BR–153 BRAKE SYSTEM – TRACTION CONTROL SYSTEM (TRAC) INSPECTION PROCEDURE HINT: The sub–throttle position sensor signal is transmitted to the TRAC ECU from ECM, so if an error occurs at the engine side, the TRAC ECU also detects it. If diagnostic trouble code No. 47 is being output for the engine, troubleshoot the engine first. 1 Is diagnostic trouble code output for the engine? Do diagnostic trouble code check on page EG–491. NO YES Repair circuit indicated by the code output. 2 Check voltage between terminal IDL2 of TRAC ECU and body ground. Engine condition ON P 1. Remove TRAC ECU with connectors still connected. 2. Remove intake air duct. 3. Disconnect step motor connector. 4. Turn ignition switch ON. C Measure voltage between terminal IDL2 of TRAC ECU and body ground, when the sub–throttle valve is fully closed and fully open. OK Sub–throttle valve position | Voltage Fully closed | Below 1.0 V Fully open | 10 – 14 V IDL2 RO6986 BE6853 RO6993 NG OK Go to step 6.