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Solenoid Testing Procedure

Fig 1: Testing Control Solenoid Assembly
GM2539309Courtesy of GENERAL MOTORS COMPANY
CAUTION:

To avoid solenoid overheating and possible internal damage, do not continuously operate the solenoid for more than 2 minutes at a time. Drain the TCM of excess transmission fluid before attaching to test block and use caution when attaching air to test block air inlet.

NOTE:

With the Vehicle in Service Mode and the engine OFF, the transmission control module will normally cycle some of the transmission solenoids On and Off to facilitate keeping the ports and solenoids clean and free of debris. This dither function is a normal activity and will cause the valves to cycle open and closed quickly when the TCM is powered up. This may cause some air to exit the ports where the pressure gauge is not connected as those solenoids cycle on and off.

  1. If necessary, clean each side of the filter plate assembly and install the filter plate assembly back on the Q8 Control Solenoid Valve Assembly. Clean the mounting surface of the DT-47825  test block.
  2. Bolt the DT-47825  test block to the control solenoid valve assembly mounting surface. Use the bolts and washers supplied with the tool to attach the test block. Tighten the bolts to 5 N.m (44 lb in).
  3. Connect the DT-47825-20  adapter harness supplied with the DT-47825  test kit to the vehicle harness and to the Q8 control solenoid valve assembly. Engage the connector locks.
  4. Vehicle in Service Mode.
  5. Cover the DT-47825  test block ports (6) with a shop towel. Transmission fluid may exit these ports when the solenoids are commanded ON.
  6. Connect regulated shop air (4) to the DT-47825  test block air inlet. Do not exceed the recommended air pressure of 620.5-689.4 Kpa (90-100 psi).
  7. Vehicle in Service Mode and the scan tool (1) connected to the DLC connector (2) communicating with the vehicle, command the solenoid in question ON and OFF. Observe the airflow at the appropriate test port for a change as you command the solenoid. Refer to Control Solenoid Valve Assembly Solenoid Performance Test Block to Component Identification for correct solenoid function and test block port connections for the solenoid being tested.
  8. The solenoid should allow air pressure to flow or prevent air pressure flow depending on the solenoid state. The test results are read on the pressure gauge (5).
  9. Command the solenoid valve ON and OFF several times to determine the condition of the solenoid in question. Release the test air pressure from the pressure the gauge between solenoid tests.
Control Solenoid Valve Assembly Solenoid Performance Test Block to Component Identification

Commanded State Port On Test Block Expected Result
Vehicle OFF, no solenoids commanded and TCM not communicating A, C, G Air Flow
Vehicle in Service Mode, no solenoids commanded and TCM communicating A, B, C, D, E, F, G, H No air flow from any port and no control solenoid valve assembly air leaks. This may take up to 30 seconds after vehicle is On.
Shift Solenoid 1 D Air Flow
Shift Solenoid 2 H Air Flow
Pressure Control Solenoid 2 C Air Flow
Pressure Control Solenoid 3 G Air Flow
Pressure Control Solenoid 4 B Air Flow
Pressure Control Solenoid 5 - Command On E Air Flow
Line Pressure Control Solenoid - Command Increase/Decrease A 0 Kpa = 0 psi
36.6 Kpa = 20-30 psi
52.5 Kpa = 32-56 psi
71.2 Kpa = 44-74 psi
90 Kpa = 70-90 psi
108 Kpa = 90-100+psi
Greater than 108 Kpa = Scan tool displays Device Control Not Allowed
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