STOP AND START SYSTEM, Diagnostic DTC:U0100, U0121, U0126, U0131, U0140, U0151, U0155, U0164
| DTC Code | DTC Name |
|---|---|
| U0100 | Lost Communication with ECM / PCM "A" |
| U0121 | Lost Communication with Anti-lock Brake System (ABS) Control Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
| U0131 | Lost Communication with Electric Power Steering ECU |
| U0140 | Lost Communication with J/B ECU |
| U0151 | Lost Communication with SRS Airbag ECU |
| U0155 | Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) |
| U0164 | Lost Communication with HVAC Control Module |
DESCRIPTION
The engine stop and start ECU communicates with the SFI system, VSC system, power steering system, meter/gauge system, air conditioning system, airbag system and main body ECU (multiplex network body ECU) via CAN communication.
If an error occurs in communication between the engine stop and start ECU and any of the systems, the engine stop and start ECU stores DTCs and illuminates the stop and start cancel indicator light except when there is a communication error with the meter/gauge system.
Tech Tips
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When there is an open in the output side of the backup boost converter (built-into the engine stop and start ECU), power to the system with an open circuit is cut off. The engine stop and start ECU stores CAN communication DTCs for the system with an open circuit and stop and start system DTC P323B.
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When the backup boost converter (built-into the engine stop and start ECU) detects overcurrent in any of the circuits it supplies power to, it shuts off the circuit. The engine stop and start ECU stores CAN communication DTCs for the system which circuit was shutoff and stores stop and start system DTC B22C0.
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e.g.: When the backup boost converter (built into the engine stop and start ECU) detects overcurrent in the power source circuit of the power steering system and cuts off power supply, the engine stop and start ECU stores DTC U0131 and DTC B22C0.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0100 | No communication between the engine stop and start ECU and the ECM for 0.8 seconds. |
|
| U0121 | No communication between the engine stop and start ECU and the skid control ECU for 2.3 seconds. |
|
| U0126 | No communication between the engine stop and start ECU and the steering angle sensor for 0.72 seconds. |
|
| U0131 | No communication between the engine stop and start ECU and the power steering ECU for 0.8 seconds. |
|
| U0140 | No communication between the engine stop and start ECU and the main body ECU for 3.6 seconds. |
|
| U0151 | No communication between the engine stop and start ECU and the airbag sensor assembly for 10.6 seconds. |
|
| U0155 | No communication between the engine stop and start ECU and the combination meter for 10.6 seconds. |
|
| U0164 | No communication between the engine stop and start ECU and the A/C amplifier for 10.6 seconds. |
|
CAUTION / NOTICE / HINT
Proceed to CAN Communication System Click here.
Tech Tips
When any DTCs indicating a CAN communication system malfunction are output, troubleshoot the CAN communication system before repairing each corresponding component.
