C1203

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1203/53: ECM Communication Circuit Malfunction

DTC C1203/53 - ECM Communication Circuit Malfunction

DESCRIPTION

The circuit is used to send TRAC and VSC control information (engine revolution signal) from the skid control ECU to the ECM (TRC+, TRC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTE: When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (Programming and Relearning).

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (ECM - SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector and ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. INSPECT ECM (E1 TERMINAL)

(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (E1 CIRCUIT)
OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY