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
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 | ![]() | REPLACE 4WD ECU ASSEMBLY |
B | ![]() | GO TO SFI SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) |
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Automatic Transaxle System: Intermediate Shaft Speed Sensor "A" Circuit Short to Battery (P079112,P079114,P079131)
DESCRIPTION The transmission revolution sensor (NC) detects the rotation speed of the counter gear which shows the output shaft speed of automatic transaxle assembly. Based on the transmission revolution sensor (NC) signal and the transmission revolution sensor (NT and NC3) signals, the ECM controls ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Seat Heater System: Seat Heater for Front Right Seat does not Operate
DESCRIPTION When the refreshing seat switch (for front side) is operated, the air conditioning amplifier assembly receives the signal. The air conditioning amplifier assembly receives the signal and operates the front seat heater. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
If the battery vol ...