Chart C-8C, 4T60 Transaxle 1ST Gear Switch Electrical Diagnosis - 3.4L PFI W Body

Fig 1: Chart C-8C, 4T60 1st Gear Switch Circuit (3.4L PFI W Body)

Courtesy of GENERAL MOTORS CORP.

The 4T60 transaxle uses 2 solenoids to control shifting: Shift solenoid "A" and shift solenoid "B". ECM monitors TPS and vehicle speed verses engine speed to determine correct shift points.

Fig 2: Chart C-8C, 4T60 1st Gear Switch Troubleshooting 1 of 2 (3.4L PFI W Body)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Chart C-8C, 4T60 1st Gear Switch Troubleshooting 2 of 2 (3.4L PFI W Body)

Courtesy of GENERAL MOTORS CORP.