DTC U0074, U0123, U1901 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2887600

DTC

U0074, U0123, U1901

Combined sensor system (CAN2 line malfunction)

DETECTION CONDITION

•  U0074

―  Communication error with combined sensor is detected in CAN communication.

•  U0123

―  Error is detected in received data from combined sensor in CAN communication.

•  U1901

―  Error is detected in transmitted data to combined sensor in CAN communication.

FAIL-SAFE

•  U0074, U1901

―  Inhibits TCS control and DSC control, and illuminates indicator light.

•  U0123

―  Inhibits TCS control and DSC control, and illuminates indicator light.
(If error is detected during a TCS control, inhibits TCS control after finishing the control.)

POSSIBLE CAUSE

•  Open or short circuit in the CAN2_L wiring harness between combined sensor terminal B and DSC HU/CM terminal AS

•  Open or short circuit in the CAN2_H wiring harness between combined sensor terminal C and DSC HU/CM terminal AR

•  Combined sensor malfunction

•  DSC HU/CM malfunction

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT COMBINED SENSOR SIGNAL (CAN2 LINE) FOR OPEN CIRCUIT • Disconnect the DSC HU/CM connectors. • Disconnect the combined sensor connectors. • Inspect for continuity between the DSC HU/CM connectors (vehicle harness-side) and the following combined sensor connector terminals (vehicle harness-side): ― Combined sensor (CAN2_L): B—AS ― Combined sensor (CAN2_H): C—AR • Is there continuity?	Yes	Go to the next step.
1		No	Repair or replace the wiring harness, then go to Step 4.
2	INSPECT COMBINED SENSOR SIGNAL (CAN2 LINE) FOR SHORT CIRCUIT • Inspect for continuity between the following DSC HU/CM connector terminals (vehicle harness-side) and body ground: ― Combined sensor (CAN2_L): B ― Combined sensor (CAN2_H): C • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 4.
2		No	Go to the next step.
3	INSPECT THE COMBINED SENSOR • Reconnect all disconnected connectors. Inspect the combined sensor. (See COMBINED SENSOR INSPECTION.) • Is the combined sensor normal?	Yes	Go to the next step.
3		No	Replace the combined sensor, then go to the next step. (See COMBINED SENSOR REMOVAL/INSTALLATION.)
4	VERIFY THAT THE SAME DTC IS NOT PRESENT • Make sure to reconnect all disconnected connectors. • Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Are the same DTCs present? (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
5		No	DTC troubleshooting completed.

DTC	U0074, U0123, U1901		Combined sensor system (CAN2 line malfunction)
DETECTION CONDITION		• U0074 ― Communication error with combined sensor is detected in CAN communication. • U0123 ― Error is detected in received data from combined sensor in CAN communication. • U1901 ― Error is detected in transmitted data to combined sensor in CAN communication.
FAIL-SAFE		• U0074, U1901 ― Inhibits TCS control and DSC control, and illuminates indicator light. • U0123 ― Inhibits TCS control and DSC control, and illuminates indicator light. (If error is detected during a TCS control, inhibits TCS control after finishing the control.)
POSSIBLE CAUSE		• Open or short circuit in the CAN2_L wiring harness between combined sensor terminal B and DSC HU/CM terminal AS • Open or short circuit in the CAN2_H wiring harness between combined sensor terminal C and DSC HU/CM terminal AR • Combined sensor malfunction • DSC HU/CM malfunction • Poor connection at connectors (female terminal)