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 .

Fig 1: Special Tools

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

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.
   • If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
3. 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.
4. Connect the black lead from the EL 38522  variable signal generator to ground.
5. 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.
6. 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

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.
   • If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
3. 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.
4. Connect the black lead from the EL 38522  variable signal generator to ground.
5. 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.
6. Ignition ON, verify with a scan tool the Transmission OSS parameter is between 256 - 266 RPM.
   • If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .