P0725

DTC P0725 Engine Speed Input Circuit Malfunction





Circuit Description
The transaxle control module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its' control program. Based on this input information, the TCM controls various transaxle output functions and devices.
DTC's P0725, P0726 and P0727 are related to the same circuit. These DTC's will not illuminate the MIL, however, the DTC will be stored in memory.
Information transmit between TCM and ECM through the CAN line. information is as follows:
- Engine Malfunction Signal.
- Engine Speed.
- Engine Output Torque Reduction Signal.
- Engine Coolant Temperature.

Conditions for Setting the DTC
- The engine speed is greater than 7,000 rpm.
- System voltage is too high or too low.
- CAN transmitting wiring harness shorted or open.
- TCM or ECM is defective.
- Immediately after the above condition occurs.

Action Taken When the DTC Sets
- No lamp control required but diagnostic information should be stored immediately when malfunction is detected.
- Adopt Emergency / Substitute mode and constant 4th gear.
- Open lock up clutch.

Conditions for Clearing the MIL/DTC
- Using a scan tool can clear history DTCs.

Diagnostic Aids

Steps 1-10:

- Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
- Inspect the improperly formed or damaged terminals.