A/T - No Shift Problem Diagnosis Electrical/Mechanical

TSB 87-60 (Oct)

SUBJECT: CHEV. SPRINT 3 SPD TRANSAXLE

PROBLEM:
How to determine whether the no-shift problem is in the computer, or transmission -- electrical or mechanical.

PROCEDURE:
1. Engine should be warm




2. Disconnect solenoid wire (see Figure 1)

3. Start engine, shift to "L" range and accelerate to 18-20 mph. Car should be in first gear.

4. Shift to "2" range, and accelerate to 37-40 mph. Car should be in 2nd gear.

5. Shift to "D" range and accelerate. Car should be in 3rd gear when speed is about 37-40 mph.

6. If the transmission makes these shifts, the problem is not mechanical.

The problem is either a blown fuse to the computer; the or one of its sensors.