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 .

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 - 12 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 .
3. 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.
4. Connect the black lead from the EL 38522  variable signal generator to chassis 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.
NOTE:

If the parameter value is not within the specified range, or a loss of scan tool communication with the TCM is observed, connect the black lead from the EL 38522  variable signal generator to battery ground.

6. Ignition ON, verify with a scan tool the Transmission ISS parameter is between 490 - 510 RPM.
   • If not between 490 and 310 RPM 

     Replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .

   • Go to next step: If between 490 and 5110 RPM 
7. All OK.

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 - 12 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 .
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 A on the TCM.
4. Connect the black lead from the EL 38522  variable signal generator to chassis 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.
NOTE:

If the parameter value is not within the specified range, or a loss of scan tool communication with the TCM is observed, connect the black lead from the EL 38522  variable signal generator to battery ground.

6. Ignition ON, verify with a scan tool the Transmission OSS parameter is between 745 - 825 RPM.
   • If not between 745 and 825 RPM 

     Replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .

   • Go to next step: If between 745 and 825 RPM 
7. All OK.