Lexus ES: Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012987,U014087,U015587)
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 | 2 seconds or more after the engine switch is turned on (IG), while the vehicle is being driven at 1 km/h or 1 mph or more and the road sign assist system is on, a communication error between the ECM and the forward recognition camera is detected for approximately 5 seconds or more. | CAN communication system |
| U012587 | Lost Communication with Multi-axis Acceleration Sensor Module Missing Message | While the vehicle is being driven at 1 km/h or 1 mph or more and the road sign assist system is on, a communication error between the yaw rate sensor (airbag ECU assembly) and the forward recognition camera is detected for approximately 5 seconds or more. | CAN communication system |
| U012987 | Lost Communication with Brake System Control Module Missing Message | 2 seconds or more after the engine switch is turned on (IG), while the vehicle is being driven at 1 km/h or 1 mph or more and the road sign assist system is on, a communication error between the skid control ECU (brake actuator assembly) and the forward recognition camera is detected for approximately 5 seconds or more. | CAN communication system |
| U014087 | Lost Communication with Body Control Module Missing Message | 2 seconds or more after the engine switch is turned on (IG), while the road sign assist system is on, a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more. | CAN communication system |
| U015587 | Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message | 2 seconds or more after the engine switch is turned on (IG), while the road sign assist system is on, a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more. | CAN communication system |
PROCEDURE
| 1. | CHECK FOR DTCs |
(a) Clear the DTCs.
Body Electrical > Road Sign Assist > 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 > Road Sign Assist > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U010087, U012587, U012987, U014087 and U015587 are not output | A |
| DTC U010087, U012587, U012987, U014087 or U015587 is output | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | GO TO CAN COMMUNICATION SYSTEM |
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Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following s
Parts Location
PARTS LOCATION ILLUSTRATION *1 FORWARD RECOGNITION CAMERA *2 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *3 BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SKID CONTROL ECU - - ILLUSTRA
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