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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 .


1880312

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 11-14 volts at terminal B.
    3. ⇒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 alternator red lead to the ISS signal circuit terminal A on the TCM.
  4. Connect the black lead from the EL 38522 variable signal alternator to ground.
  5. Set the EL 38522 variable signal alternator 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.
    7. ⇒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 11-14 volts at terminal B.
    3. ⇒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 alternator red lead to the OSS signal circuit terminal A on the TCM.
  4. Connect the black lead from the EL 38522 variable signal alternator to ground.
  5. Set the EL 38522 variable signal alternator 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 745-825 RPM.
    7. ⇒If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
   


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