INSPECTION PROCEDURE P-22: The vehicle speed signal is not received.


caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM
The vehicle speed signal is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Windshield wiper and washer (vehicle speed-dependent wiper function)
  • Door ajar warning buzzer function
  • Door ajar indicator lamp

POSSIBLE CAUSES

  • Malfunction of the vehicles speed sensor
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2 .
Repair the CAN bus line (Refer to GROUP 54F - Troubleshooting ).

Step 2. Check for combination meter diagnosis code.
Check whether the combination meter-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the combination meter (Refer to GROUP 54A - Combination meter ).
Go to Step 3 .

Step 3. ETACS ANALOG data by using the SWS monitor.

  • Enter a simulated vehicle speed.
Item No.
 Item name
 Normal conditions
Item 03
 SPEED SENSOR
 Displays the speed which fluctuates within ± 2 km/h from the entered vehicle speed.
OK: Normal condition is displayd.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.