P0734

DTC P0734 Gear 4 Incorrect Ratio

Circuit Description
The TCM uses transaxle input speed information and output speed sensor to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage. Conditions for Setting the DTC.

Conditions for Setting the DTC
- Time since TCM reset is greater than 500 msec.
- Time since shift end is greater than 500 msec.
- Transmission oil temperature is greater than -10°C (14°F).
- System voltage is greater than 9 volts.
- No input speed error DTCs P0715, P0716, and P0717.
- Output speed is greater than 256 rpm.
- Input speed is greater than 400 rpm.
- No gear shift active.

Action Taken When the DTC Sets
- Hold lamp will blink.
- The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
- Adopt Emergency/ Substitute mode and constant 4th gear by hydraulic control. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
- High line pressure

Conditions for Clearing the MIL/DTC
- The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- Using a scan tool can clear history DTCs.

Diagnostic Aids

Steps 1-4:

Steps 4 (continued)-7:

- Check for intermittent input speed sensor or output speed sensor circuit problems.
- Check for possible incorrect calibration.