For 1990-2009 cars

#### Special Tools

• | J 35616 GM-Approved Terminal Test Kit

• | J 38522 Variable Signal Generator

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

1. Disconnect the ISS/OSS wiring harness connector from the control solenoid (w/body and TCM) valve assembly.
2. Using the J 35616 , connect the J 38522 to the affected ISS or OSS signal circuit on the control solenoid (w/body and TCM) valve assembly.

2.1. | Set the J 38522 Signal to 8 volts, the Frequency to 120 and the Percent Duty Cycle to 50.

2.2. | Ignition On, observe either the scan tool parameter ISS Signal or OSS Signal.

2.3. | The signal parameter should display between 100-400 RPM.

⇒ | If the signal display is not in this range, the control solenoid (w/body and TCM) valve assembly is not reading the input signal correctly and is faulty.