Toyota 4Runner: Control Module Communication Bus OFF (U0073,U0100,U0114,U0123,U0124,U0126)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Control Module Communication Bus OFF (U0073,U0100,U0114,U0123,U0124,U0126)

DESCRIPTION

DTC Code	DTC Detection Conditions	Trouble Area
U0073	One of the following conditions is met: When the IG1 terminal voltage is between 10 and 17.4 V, after the output of data from the skid control ECU is completed, the sending operation continues for 5 seconds or more. The condition that bus OFF state occurs once or more within 0.1 seconds occurs 10 times in succession (Sent signals cannot be received). When the IG1 terminal voltage is between 10 and 17.4 V, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession. The condition that a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor occurs more than once within 5 seconds.	CAN communication system
U0100	Either condition is met: When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed 15 km/h (9 mph) or more, data cannot be sent to the ECM for 2 seconds or more. When the IG1 terminal voltage is between 10 and 17.4 V and the vehicle speed 15 km/h (9 mph) or more, data cannot be received to the ECM for 2 seconds or more.
U0114	The CAN signal from the four wheel drive control ECU is lost or malfunctioning for 1.2 seconds.
U0123	Either condition is met: When the IG1 terminal voltage is between 10 and 17.4 V, data from the yaw rate sensor cannot be received for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession. The condition that data from the yaw rate sensor cannot be received occurs once or more within 5 seconds.
U0124	Either condition is met: When the IG1 terminal voltage is between 10 and 17.4 V, data from the acceleration sensor cannot be received for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession. The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.
U0126	One of the following conditions is met: When the IG1 terminal voltage is between 10 and 17.4 V, data from the steering angle sensor cannot be received for 1 second or more. When the IG1 terminal voltage is between 10 and 17.4 V, the following occurs 10 times in succession. The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.

PROCEDURE

1.	RECONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Check if the same DTCs are output (See page ).

Result

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

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

USE SIMULATION METHOD TO CHECK

Reservoir Level Switch Disconnected (C1453,C1454)

DESCRIPTION The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake fluid level drops. DTC Code DTC Detection Condition ...

ABS Warning Light Remains ON

DESCRIPTION If any of the following is detected, the ABS warning light remains on. The skid control ECU connectors are disconnected from the skid control ECU. There is a malfunction i ...

Other materials about Toyota 4Runner:

Removal
REMOVAL PROCEDURE 1. REMOVE FRONT WHEEL 2. REMOVE SIDE STEP ASSEMBLY LH 3. REMOVE STABILIZER CONTROL VALVE PROTECTOR 4. DRAIN SUSPENSION FLUID 5. REMOVE LOWER FRONT BUMPER COVER 6. REMOVE NO. 1 ENGINE UNDER COVER SUB-ASSEMBLY 7. REMOVE F ...

Inspection
INSPECTION PROCEDURE 1. INSPECT TRANSFER INPUT SHAFT (a) Using a micrometer, measure the diameter of the input shaft journal. Minimum diameter: 47.59 mm (1.88 in.) If the diameter is less than the minimum, replace the input shaft. (b) Usin ...