DTC U0074, U0123, U1901SM2445168
DTC U0074, U0123, U1901

id040200887600

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.
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.
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.
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.
No
Replace the combined sensor, then go to the next step.
(See COMBINED SENSOR REMOVAL/INSTALLATION [MTX].)
(See COMBINED SENSOR REMOVAL/INSTALLATION [ATX].)
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.)
• Are the same DTCs present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)
(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
5
VERIFY THAT NO OTHER DTCS ARE PRESENT
• Are any other DTCs output?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.