P0782

DTC P0782 2-3 Shift Malfunction

Circuit Description
The special feature of 4HP 16 Auto Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.
The advantage of overlap shifting are as follows:
- The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
- Lower drag losses, i.e. higher efficiency.
- Lower peak torque acting on the components and driveline.
However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

Conditions for Setting the DTC
- Transmission oil temperature is greater than -10°C (14°F).
- Selector lever is not N (Neutral), P (Park) position.
- 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. 2-3 gear shift is active.
- Immediately after the above condition occurs.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- 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 2nd gear.
- Open lock up clutch.

Conditions for Clearing the MIL/DTC
- The MIL 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 1-3:

Steps 4-6:

- When DTC P0782 sets, the possible cause of fault could be TCM.