Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2009GS 350 RWD V6-3.5L (2GR-FSE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONC CODE CHARTSC1940
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)
C1940
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)SECTION C1940
SUSPENSION CONTROL: ACTIVE STABILIZER SUSPENSION SYSTEM: C1940: Front Yaw Rate Sensor
DTC C1940 - Front Yaw Rate Sensor
DTC C1941 - Front Acceleration Sensor
DTC C1942 - Malfunction in Signal from Steering Sensor to Front Active Stabilizer Control ECU
DTC C1943 - Front Vehicle Speed Signal
DTC C1946 - Malfunction in Signal from Steering Control ECU to Front Active Stabilizer Control ECU
DESCRIPTION
The active stabilizer suspension system uses CAN communication to gather information necessary for control functions. When a malfunction occurs in another system, DTCs C1940, C1941, C1942, C1943 and C1946 are stored.
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DTC
(a) Check for DTC Active Stabilizer Suspension System.
OK:
DTCs other than C1940, C1941, C1942, C1943 and C1946 are not output
NG -- CHECK FLOWCHART OF EACH DTC
OK -- Continue to next step.
2. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU
(a) Turn the engine switch off.
(b) Exchange the rear active stabilizer control ECU with the front active stabilizer control ECU.
(c) Connect Techstream to the DLC3.
(d) Turn the engine switch on (IG) and press the Techstream main switch ON.
(e) Clear the DTC Active Stabilizer Suspension System.
(f) Check for DTC.
Result
B -- CHECK INTERMITTENT PROBLEMS
A -- REPLACE FRONT ACTIVE STABILIZER CONTROL ECU
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.