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

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools

EL 35616 GM-Approved Terminal Test Kit
EL 38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools .

Fig 1: View Of Special Tool & Control Solenoid Valve and Transmission Control Module Assembly

Courtesy of GENERAL MOTORS COMPANY

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

Ignition OFF, disconnect the ISS wiring harness connector X3 (1) from the control solenoid valve assembly.
Ignition ON, test for 11-14 volts at terminal B.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
Ignition OFF, using the EL 35616 terminal test kit , connect the EL 38522 variable signal generator red lead to the ISS signal circuit terminal A on the TCM.
Connect the black lead from the EL 38522 variable signal generator to ground.
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.
Ignition ON, verify with a scan tool the Transmission ISS parameter is between 495-505 RPM.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .

Transmission Output Speed Sensor

Ignition OFF, disconnect the OSS wiring harness connector X4 (2) from the control solenoid valve assembly.
Ignition ON, test for 11-14 volts at terminal B.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
Ignition OFF, using the EL 35616 terminal test kit , connect the EL 38522 variable signal generator red lead to the OSS signal circuit terminal A on the TCM.
Connect the black lead from the EL 38522 variable signal generator to ground.
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.
Ignition ON, verify with a scan tool the Transmission OSS parameter is between 745-825 RPM.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .