DTC P0734: Incorrect 4TH Gear Ratio: Condition
NOTE:
If DTCs P0716, P0717, P0748 or P1500 are displayed on scan tool, diagnose these DTCs prior to DTC P0734.
Shift solenoids "A", "B" and "C", VSS, input/turbine speed sensor and TFT sensor function normally and vehicle speed is 44-65 MPH in 4th gear. Input/turbine speed sensor and VSS signals indicate that gear ratio is above set value. Possible causes:
- Low ATF level.
- Low hydraulic pressure.
- Control valve stuck.
- Solenoid valve malfunction.
- TCM malfunction.
- 2-4 brake band and 3-4 clutch slippage.
- Pressure control solenoid valve malfunction.
- Input/turbine speed sensor malfunction.
- VSS malfunction.
- Damaged wiring between ECM and TCM.