No 3-4 Upshift

NO 3-4 UPSHIFT Rough or Shudder 3-2 Shift At Closed Throttle In D/No 3-4 upshift
1. 3-4 shift solenoid not energizing electrically, wires shorted, or an open circuit. Check circuit continuity, 3-4 solenoid wire pin 52 should read approximately 20 ohms resistance.
2. Transmission case electrical connector and harness electrical connector not seated.
3. EEC-IV processor malfunction:
a. Vacuum line disconnected from Manifold Absolute Pressure (MAP) sensor.
b. MAP sensor defective.
c. Throttle Position Sensor (TPS) defective.
d. Vehicle Speed Sensor (VSS) defective.
4. Improperly adjusted overdrive band.
5. Overdrive servo damaged or leaking.
6. Polished or glazed overdrive band or drum.
7. Contaminated or sticking 3-4 shift valve.
8. Contaminated or sticking 3-4 solenoid.