Lexus RX (RX 350L, RX450h) 2016-2025 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.
Click here
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 |
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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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