Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Linear Solenoid Circuit (C1298)
DESCRIPTION
The 4WD ECU assembly receives signals from each sensor. The signals are used to control the clutch fluid pressure to vary the distribution of torque in accordance with 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:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.
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HINT:
Check the condition of each related circuit connector before troubleshooting.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (4WD ECU ASSEMBLY - ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY) |
(a) Disconnect the R10 4WD ECU assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| R10-2 (SLC+) - R10-1 (SLC-) | 20°C (68°F) | 1.75 to 2.15 Ω |
| R10-2 (SLC+) - Body ground | Always | 10 kΩ or higher |
| R10-1 (SLC-) - Body ground | Always | 10 kΩ or higher |
| OK | .gif) | REPLACE 4WD ECU ASSEMBLY |
|
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| 2. | INSPECT ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY |
| (a) Disconnect the T4 4WD linear solenoid (electro magnetic control coupling sub-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) | 1.75 to 2.15 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 ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY |
Steering Angle Sensor (C1297)
DESCRIPTION The 4WD ECU assembly determines that the vehicle is turning based on the signals sent from the steering sensor. The steering sensor signal is sent to the 4WD ECU assembly via CAN communica ...
Cancellation of 4WD Control (C1299)
DESCRIPTION This DTC is stored if the heat generated by the transmission coupling assembly exceeds a certain amount or the estimated oil temperature of the transfer exceeds a certain amount while driv ...
Other materials:
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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