Grand Prix V6-3100 3.1L MFI VIN M (1994)
Transmission Controls
Shift Solenoid Operating Sequence
CIRCUIT DESCRIPTION
The 4T60E transaxle uses shift solenoid "A" and shift solenoid "B" to control shifting. Refer to table for solenoid operating sequence.
The PCM monitors the TP sensor and vehicle speed vs. engine speed to determine the correct shift points.
If the transaxle range switch indicates manual low position, the PCM will keep both solenoids "A" and "B" energized until 5400 RPM at which
point the PCM will force a shift by de-energizing solenoid "A". Manual 2nd and manual 3rd are controlled hydraulically within the transaxle.
TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks availability of B+ on CKT 441, and integrity of CKT 1222 and CKT 1223.
2. Checks the PCM's capability to turn shift solenoid "A" "ON," and "OFF."
3. Checks the PCM's capability to turn shift solenoid "B" "ON,"and"OFF."
4. Determines if shift solenoid "A" and shift solenoid "B" resistance values are within range specifications in chart.
DIAGNOSTIC AIDS:
If the PCM, control circuitry, and shift solenoids are functioning properly and the transaxle still does not shift correctly, the problem may be
hydraulic or mechanical.
