Toyota 4Runner: ECM Communication Circuit Malfunction (C1203)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / ECM Communication Circuit Malfunction (C1203)

DESCRIPTION

The circuit is used to send control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU via the CAN communication system.

DTC Code	DTC Detection Condition	Trouble Area
C1203	The engine/drivetrain specification and/or destination information from the ECM does not match the skid control ECU data.	ECM

PROCEDURE

1.	CHECK DTC (ENGINE CONTROL SYSTEM)

(a) Check if any DTC is recorded for the engine control system (See page ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

REPLACE ECM

GO TO ENGINE CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

Open in ABS Solenoid Relay Circuit (C0278,C0279)

DESCRIPTION The solenoid relay is built into the master cylinder solenoid. This relay supplies power to each solenoid. If the initial check is OK, after the ignition switch is turned to ON, the re ...

ECU Initial Setting Incomplete (C120A)

DESCRIPTION w/ Downhill Assist Control or w/ Crawl Control: When the master cylinder solenoid (skid control ECU) is replaced, the master cylinder solenoid (skid control ECU) must be informed that ...

Other materials about Toyota 4Runner:

Removal
REMOVAL PROCEDURE 1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ). 2. REMOVE NO. 2 DOOR INSIDE HANDLE BEZEL LH 3. REMOVE REAR DO ...

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Navigation System DTC Code Detection Item See page B1532 LVDS Signal Malfunction (from Extension Module) B1551 HD Radio Tuner ...