Chart C-8B, 4T60 Transaxle Mode Switch Electrical Diagnosis - 3.4L PFI W Body: Notes

Fig 1: Chart C-8B, 4T60 Transaxle Mode Switch Circuit (3.4L PFI W Body)

Courtesy of GENERAL MOTORS CORP.

Transmission uses 2 solenoids to control shifting. ECM monitors the TPS and vehicle speed to determine correct shift points.

NOTE: Test number refers to test number on diagnostic chart.

This test checks to see if transaxle mode switch is transmitting command to ECM to turn off solenoid "A" which enables 2nd gear. If solenoid "A" does not go off and transaxle mode switch is on, refer to CHART C-8A (4 OF 4) - TRANSAXLE SHIFT SOLENOID.