Lexus ES: Lost Communication with ECM/PCM "A" Missing Message (U010087,U010487,U012287)
DESCRIPTION
The ECM communicates with each sensor and ECU via CAN communication.
If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from |
|---|---|---|---|---|---|
| U010087 | Lost Communication with ECM/PCM "A" Missing Message | When the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake actuator assembly) and ECM is detected for approximately 1 second or more. |
| Does not come on | ECM |
| U010487 | Lost Communication with Cruise Control Module Missing Message | When the engine switch is on (IG) and the dynamic radar cruise control system is operating, a communication malfunction between the millimeter wave radar sensor assembly and ECM is detected for approximately 1 second or more. |
| Does not come on | ECM |
| U012287 | Lost Communication with Vehicle Dynamics Control Module Missing Message | When the engine switch is on (IG) and the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake actuator assembly) and ECM is detected for approximately 2.6 seconds or more. |
| Does not come on | ECM |
PROCEDURE
| 1. | CHECK FOR DTCs |
(a) Clear the DTCs.
Powertrain > Radar Cruise1 > 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.
Powertrain > Radar Cruise1 > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U010087, U010487 and U012287 are not output | A |
| DTC U010087, U010487 or U012287 is output | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | GO TO CAN COMMUNICATION SYSTEM |
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