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Home >> Scion >> 2004 >> xB Standard >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> 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 (TRC+, TRC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).

DTC C1203/53 REFERENCE

DTC No. DTC Detecting 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 continues 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.
  • When the data about engine, drive system, and user country from ECM are not match up to skid control ECU.
  • TRC+ or TRC- circuit
  • ENG+ or ENG- circuit
  • CM
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