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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transaxle - 4T80-E - Service, Diagnosis & Troubleshooting) >> Shift Solenoid Leak Test

Shift Solenoid Leak Test

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 44246  Solenoid Testing Kit. See Special Tools .

Leak Test Procedure

    IMPORTANT:
    • This procedure tests On/Off type solenoid valves.
    • Visually inspect the physical condition of the solenoid before testing. Inspect the O-rings before and after the test to be sure that they are not cut or damaged.
  1. Remove the solenoid from the lower control valve body. Refer to Lower Control Valve Body Assembly Disassemble in the 4T80-E section of the Transmission Unit Repair Manual.
    2. Fig 1: View of Solenoid Valve Inserted Into J 44246
    GM665133Courtesy of GENERAL MOTORS CORP.
  2. Install the 1-2 shift solenoid valve or the 2-3 shift solenoid valve into bore number 3 of the J 44246  and install the factory retainer clip to retain the solenoid. See Special Tools .
    3. Fig 2: Connecting Solenoid Testing Harness to Solenoid
    GM665136Courtesy of GENERAL MOTORS CORP.
  3. Connect the solenoid testing harness supplied with the J 44246  to the solenoid. See Special Tools .
    4. IMPORTANT: Do not use air pressure in excess of 8.44 Kg/cm (120 psi). Excessive pressure will not allow the solenoid ball check valve to seat properly. Recommended air pressure is 3.52 Kg/cm (50 psi).
  4. Apply compressed air to the J 44246  . See Special Tools .
  5. Connect the solenoid testing harness to the, 12 volt, positive and negative (-) battery terminals.
  6. Observe if the solenoid is operating electrically. An audible clicking noise can be heard when connecting or disconnecting power.
    7. IMPORTANT:
    • All solenoids need to be energized to seal.
    • A small amount of air leakage is normal (+/- 3 psi) (+/- 21 kPa).
  7. Observe the air flow through the solenoid. The flow will completely or nearly completely stop. Replace the solenoid if there continues to be an obvious air leak when the solenoid is energized.
    8. IMPORTANT: Inspect the O-rings after the test to be sure that they are not cut or damaged.
  8. Install the solenoid into the lower control valve body. Refer to Lower Control Valve Body Assembly Disassemble in the 4T80-E section of the Transmission Unit Repair Manual.
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