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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 engine control module receives invalid or no vehicle speed signal via CAN, the KOS&OSS-ECU will set DTC B1138.
 
 
DTC SET CONDITION
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 engine control module.
    • The system receives invalid vehicle speed signal from the engine control module.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the CAN bus line
  • Malfunction of engine control module
  • Malfunction of KOS&OSS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Check if KOS&OSS-ECU DTC B1156 is set.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the DTC set?
Refer to diagnostic trouble code chart .
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the other system diagnostic trouble code.
Check again if the DTC is set in the engine control module.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Erase the DTC.
(3) Turn the power supply mode of the engine switch to "ON".
(4) Check if DTC is set.
(5) Turn the power supply mode of the engine switch to "OFF".
Is the DTC set?
Perform troubleshooting for the engine control module (Refer to GROUP 13A, Troubleshooting ). Then go to Step 4.
Go to Step 4.
 
STEP 4. Recheck for diagnostic trouble code.
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 to "ON".
(3) Check if DTC is set.
Is the DTC set?
Replace the KOS&OSS-ECU and register the VIN (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).