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Home >> Lexus >> 2004 >> GX 470 >> 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

The 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-).

DIAGNOSTIC TROUBLE CODE

DTC No. DTC Detecting Condition Trouble Area
C1203/53 Either of the following 1. or 2. continues for 5 sec:
  1. ECU IG1 terminal voltage is 9.5 V to 17.0 V and data transmission to the ECM is impossible.
  2. ECU IG1 terminal voltage is 9.5 V to 17.0 V, engine speed is 500rpm or more or vehicle speed is 60 km/h (36 mph) or more and data receiving from the ECM is impossible.
  • TRC+ or TRC-circuit
  • ENG+ or ENG- circuit
  • ECM
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