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Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test

Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test



Special Tools

EL 35616 GM-Approved Terminal Test Kit

EL 38522 Variable Signal Generator


For equivalent regional tools, refer to Special Tools .


The purpose of this test is to provide a simulated input/output speed sensor (ISS/OSS) signal to the control solenoid valve assembly ISS/OSS input circuits.


Transmission Input Speed Sensor

1. Ignition OFF, disconnect the ISS wiring harness connector X3 (1) from the control solenoid valve assembly.

2. Ignition ON, test for 8.3-9.3 volts at terminal A.

3. If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .

4. Ignition OFF, using the EL 35616 terminal test kit , connect the EL38522 variable signal generator red lead to the ISS signal circuit terminal B on the TCM.

5. Connect the black lead from the EL 38522 variable signal generator to ground.

6. Set the EL 38522 variable signal generator to 5 volts, the frequency to 300 Hz, and the percent duty cycle to 50 or the normal position.

7. Ignition ON, verify with a scan tool the Transmission ISS parameter is between 495-505 RPM.



Transmission Output Speed Sensor

1. Ignition OFF, disconnect the OSS wiring harness connector X4 (2) from the control solenoid valve assembly.

2. Ignition ON, test for 8.3-9.3 volts at terminal A.

3. If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .

4. Ignition OFF, using the EL 35616 terminal test kit , connect the EL 38522 variable signal generator red lead to the OSS signal circuit terminal B on the TCM.

5. Connect the black lead from the EL 38522 variable signal generator to ground.

6. Set the EL 38522 variable signal generator to 5 volts, the frequency to 300 Hz, and the percent duty cycle to 50 or the normal position.

7. Ignition ON, verify with a scan tool the Transmission OSS parameter is between 256-266 RPM.

8. If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .