Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test

Special Tools

• DT-47825-100  Solenoid Test Plate
• DT-47825-20  Adapter Harness

For equivalent regional tools, refer to Special Tools .

Fig 1: Control Solenoid Valve Assembly Solenoids

Courtesy of GENERAL MOTORS COMPANY

The purpose of this procedure is to test the functionality of the control solenoid valve assembly solenoids for a gross stuck open or stuck closed condition. The DT-47825-100  test plate is bolted to the control solenoid valve assembly on the valve body mounting surface. Pressurized air is passed into the aluminum test plate, through the control solenoid valve assembly solenoid passage and back to a pressure gauge on the test plate. The pressure gauge indicates open if air pressure is passed through the solenoid, or closed if the solenoid is unable to pass air through. A scan tool is used to command the solenoids ON and OFF. While watching the pressure gauge, one can determine the valve functionality. The recommended shop air pressure for this test is 90 - 100 psi.

1. Ignition Off
2. Remove the Q8 Control Solenoid Valve assembly from the transmission. Refer to: Control Solenoid Valve and Transmission Control Module Assembly Replacement
CAUTION:

Refer to Fastener Caution .

NOTE:

Drain the Q8 Control Solenoid Valve Assembly of excess transmission fluid before attaching to test block and use caution when attaching air to test block air inlet.

3. Bolt the DT-47825-100  test plate to the control solenoid valve assembly on the valve body mounting surface. Use the bolts and washers supplied with the tool to attach the test plate. Tighten the bolts to 5 N.m (44 lb in) using a center out alternating torque sequence.
4. Install the pressure gauge to the affected solenoid air port. Reference the Control Solenoid Valve Assembly Solenoid Performance Test Plate to Component Identification table.
5. Regulate the shop air pressure to 310 - 345 kpa (45 - 50 psi) and connect the line to the DT-47825-100  test plate air inlet port.
6. Connect a 3 A fused jumper from signal circuit terminal B X2 to low reference terminal A X2 or chassis ground and another 3 A fused jumper from signal circuit terminal E X2 to low reference terminal A X2 or chassis ground.
7. Connect the DT-47825-20  harness to the vehicle and control solenoid valve assembly.
8. Ignition - On / Vehicle - In Service Mode
9. Verify the scan tool parameter:Internal Mode Switch A/B/C/P=Low High High Low
   • If not the specified state 

     Verify the connection of the jumper wires

   • If the specified state 
10. Verify DTC <p01> is not set.
    • If DTC <p01> is set 
    1. Clear the DTCs
    2. Ignition Off
    3. Wait for transmission control module to power down.
    4. Ignition - On / Vehicle - In Service Mode
    5. Verify DTC <p01> is not set.
    • If DTC <p01> is not set 
NOTE:
• If the solenoid valve is stuck, no pressure change will occur.
• Release the air pressure in the gauge between pressurization tests.
• Some solenoids will leak air during the test. Only pay attention to the pressure gauge change during the test.
11. Verify the pressure gauge changes when commanding the appropriate solenoid On and Off with a scan tool. Repeat test as necessary.