Chart C-8B, 4T60 Transaxle Shift Solenoid Functional Check - 3.8L PFI (VIN L & 1) 1992: Notes

The 4T60 transmission uses two solenoids to control shifting. Shift solenoid "A" and shift solenoid "B". See 4T60 SHIFT SOLENOID OPERATING SEQUENCE  for solenoid operating sequence.

PCM monitors TPS and vehicle speed versus engine speed to determine the correct shift points. If PRNDL position indicates manual low position, PCM will keep both solenoids energized until 54 RPM at which point PCM will force a shift a de-energizing solenoid "A". Manual 2nd and manual 3rd are controlled hydraulically within transmission. See Figure and Figure .

1. With key on and engine off, PCM should be commanding 1st gear. Both shift solenoid control circuits will be grounded.
2. This test ensures PCM can control ground to shift solenoid "A" properly.
3. This test ensures PCM can control ground to shift solenoid "B" properly.
4. DO NOT  measure resistance until ignition has been off for at least 10 seconds to ensure PCM has powered down completely.