C1782

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1782: Power Source Voltage Malfunction
C1782 - Power Source Voltage Malfunction

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Electronic Circuit Inspection Procedure; 2) DTC inspection; and 3) Techstream inspection (Data List or Active Test). If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.

PROCEDURE

1. CHECK IG VOLTAGE (DATA LIST)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Air suspension / Data List.

(e) According to the display on the Techstream.

Air suspension





OK:

11 to 14 V

Result





B -- CHECK DTC
A -- Continue to next step.

2. CHECK BATTERY VOLTAGE

(a) Disconnect the L88 ECU connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION Testing and Inspection
OK -- Continue to next step.

3. CHECK DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTC Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE SUSPENSION CONTROL ECU Removal

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting