DTC C1783: Speed Signal Communication Error: Procedure

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

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → See step   4 

A: Go to next step 

1. 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. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → See step   5 

A: Go to next step 

1. Turn the power switch OFF.
2. Connect the Techstream to the DLC3.
3. Turn the power switch ON (IG) and the Techstream ON.
4. Enter the following menus: Chassis / Air suspension / Data List.
5. Using the Techstream, read the DATA LIST.
   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 (158 mph)	Actual vehicle speed	Speed indicated on combination meter
   FL Wheel Speed	Front left wheel speed reading / min.: 0 km/h (0 mph) max.: 255 km/h (158 mph)	Actual vehicle speed	Speed indicated on combination meter
   RR Wheel Speed	Rear right wheel speed reading / min.: 0 km/h (0 mph) max.: 255 km/h (158 mph)	Actual vehicle speed	Speed indicated on combination meter
   RL Wheel Speed	Rear left wheel speed reading / min.: 0 km/h (0 mph) max.: 255 km/h (158 mph)	Actual vehicle speed	Speed indicated on combination meter

   OK

   Vehicle speed indicated on the Techstream screen indicates the actual speed.

NG → See step   6 

OK → See step   7