Powertrain Malfunction (Wrench)/Service Warning Indicator

The powertrain malfunction (wrench)/service warning indicator is used to inform the driver that an oil change is required and to inform the driver if a powertrain fault is present in the PCM or TCM.

For powertrain faults, the IPC uses 2 messaged inputs to control the powertrain malfunction (wrench) indicator. The IPC receives the engine warning indication message from the PCM over the HS-CAN. The second input is the transmission fault indication message, sent to the IPC over the HS-CAN from the TCM. When a fault occurs in the Electronic Throttle Control (ETC) or the transmission, the PCM or TCM sends a message to the IPC to illuminate the powertrain malfunction (wrench) indicator.