Lexus ES: Suspension Control ECU Malfunction (C1781)
DESCRIPTION
If a malfunction in the absorber control ECU is detected, DTC C1781 is stored.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory |
C1781 | Suspension Control ECU Malfunction | One of the following conditions is met: -
A nonvolatile memory write or read error occurs.
-
A CAN communication register is stuck.
-
An overheat protection function malfunction occurs.
| -
Absorber control ECU
-
CAN communication system
| Does not come on | Yes |
CAUTION / NOTICE / HINT
NOTICE:
-
Before performing troubleshooting, inspect the connectors of related circuits.
-
Before replacing the absorber control ECU, perform all of the following:
-
Symptom simulation.
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-
DTC inspection.
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-
Techstream inspection.
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-
If no malfunctions are found in other areas, replace the absorber control ECU.
-
After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.
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PROCEDURE
1. | CHECK FOR DTCS (CAN COMMUNICATION SYSTEM) |
(a) Check for DTCs.
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Chassis > Air suspension > Trouble Codes
Result | Proceed to |
CAN DTCs are not output | A |
CAN DTCs are output | B |
A | | REPLACE ABSORBER CONTROL ECU |
B | | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
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CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the heated steering wheel system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT BATTERY VOLTAGE (a) Measure the battery voltage with the engine switch off.
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