Electronic control fuel injection system (Common rail type) 1E-23 About scan tool (Tech2) This is an useful tool to diagnose the electric faults and the system check of the engine control system. The Tech2 is small and light tester. It can communicate with each control unit to perform various types of diagnosis and test by connecting it to DLC equipped to the machine using Tech2 adapter. ECM control DTC Sensor output Data Link Connector Read DTC Actuator Test Snapshot TSWG0121 V V RPM RPM V V %