Up to 08/2009

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 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)
HINT
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG AND +B POWER SOURCE VOLTAGE)

(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 system





OK:

11 to 14 V

Result:





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

2. CHECK BATTERY

(a) Measure the battery voltage.

Standard voltage:





NG -- GO TO CHARGING SYSTEM Component Tests and General Diagnostics
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF ECU)

(a) Disconnect the A56 ECU connector.





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

Standard voltage:





Text in Illustration





(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK DTC

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

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

Result:





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

A -- REPLACE SUSPENSION CONTROL ECU