Automatic Transmission: Solenoid: Inspection

Resistance check
- Using an ohmmeter, check the resistance between each terminals (S1/S2/SL) and body.
  Solenoid S1, S2 and lock-up solenoid SL resistance:
  
  11 - 15 Ω (at 20°C)
  
  (Reference) 12-16 Ω (at 40°C)
- Using an ohmmeter, check the resistance between each terminals (STH/SLU) and (STHG/SLUG).
  Pressure control solenoid resistance and Lock-up solenoid resistance: 5 - 5.6 Ω (at 20°C)
  
  (Reference) 5.4-6.1 Ω (at 40°C)
Fig 1: Checking Resistance Between Each Terminals
Courtesy of ISUZU MOTOR CO.

NOTE: If the pressure control solenoid resistance is not within specification, replace the valve body assembly.
Operation check Check the solenoid operation by blowing into an oil hole as shown in Fig 2 and Fig 3 .

SOLENOID S1 AND S2 (NORMAL CLOSE TYPE

When battery terminal is disconnected	No air leaks
When battery terminal is connected	Air passes through

Fig 2: Checking Solenoid Operation By Normal Close

Courtesy of ISUZU MOTOR CO.

Fig 3: Checking Solenoid Operation By Normal Open

Courtesy of ISUZU MOTOR CO.