Toyota 4Runner: ECU Initial Setting Incomplete (C120A)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / 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 the vehicle is equipped with downhill assist control and/or crawl control.

DTC Code	DTC Detection Condition	Trouble Area
C120A	The master cylinder solenoid is not informed that the vehicle is equipped with downhill assist control or crawl control and downhill assist control or crawl control operates.	Calibration not performed

PROCEDURE

1.	PERFORM CALIBRATION

(a) Perform calibration (See page ).

NOTICE:

If a DTC is output after replacing the master cylinder solenoid, it is possible that calibration has not been performed or the zero point calibration data was not cleared when calibration was performed.

2.	CHECK FOR DTC

(a) Check for DTCs (See page ).

Result

Result	Proceed to
DTC C120A is output	A
DTC C120A is not output	B

END

3.	CHECK TEST MODE DTC

(a) Switch the vehicle to test mode, perform the downhill assist control switch or crawl switch signal check, and then check that DTC C1379 is cleared (See page ).

Result

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

GO TO DTC C1379

USE SIMULATION METHOD TO CHECK

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 sys ...

Zero Point Calibration of Yaw Rate Sensor Undone (C1210,C1336)

DESCRIPTION The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system. The yaw rate sensor has a built-in acceleration sensor and detects the ...

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