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Home >> Lexus >> 2005 >> RX 330 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 450 (Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics)) >> Abs With EBD & BA & TRAC & VSC System >> DTC C1203/53: ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (ENG+, ENG-, TRC+, TRC- OF ECM AND SKID CONTROL ECU) (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    1. Check for an open or short circuit in harness and connector between the ECM and skid control ECU.
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 
  2. CHECK HARNESS AND CONNECTOR (E1 OF ECM AND BODY GROUND) 
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: REPLACE ECM (See  REPLACEMENT  ) 
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