C1782

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1782: Power Source Voltage Malfunction
C1782 - Power Source Voltage Malfunction

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- Even if DTC C1781 is stored at the same time, perform the inspection for DTC C1782 first.
- Before performing troubleshooting, inspect the connectors of related circuits.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG 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 / AHC / Data List.

(e) According to the display on the Techstream, read the Data List.

AHC





OK:

11 to 14 V

NG -- CHECK HARNESS AND CONNECTOR (BATTERY - ECU AND BODY GROUND)
OK -- Continue to next step.

2. RECONFIRM DTC OUTPUT

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

(b) Check for DTCs.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM (+B POWER SOURCE VOLTAGE, +B2 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 / AHC / Data List.

(e) According to the display on the Techstream, read the Data List.

AHC





OK:

11 to 14 V

NG -- INSPECT FUSE (AHC-B, AHC-B NO. 2)

OK -- REPLACE SUSPENSION CONTROL ECU Removal

4. INSPECT FUSE (AHC-B, AHC-B NO. 2)

(a) Remove the AHC-B and AHC-B No. 2 fuses from the cowl side junction block RH.

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

Standard Resistance:





NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (BATTERY - SUSPENSION CONTROL ECU)

(a) Disconnect the K30 and K31 ECU connectors.

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





Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SUSPENSION CONTROL ECU Removal

6. CHECK HARNESS AND CONNECTOR (BATTERY - ECU AND BODY GROUND)

(a) Disconnect the K30 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 -- REPLACE SUSPENSION CONTROL ECU Removal