Up to 08/2009

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1783: Speed Signal Communication Error
C1783 - Speed Signal Communication Error

DESCRIPTION

The suspension control ECU receives wheel speed sensor signals via the CAN communication system from the skid control ECU.





INSPECTION PROCEDURE

NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first C1782.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation How To Proceed With Troubleshooting; 2) DTC inspection Reading and Clearing Diagnostic Trouble Codes; and 3) Techstream inspection (Data List or Active Test) Scan Tool Testing and Procedures. If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification information must be performed Calibration and Registration)
PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check the CAN communication system for any malfunctions Diagnosis System.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check if the VSC system outputs any DTC relevant to speed sensors Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- GO TO VEHICLE STABILITY CONTROL SYSTEM Vehicle Stability Control System

A -- REPLACE SUSPENSION CONTROL ECU