P0115

DTC P0115

Circuit Description
The powertrain control module (PCM) sends engine coolant temperature data to the transmission control module (TCM). The TCM uses this data to initiate warm-up shift patterns and to establish default transmission fluid temperature (TFT) values. The data is sent to the TCM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the PCM and TCM. A fault in the CAN will not cause DTC P0115 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P0115.

When the TCM receives invalid engine coolant temperature data from the PCM, then DTC P0115 will set. DTC P0115 is a type C DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC P0115 Engine Coolant Temperature (ECT) Sensor Circuit

Conditions for Running the DTC
^ The ignition voltage is 10.2 - 15.5 volts.
^ The engine run time is 3 seconds or greater.
^ No CAN DTC U0100.
^ Trans. Protection Mode is OFF.
^ The engine speed is 400 RPM or greater.

Conditions for Setting the DTC
The PCM sends no valid engine coolant temperature data to the TCM for 4 seconds.

Action Taken When the DTC Sets
^ The TCM uses 80°C (176°F) as a default engine coolant temperature value.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Record.
^ The TCM stores DTC P0115 in TCM history.

Conditions for Clearing the MIL/DTC

Step 1 - Step 7:

^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.