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DTC B1138 Vehicle speed data fail
 
 
caution
  • If DTC B1138 is set, diagnose the CAN bus lines.
  • If DTC B1138 is set, check whether DTC B1156 is also set.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSIS FUNCTION
When the ECM receives invalid or no vehicle speed signal via CAN, the KOS&OSS-ECU will set DTC B1138.
 
 
JUDGMENT CRITERIA
Check Conditions
  • The power supply mode is at "ON" without cranking.
Judgment Criterion
  • Any of the following conditions is met, and two seconds or more have elapsed.
    • The system does not receive any vehicle speed signal from the ECM.
    • The system receives invalid vehicle speed signal from the ECM.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Malfunction of ECM
  • Malfunction of KOS&OSS-ECU
  • Malfunction of ASC-ECU
  • Defective vehicle speed sensor
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line
Use the scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the DTC.
Check whether the KOS&OSS-ECU sets DTC B1156.
Is the DTC set?
Refer to Diagnostic trouble code chart .
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check the other system DTC.
(1) Check that the vehicle power can be turned "ON" and engine is started.
(2) Check the DTC of ECM.
Is the DTC set?
Troubleshoot the ECM (Refer to GROUP 13A - Diagnosis ). Then go to Step 4.
Go to Step 4.
 
STEP 4. Check whether the DTC is set again.
Check again if the DTC is set in the KOS&OSS-ECU.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from "OFF" to "ON."
(3) On completion, check that the DTC is not set again.
Is the DTC set?
Replace the KOS&OSS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).