Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test

Special Tools 

DT-48616  Solenoid Assembly Test Kit & Adapter Harness

For equivalent regional tools, refer to Special Tools .

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-48616-1  test plate is bolted to the control solenoid valve assembly on the valve body mounting surface. Pressurized air is passed into the aluminum test block, through the control solenoid valve assembly solenoid passage and back to a pressure gauge on the test block. 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.

1. Ignition Off
2. Remove the Q8 Control Solenoid Valve Assembly and filter plate 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-48616-1  test plate to the filter plate, and Q8 Control Solenoid Valve Assembly. Use the bolts and washers supplied with the tool to attach the test block. 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 for test plate port identification.
NOTE:

If air pressure greater than 345 kpa (50 psi) is applied, an accurate test of the shift solenoid cannot be performed.

5. Regulate the shop air pressure to 310 - 345 kpa (45 - 50 psi) and connect the line to the DT-48616-1  test plate air inlet port.
NOTE:

MY 2017 and later software will not allow the transmission control module to control the pressure control solenoid valves without a valid park or neutral signal indicated by the signal circuits for the B15 Internal Mode Switch.

6. Connect a 3 A fused jumper from signal circuit terminal B X2 to low reference terminal F X2 or chassis ground and another 3 A fused jumper from signal circuit terminal E X2 to low reference terminal F X2 or chassis ground.
7. Connect the DT-48616-10  harness to the vehicle harness and the Q8 Control Solenoid Valve Assembly.

8. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   The TCM limits the time the solenoids are commanded on to prevent overheating of the solenoids. Once the time limit is reached, the TCM prevents the test from being continued for 5 min. The ignition must remain ON during the 5 min countdown period.

   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

   • Go to next step: If the specified state 
10. Verify DTC P182E is not set.
    • If DTC P182E 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 P182E is not set.
    • Go to next step: If DTC P182E 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 Of with a scan tool. Repeat test as necessary.
    • If the pressure gauge does not change 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If the pressure gauge changes 
12. Solenoids are not grossly stuck.