P1602 Toyota ECU-TCU Communication Error
Possible causes
– Faulty Transaxle Control Module(TCM) or Engine Control Module(ECM)
– Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted
– Transaxle Control Module(TCM) to Engine Control Module(ECM) circuit poor electrical connection
– Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted
– Transaxle Control Module(TCM) to Engine Control Module(ECM) circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1602 Toyota Description
A communication line exists between the Engine Control Module(ECM) and the Transaxle Control Module(TCM). The communication is through a Control Area Network(CAN). Without CAN communication, an independent pin and wiring is needed to receive a sensor information from a ECM. The more information to be communicated, the more wirings is required. In case of CAN communication type, all the information need to be communicated among control modules such as ECM and TCM use CAN lines.
Toyota Vehicle:Toyota Prius,Toyota Celica,Toyota Supra,Toyota Carina,Toyota Camry,Toyota MR2,Toyota Aygo,Toyota 4Runner,Toyota Avalon,Toyota Camry,Toyota Corolla,Toyota FJ Cruiser,Toyota Highlander,Toyota Land Cruiser,Toyota Matrix,Toyota Prius,Toyota RAV4,Toyota Sequoia,Toyota Sienna,Toyota Solara,Toyota Tacoma,Toyota Tundra,Toyota Yaris,