BR–155 BRAKE SYSTEM – TRACTION CONTROL SYSTEM (TRAC) DTC 51 Engine Malfunction Detection Circuit CIRCUIT DESCRIPTION If trouble in the engine control system causes the malfunction indicator light to light up, this information is transmitted from the ECM to the TRAC ECU. The TRAC ECU may prohibit TRAC control as a result. DTC No. | Diagnostic Trouble Code Detecting Condition | Trouble area 51 | Conditions (1) and (2) continue for more than 1 sec.: (1) Engine speed: 500 rpm or more (2) Malfunction information is input from the ECM. | Engine control system INSPECTION PROCEDURE 1 Check the diagnostic trouble code for the engine (See page EG–491). Malfunction indicator light remains ON. | Output NG code | Repair engine control system according to the code output. Check for short in all the harness and ECU connected to malfunction indicator light.