DTC C1783: Speed Signal Communication Error: Procedure

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Perform a road test.
3. Check for DTC. Refer to DTC CHECK / CLEAR . Check if DTC C1783 and U0122 are output.

   Result

   Condition	Proceed to
   Not output	A
   Output	B

B → See step   4 

A: Go to next step 

1. Check for DTC. Refer to DTC CHECK / CLEAR . Check if DTC C1783 and a brake control system speed sensor malfunction DTC (C0200/31, C0205/32, C0210/33, C0215/35, C1236/36, C1238/38 or C1239/39) are output.

   Result

   Condition	Proceed to
   Not output	A
   Output	B

B → See step   5 

A: Go to next step 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and the Techstream on.
4. Enter the following menus: Chassis / Air Suspension / Data List.
5. According to the display on the Techstream.
   AIR SUSPENSION
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   FR Wheel Speed	Front right wheel speed reading / min.: 0 km/h (0 mph) max.: 255 km/h (159 mph)	Actual vehicle speed	Speed indicated on speedometer
   FL Wheel Speed	Front left wheel speed reading/ min.: 0 km/h (0 mph) max.: 255 km/h (159 mph)	Actual vehicle speed	Speed indicated on speedometer
   RR Wheel Speed	Rear right wheel speed reading/ min.: 0 km/h (0 mph) max.: 255 km/h (159 mph)	Actual vehicle speed	Speed indicated on speedometer
   RL Wheel Speed	Rear left wheel speed reading/ min.: 0 km/h (0 mph) max.: 255 km/h (159 mph)	Actual vehicle speed	Speed indicated on speedometer

   OK

   Vehicle speed indicated on the Techstream indicates the actual speed.

NG → See step   6 

OK → See step   7