DTC U0401 [BCM]
id0902f5950500
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DESCRIPTION |
Receive erratic data from PCM |
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DETECTION CONDITION
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• BCM receives the erratic data from PCM for 5 s or more, while the ignition is ON.
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POSSIBLE CAUSE
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• PCM DTC is stored
• PCM malfunction
• BCM malfunction
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Diagnostic Procedure
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STEP |
INSPECTION |
ACTION |
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1
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CONFIRM PCM DTC
• Perform the PCM DTC inspection using the M-MDS.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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2
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CONFIRM BCM DTC
• Clear the DTC using the M-MDS.
(See CLEARING DTC [BCM].)
• Turn the ignition switch to the ON position and wait for 5 s or more.
• Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)
• Is the same DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to Step 4.
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3
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VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC using the M-MDS.
(See CLEARING DTC [BCM].)
• Turn the ignition switch to the ON position and wait for 5 s or more.
• Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)
• Is the same DTC present?
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Yes
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Replace the BCM, then go to the next step.
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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 NO OTHER DTCs ARE PRESENT
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [BCM].)
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No
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DTC troubleshooting completed.
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