Lexus ES: Linear Solenoid Circuit (C1298)
DESCRIPTION
The 4WD ECU assembly receives signals from each sensor to control clutch fluid pressure for limiting the center differential operation, which distributes torque according to the driving conditions.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1298 | Linear Solenoid Circuit | When all of the following continue for 1 second or more:
|
|
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | IG1 voltage is 9.5 V or more, the current requested by the 4WD linear solenoid (transmission coupling assembly) is 0 A. | ○ | - |
| IG1 voltage is 9.5 V or more, the current requested by the 4WD linear solenoid (transmission coupling assembly) is greater than 0.8 A. | - | ○ | |
| Malfunction Status | Short occurs in the 4WD linear solenoid circuit. | ○ | - |
| Open occurs in the 4WD linear solenoid circuit. | - | ○ | |
| Detection Time | 1 second or more | 1 second or more | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above is met.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (4WD ECU ASSEMBLY - TRANSMISSION COUPLING ASSEMBLY) |
| (a) Disconnect the G131 4WD ECU assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G131-2 (SLC+) - G131-1 (SLC-) | 20°C (68°F) | 2.2 to 2.6 Ω |
| G131-2 (SLC+) - Body ground | Always | 10 kΩ or higher |
| G131-1 (SLC-) - Body ground | Always | 10 kΩ or higher |
| OK | .gif) | REPLACE 4WD ECU ASSEMBLY |
.gif)
|
.gif)
| 2. | INSPECT TRANSMISSION COUPLING ASSEMBLY |
| (a) Disconnect the c1 4WD linear solenoid (transmission coupling assembly) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 1 (BSF) - 2 (SLC) | 20°C (68°F) | 2.2 to 2.6 Ω |
| 1 (BSF) - Body ground | Always | 10 kΩ or higher |
| 2 (SLC) - Body ground | Always | 10 kΩ or higher |
| OK | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| NG | | REPLACE TRANSMISSION COUPLING ASSEMBLY |
READ NEXT:
Cancellation of 4WD Control (C1299)
DESCRIPTION This DTC is output if the heat generated by the transmission coupling assembly exceeds a certain amount or if the estimated oil temperature of the transfer exceeds a certain amount while d
Diameter of the Tire is not Uniform (C1337)
DESCRIPTION The 4WD ECU assembly outputs this DTC if a difference in tire size is detected. DTC No. Detection Item DTC Detection Condition Trouble Area C1337 Diameter of the Tire is not
Calibration
CALIBRATION NOTICE:
Initial AWD functions such as acceleration are sometimes affected unless backup memory is cleared.
When the yaw rate and acceleration sensor (airbag ECU assembly) is replaced,
SEE MORE:
Reassembly
REASSEMBLY PROCEDURE 1. INSTALL LOWER POSITION INDICATOR HOUSING (a) Engage the 4 claws and 2 guides to install the lower position indicator housing to the shift lock control unit assembly. NOTICE: Do not damage the lower position indicator housing. 2. INSTALL SHIFT POSITION INDICATOR
Engine Failed to Start Mechanical Linkage Failure (P1C7779)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC is stored when the hybrid vehicle control ECU determines that the hybrid vehicle transaxle assembly has seized or that there is the hybrid vehicle transaxle assembly malfunction in the drivetrain. The cause of this malfunction may be one of the following:
