C1938

SUSPENSION CONTROL: ACTIVE STABILIZER SUSPENSION SYSTEM: C1938: Malfunction in Front Active Stabilizer Control ECU Short Relay Power Supply IC
C1938 - Malfunction in Front Active Stabilizer Control ECU Short Relay Power Supply IC

DESCRIPTION

When a malfunction is detected in the motor short relay power supply IC of the front active stabilizer control ECU, DTC C1938 is output.





INSPECTION PROCEDURE

PROCEDURE

1. INTERCHANGE FRONT AND REAR ACTIVE STABILIZER CONTROL ECU

(a) Turn the power switch OFF.

(b) Interchange the front active stabilizer control ECU with the rear active stabilizer control ECU, and install them securely.

HINT
- Interchange the front and rear active stabilizer control ECUs and check for DTCs. After interchanging the ECUs, if a rear stabilizer DTC is displayed, it can be determined that the front active stabilizer control ECU is malfunctioning. If no DTC is output, the front active stabilizer control actuator is malfunctioning.
- For the ECU removal and installation procedures, refer to the front ECU procedures Removal or the rear ECU procedures Removal.

NEXT -- Continue to next step.

2. CLEAR DTC

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream on.

(d) Clear the DTC Active Stabilizer Suspension System.

NEXT -- Continue to next step.

3. CHECK OPERATION OF FRONT ACTIVE STABILIZER CONTROL ECU

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (READY) and wait 30 seconds or more. Then check for rear stabilizer DTCs Active Stabilizer Suspension System.

OK:

DTC C1912 is not output

NG -- REPLACE FRONT ACTIVE STABILIZER CONTROL ECU Removal

OK -- REPLACE FRONT ACTIVE STABILIZER CONTROL ACTUATOR ASSEMBLY Removal