Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012687,U012987)
DESCRIPTION
When a malfunction is detected between various ECUs and sensors, these DTCs are stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U010087 | Lost Communication with ECM/PCM "A" Missing Message | While the vehicle is being driven at 5 km/h (4 mph) or more, a communication error between the ECM and the forward recognition camera is detected for approximately 6 seconds or more. | CAN communication system |
| U012587 | Lost Communication with Multi-axis Acceleration Sensor Module Missing Message |
| CAN communication system |
| U012687 | Lost Communication with Steering Angle Sensor Module Missing Message | 3 seconds or more after the engine switch is turned on (IG), a communication error between the steering sensor and the forward recognition camera is detected for approximately 1 second or more. | CAN communication system |
| U012987 | Lost Communication with Brake System Control Module Missing Message | 3 seconds or more after the engine switch is turned on (IG), a communication error between the skid control ECU (brake actuator assembly) and the forward recognition camera is detected for approximately 1 second or more. | CAN communication system |
PROCEDURE
| 1. | CHECK FOR DTCs |
(a) Clear the DTCs.
Body Electrical > Pre-Collision System > Clear DTCs(b) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Body Electrical > Pre-Collision System > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U010087, U012587, U012687 and U012987 are not output | A |
| DTC U010087, U012587, U012687 or U012987 is output | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | GO TO CAN COMMUNICATION SYSTEM |
Stop Light Relay Actuator Stuck (C142571)
DESCRIPTION The skid control ECU (brake actuator assembly) sends a stop light operation request signal to the stop light relay (semiconductor PWR integration ECU). If the skid control ECU (brake actua ...
Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)
DESCRIPTION The forward recognition camera and millimeter wave radar sensor assembly communicate via CAN communication. If a signal is not received from the millimeter wave radar sensor assembly, the ...
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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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