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 ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Hood: Components
COMPONENTS ILLUSTRATION *1 HOOD INSULATOR *2 HOOD TO RADIATOR SUPPORT SEAL *3 WASHER HOSE ASSEMBLY *4 WASHER NOZZLE SUB-ASSEMBLY *5 HOOD INSULATOR CLIP *6 HOOD TO RADIATOR SUPPORT SEAL CLIP ● Non-reusable part - - ILLUSTRATION *1 HOOD STAY BRACKET L ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Can Communication System: Check Bus 4 Lines for Short Circuit
DESCRIPTION There may be a short circuit between the bus 4 main lines and/or bus 4 branch lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the network gateway ECU is below 54 Ω. Symptom Trouble Area Resistance between terminals 22 (CA2H) and 7 (CA2L) of network gateway ...
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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