DTC U1901 [DSC/RSC]
id0402b3811700
DTC
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U1901
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SAS control module system (CAN2 line malfunction)
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DETECTION CONDITION
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• The signal from the SAS control module is not within specification.
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POSSIBLE CAUSE
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• SAS control module malfunction
• Open or short circuit in the CAN2_L wiring harness between SAS control module terminal 2D and DSC/RSC HU/CM terminal M
• Open or short circuit in the CAN2_H wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P
• DSC/RSC HU/CM malfunction
• Poor connection at connectors (female terminal)
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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INSPECT SAS CONTROL MODULE MALFUNCTION
• Turn the ignition switch off.
• Using the M-MDS, perform the DTC inspection for the SAS control module.
(See DTC DISPLAY.)
• Are any DTCs detected?
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Yes
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Go to applicable DTC inspection.
(See DTC TABLE.)
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No
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Go to the next step.
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2
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INSPECT SAS CONTROL MODULE SIGNAL (CAN2 LINE) FOR OPEN CIRCUIT
• Disconnect the DSC/RSC HU/CM connectors.
• Disconnect the SAS control module connectors.
• Inspect for continuity between the DSC/RSC HU/CM connectors (vehicle harness-side) and the following SAS control module connector terminals (vehicle harness-side):
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness, then go to Step 4.
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3
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INSPECT SAS control module SIGNAL (CAN2 LINE) FOR SHORT CIRCUIT
• Inspect for continuity between the following DSC/RSC HU/CM connector terminals (vehicle harness-side) and body ground:
• Is there continuity?
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Yes
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Repair or replace the wiring harness, then go to Step 4.
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No
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Go to the next step.
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4
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VERIFY THAT THE SAME DTC IS NOT PRESENT
• Clear the DTCs from the memory.
(See ON-BOARD DIAGNOSIS [DSC/RSC].)
• Are the same DTCs present?
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Yes
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Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC/RSC HU/CM, then go to the next step.
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No
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Go to the next step.
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5
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VERIFY THAT NO OTHER DTCS ARE PRESENT
• Are any other DTCs output?
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Yes
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Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [DSC/RSC].)
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No
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DTC troubleshooting completed.
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