SLU))
   1. Disconnect the connector L4 of the transmission wire.
   2. Measure the resistance between the terminals.
      RESISTANCE SPECIFICATIONS
      
      

      Inspection terminals	Inspection conditions	Standard value
      L4-12 (SLU+) - L4-4 (SLU-)	20°C	5.0 to 5.6 Ω
      L4-12 (SLU+) - chassis ground	Always	10 k Ωor more
      L4-4 (SLU-) - chassis ground	Always	10 k Ωor more

   3. Connect the connector L4 of the transmission wire.

   NG: go to step  4.

   OK: Go to next step.

2. Check wiring harness and connector (transmission wire - transmission control computer)
   1. Disconnect the connector A18 of the transmission control computer ASSY.
   2. Measure the resistance between the terminals.
      RESISTANCE SPECIFICATIONS
      
      

      Inspection terminals	Inspection conditions	Standard value
      A18-13 (SLU+) - A18- 1 (SLU-)	20°C	5.0 to 5.6Ω
      A18-13 (SLU+) - chassis ground	Always	10 k Ωor more
      A18-1 (SLU-) - chassis ground	Always	10 k Ωor more

   3. Connect the connector A18 of the transmission control computer ASSY.

   NG: Repair or replacement of wiring harness or connector

   OK: Go to next step.

3. Replacement of transmission control computer ASSY
   1. Replace the transmission control computer ASSY. (Refer to Transmission control computer ASSY )

   Next: AT unit correction (refer to Inspection for problems that do not normally occur )

4. Check of lock-up control solenoid (SLU) unit
   1. Check the lock-up control solenoid (SLU) unit. (Refer to Neutral start switch ASSY )

   NG: Repair or replacement of transmission valve body ASSY (refer to Transmission valve body ASSY )

   OK: Repair or replacement of transmission wire (refer to Transmission wire )