Solenoid Testing Procedure
| Callout | Component Name |
|---|---|
| 1 | Regulated Air Supply |
| 2 | Test Ports |
| 3 | Scan Tool |
| 4 | Test Pressure Gauge |
| 5 | Electrical Connector Sleeve |
The automatic transmission (A/T) electrical connector passage sleeve allows the test tool harness to be correctly orientated for electrical operation of the transmission control module (TCM). Do not connect the test harness to the TCM without using the A/T Electrical Connector Passage Sleeve. Failure to use the sleeve could allow the test harness to be incorrectly positioned which will result in permanent TCM damage.
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.
With the ignition ON and the engine OFF, the transmission control module (TCM) 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 PSI gauge is not connected as those solenoids cycle on and off.
- Align and install the electrical connector sleeve to the control solenoid valve assembly and secure with the connector slide lock.
- If necessary, clean each side of the filter plate assembly and install the filter plate assembly back on the control solenoid valve assembly. Clean the mounting surface of the DT 47825 kit.
- Bolt the DT 47825 kit 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 (44 lb in).
- Connect the test harness supplied with the DT 47825 kit to the vehicle harness and to the control solenoid valve assembly. Engage the connector locks.
- Turn the ignition ON.
- Cover the DT 47825 kit test block ports with a shop towel. Transmission fluid may exit these ports when the solenoids are commanded ON.
- Connect regulated shop air to the DT 47825 kit air inlet. Do not exceed the recommended air pressure of 620.5-689.4 Kpa (90-100 psi).
- With the ignition ON and the scan tool 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 Plate to Component Identification for correct solenoid function and test plate port connections for the solenoid being tested.
- The solenoid should allow air pressure to flow or prevent air pressure flow depending on the solenoid state indicated in the table below.
- Perform each ignition state and command several times to determine the condition of the solenoid in question. Release the test air pressure from the pressure the gauge between solenoid tests.
| Commanded State | Port On Test Block | Expected Result |
|---|---|---|
| Ignition Off, no solenoids commanded and TCM not communicating | A, C, G | Air Flow |
| Ignition On, 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 |
| PC Solenoid 4 - Command On | D, E, H | Air Flow |
| PC Solenoid 5 - Command On | F | Air Flow |
| Line PC Solenoid - Command Increase/Decrease | A | 0 Kpa = 0 psi 200 Kpa = 0 psi 400 Kpa = 0 psi 600 Kpa = 20 psi 800 Kpa = 35 psi 1000 Kpa = 50 psi 1200 Kpa = 52-68 psi, gauge fluctuating 1400 Kpa = 65-80 psi, gauge fluctuating 1600 Kpa = 80-95 psi, gauge fluctuating 1800 Kpa = Control Function should abort |