Diagnostic Aids
If PCM, control circuitry and shift solenoids are functioning properly and transmission still does not shift correctly, problem may be hydraulic or mechanical.
4T60 SHIFT SOLENOID OPERATING SEQUENCE
| Gear | Solenoid A | Solenoid B | ||
|---|---|---|---|---|
| 1st Gear | Closed | Closed | ||
| 2nd Gear | Open (1) | Closed | ||
| 3rd Gear | Open (1) | (1) Open | ||
| 4th Gear | Closed | (1) Open | ||
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