DTC P1934 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6222600

DTC P1934

CAN signal for vehicle speed not valid
DETECTION CONDITION
•  The PCM monitors the vehicle speed signal input via CAN from the DSC HU/CM.If the vehicle speed data in CAN signal from the DSC HU/CM is invalid for 0.5 s, the PCM determines that the vehicle speed signal is invalid.
POSSIBLE CAUSE
•  PCM malfunction
•  DSC HU/CM system malfunction
•  ABS wheel speed sensor malfunction
•  DSC HU/CM malfunction
•  Communication error between DSC HU/CM and PCM

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY STORED DTC IN DSC HU/CM
•  Retrieve the DSC HU/CM DTC using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
No
Go to the next step.
4
VERIFY STORED CAN COMMUNICATION DTC IN PCM AND DSC HU/CM
•  Retrieve the PCM and DSC HU/CM DTC using the M-MDS.
•  Is the CAN communication DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
No
Go to the next step.
5
INSPECT ABS WHEEL-SPEED SENSOR CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the ABS wheel-speed sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 7.
No
Go to the next step.
6
INSPECT ABS WHEEL-SPEED SENSOR
•  Inspect the ABS wheel-speed sensor and pulse wheel.
•  Is there any malfunction?
Yes
Replace the ABS wheel-speed sensor and/or pulse wheel, then go to the next step.
(See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
(See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
No
Go to the next step.
7
VERIFY THAT DTC P1934 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
DTC troubleshooting completed.