System
A -- CHECK FOR INTERMITTENT PROBLEMS See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Diagrams/Diagnostic Aids/How To Troubleshoot ECU Controlled Systems/How To Proceed With Troubleshooting
4. REPAIR OR REPLACE HARNESS OR CONNECTOR
(a) Turn the engine switch off.
(b) Repair or replace the harness or connector.
(c) Check for any momentary interruption between the skid control ECU and each sensor or ECM See: Brakes and Traction
Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Check for
Intermittent Problems.
(d) Check that there are no momentary interruptions.
NEXT -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the engine switch off.
(b) Clear the DTCs See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.
(e) Check that no CAN communication system DTC is output See: Powertrain Management/Computers and Control
Systems/Information Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/Diagnosis
System.
(f) If ABS and/or VSC system DTCs are output, record them.
Result:
HINT
The CAN communication system must be normal when performing troubleshooting for each sensor DTC (for ABS and/or VSC
system).
C -- INSPECT CAN COMMUNICATION SYSTEM See: Powertrain Management/Computers and Control Systems/Information
Bus/Testing and Inspection/Initial Inspection and Diagnostic Overview/CAN Communication System/How to Proceed With
Troubleshooting
B -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC See: Diagnostic Trouble Code Descriptions/Vehicle Stability Control
System
A -- END
Up to 08/2009
CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U0100,U0122,U0123,U0126,U1104: Lost Communication with
ECM / PCM "A"
U1104 - Lost Communication with Driving Support ECU
DESCRIPTION
The ECM communicates several signals with each sensor and ECU by CAN communication circuit.
There are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.
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