Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Engine Circuit Malfunction (C1280)
DESCRIPTION
If a malfunction in the ECM circuit is detected, the 4WD ECU assembly stores this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1280 | Engine Circuit Malfunction | When the following continues for 5 seconds or more:
|
|
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.
Click here .gif)
HINT:
Check the condition of each related circuit connector before troubleshooting.
Click here
PROCEDURE
| 1. | CHECK FOR DTC (SFI SYSTEM) |
(a) Check if SFI system DTCs are output.
Click here
| Result | Proceed to |
|---|---|
| SFI system DTCs are not output | A |
| SFI system DTCs are output | B |
| A | .gif) | REPLACE 4WD ECU ASSEMBLY |
| B | | GO TO SFI SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) |
Low or High Power Supply Voltage (C1241)
DESCRIPTION If a malfunction in the power source circuit occurs, or a communication malfunction with the skid control ECU (brake actuator assembly) or speed sensor occurs, the 4WD ECU assembly prohibi ...
ABS Malfunction (C1296)
DESCRIPTION If a malfunction in the speed sensor signal circuit or acceleration sensor (airbag sensor assembly*1 or yaw rate sensor assembly*2) circuit is detected, the 4WD ECU assembly stores this DT ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Throttle Body: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (a) Before cleaning, or after cleaning the throttle body with motor assembly and installing it to the vehicle, turn the engine switch on (IG) without operating the accelerator pedal sensor assembly. NOTICE: If the accelerat ...
Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Front Power Seat Control System (w/ Memory): Power Seat Power Easy Access System Function does not Operate
DESCRIPTION
The seat slides backward when either of the following conditions is met:
The driver seat belt is unfastened with the engine switch off and the shift lever in P.
The engine switch is turned from on (IG) or on (ACC) to off with the shift lever in P and the driver seat belt unfasten ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0093