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Home >> Scion >> 2005 >> xA Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> Abs With EBD & BA & TRAC & VSC System >> DTC C1203/53: ECM Communication Circuit Malfunction >> Circuit Description

Circuit Description

This circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (VSC+, VSC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).

DTC CONDITION DETECTION

DTC No. DTC Detection Condition Trouble Area
C1203/53
  • When IG1 terminal voltage is 9.5 V or more, the condition that the data is not transmitted to ECM continue for more than 5 sec.
  • When ECU IG1 terminal voltage is 9.5 V or more and the engine speed is 500 rpm or more, data reception from the ECM is impossible for 5 sec. or more.
  • The condition that data transmission and reception to/from
  • ECM is impossible once or more within 5 sec. repeatedly occurs.
  • The data about engine, drive system, and user country from ECM are not the same as skid control ECU.
  • VSC+ or VSC- circuit
  • ENG+ or ENG- circuit
  • ECM
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