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 |
READ NEXT:
Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012687,U012987,U015587,U110687)
DESCRIPTION The forward recognition camera communicates with each sensor and ECU via CAN communication. If any malfunction is detected in a CAN communication circuit, one or more CAN communication sys
Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message (U023587)
DESCRIPTION The forward recognition camera communicates with the millimeter wave radar sensor assembly via CAN communication. If a communication malfunction between the forward recognition camera and
Internal Control Module Software Incompatibility Not Programmed (U030051)
DESCRIPTION If the forward recognition camera cannot verify the vehicle information sent from the ECM, the forward recognition camera stores DTC U030051. DTC No. Detection Item DTC Detection Co
SEE MORE:
System Diagram
SYSTEM DIAGRAM HINT: See the layout drawing to confirm the locations and tightening torque of flexible hoses and brake lines. *A for HV Model - - *1 Brake Booster with Master Cylinder Assembly *2 Brake Actuator Assembly *3 Brake Booster Pump Assembly - - *a Brake
Removal
REMOVAL CAUTION / NOTICE / HINT NOTICE: This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts. Click here PROCEDURE 1. REMOVE CAM TIMING OIL CONTROL SOLENOID ASSEMBLY Click here 2. REMOVE CAMSHAFT TIMING OIL CONTR
