Lexus RX (RX 350L, RX450h) 2016-2025 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.
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HINT:
Check the condition of each related circuit connector before troubleshooting.
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PROCEDURE
| 1. | CHECK FOR DTC (SFI SYSTEM) |
(a) Check if SFI system DTCs are output.
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| 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 ...
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Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Crankshaft Oil Seal: Removal
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DESCRIPTION If an ECU or sensor is not displayed on the CAN Bus Check screen of the Techstream and some ECUs and sensors repeatedly appear and disappear from the screen when the CAN main bus lines are normal (there is no open, short, short to +B or short to GND in the main bus lines), there may be a ...
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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