DESCRIPTION
The driving support ECU assembly sends vehicle speed and vehicle condition information to the millimeter wave radar sensor assembly. The millimeter wave radar sensor assembly then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU assembly. The driving support ECU assembly sends this information to the ECM and performs pre-collision system operation.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U0235 | Lost Communication with Cruise Control Front Distance Range Sensor | When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second. | CAN communication system Millimeter wave radar sensor assembly Driving support ECU assembly |
| U1104 | Lost Communication with Driving Support ECU | When the engine switch is on (IG), a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 1 second. | CAN communication system Millimeter wave radar sensor assembly Driving support ECU assembly |
Scheme 18
The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on this information, the driving support ECU assembly sends pre-collision control operation signals. These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect crashes, or between ECUs that perform the pre-collision control.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| U0100 | Lost Communication with ECM / PCM "A" | When the engine switch is on (IG), a communication error between the ECM and the driving support ECU assembly is detected for approximately 5 seconds. | CAN communication system ECM Driving support ECU assembly |
| U0125 | Lost Communication with Yaw Rate Sensor Module | When the engine switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU assembly is detected for approximately 1 second. | CAN communication system Yaw rate sensor Driving support ECU assembly |
| U0126 | Lost Communication with Steering Angle Sensor Module | When the engine switch is on (IG), a communication error between the spiral with sensor cable sub-assembly (steering angle sensor) and the driving support ECU assembly is detected for approximately 4 seconds. | CAN communication system Spiral with sensor cable sub-assembly Driving support ECU assembly |
| U0129 | Lost Communication with Brake System Control Module | When the engine switch is on (IG), a communication error between the brake actuator assembly (skid control ECU) and the driving support ECU assembly is detected for approximately 3 seconds. | CAN communication system Brake actuator assembly (skid control ECU) Driving support ECU assembly |
| U0142 | Lost Communication with Body Control Module "B" | When the engine switch is on (IG), a communication error between the main body ECU (multiplex network body ECU) and driving support ECU assembly is detected for approximately 14.2 seconds. | CAN communication system Main body ECU (multiplex network body ECU) Driving support ECU assembly |
| U1002 | Lost Communication with Gateway Module | When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and driving support ECU assembly is detected for approximately 0.5 seconds. | CAN communication system Millimeter wave radar sensor assembly Driving support ECU assembly |
When the driving support ECU assembly receives a vehicle stability control system malfunction signal from the brake actuator assembly (skid control ECU) via CAN communication, DTC C1A50 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A50 | Brake System | When the dynamic radar cruise control system is operating, the input malfunction signal from the brake actuator assembly (skid control ECU) continues for 0.2 seconds or more. | Vehicle stability control system Driving support ECU assembly |
The brake actuator assembly (skid control ECU) sends a stop light operation signal to the semiconductor PWR integration ECU. When the brake actuator assembly (skid control ECU) detects a malfunction in the stop light circuit, the driving support ECU assembly stores DTC C1A4B.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A4B | Stop Light Relay Circuit | Either of the following conditions is met: When the engine switch is on (IG), the IG1 terminal voltage is between 11 and 14 V and the stop light illumination output signal (STOP) is output, the signal is not received at terminal STP2 for 0.3 seconds or more. When the engine switch is on (IG), the IG1 terminal voltage is between 11 and 14 V and the stop light illumination output signal (STOP) is not output, the signals received at terminals STP and STP2 are different for 0.3 seconds or more. | Lighting system Vehicle stability control system Harness or connector Semiconductor PWR integration ECU Driving support ECU assembly |
Scheme 19
Based on pre-collision control, the driving support ECU assembly provides warnings to the driver. The driving support ECU assembly does this by sending a request signal to the millimeter wave radar sensor assembly to sound the skid control buzzer assembly.
When the millimeter wave radar sensor assembly detects a malfunction in the skid control buzzer assembly circuit, a malfunction signal is sent to the driving support ECU assembly, and this DTC is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A4A | Skid Control Buzzer Circuit | While the engine switch is on (IG), a skid control buzzer assembly circuit malfunction signal is received from the millimeter wave radar sensor assembly for 3 seconds or more. | Harness or connector Skid control buzzer assembly Millimeter wave radar sensor assembly Driving support ECU assembly |
Scheme 20
The brake actuator assembly (skid control ECU) receives steering rotation angle information from the spiral with sensor cable sub-assembly (steering angle sensor), and sends the information to the driving support ECU assembly via CAN communication.
If the brake actuator assembly (skid control ECU) detects a malfunction of the spiral with sensor cable sub-assembly (steering angle sensor), it sends a malfunction signal to the driving support ECU assembly and stores this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A47 | Steering Angle Sensor | While the vehicle speed is 50 km/h (31 mph) or more, a spiral with sensor cable sub-assembly (steering angle sensor) malfunction signal is received from the brake actuator assembly (skid control ECU) for 2 seconds or more. | Vehicle stability control system Brake actuator assembly (skid control ECU) Driving support ECU assembly |
The brake actuator assembly (skid control ECU) receives vehicle stability control system signals from the yaw rate sensor and sends the signals to the driving support ECU assembly and network gateway ECU. If the brake actuator assembly (skid control ECU) detects that the yaw rate sensor is malfunctioning, the brake actuator assembly (skid control ECU) sends a malfunction signal to the driving support ECU assembly, and the driving support ECU assembly stores this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A46 | Yaw Rate Sensor | While the vehicle speed is 5 km/h (3 mph) or more, a yaw rate sensor malfunction signal is received from the brake actuator assembly (skid control ECU) for 1 second or more. | Vehicle stability control system Brake actuator assembly (skid control ECU) Driving support ECU assembly |
The brake actuator assembly (skid control ECU) receives brake control request signals from the ECM and driving support ECU assembly.
When the request signals received from the ECM and driving support ECU assembly are not consistent, the brake actuator assembly (skid control ECU) determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU assembly.
If the driving support ECU assembly receives a malfunction signal, DTC C1A41 is output. Although the brake actuator assembly (skid control ECU) sends a malfunction signal to the driving support ECU assembly, the vehicle stability control system does not output a relevant malfunction detection DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A41 | Brake Request Value Mismatch between ENG / EHV and Driving Support ECU | While the engine switch is on (IG), the brake actuator assembly (skid control ECU) detects a significant difference in the brake request signal from the ECM and driving support ECU assembly for 3 seconds or more. | Vehicle stability control system SFI system ECM Brake actuator assembly (skid control ECU) Driving support ECU assembly |
When the driving support ECU assembly receives a SFI system or Automatic transmission system malfunction signal from the ECM, this DTC is stored.
When DTC C1A40 is stored, the SFI system or automatic transmission system DTC will also be stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A40 | ENG / EHV Device | While the engine switch is on (IG), a SFI system malfunction signal is detected for 3 seconds or more. | SFI system Automatic transmission system ECM Driving support ECU assembly |
The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.
Based on this information, the driving support ECU assembly sends pre-collision control operation signals.
When the vehicle is determined to be driving in a straight line or on a gradual curve based on signals from the yaw rate sensor etc., the millimeter wave radar sensor assembly performs self-diagnosis to check if the sensor beam axis has deviated from the vehicle movement direction. When the millimeter wave radar sensor assembly beam axis has deviated, the driving support ECU assembly detects this, and stores DTC C1A11.
After installing a new millimeter wave radar sensor assembly, if sensor beam axis adjustment is not performed, DTC C1A14 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A11 | Front Radar Sensor Incorrect Axial Gap | When the engine switch is on (IG), misalignment of the millimeter wave radar sensor assembly is detected for approximately 2 seconds. | Millimeter wave radar sensor assembly Driving support ECU assembly |
| C1A14 | Front Radar Sensor Beam Axis Not Adjusted | When the vehicle is being driven at a speed of 5 km/h (3 mph) or more, misalignment of the millimeter wave radar sensor assembly is detected for approximately 1 second. | Millimeter wave radar sensor assembly Driving support ECU assembly |
The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.
Based on this information, the driving support ECU assembly sends pre-collision control operation signals.
When the driving support ECU assembly receives information that there is a malfunction in the millimeter wave radar sensor assembly, DTC C1A10 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A10 | Front Radar Sensor | When the engine switch is on (IG), the driving support ECU assembly receives information that there is a malfunction in the millimeter wave radar sensor assembly for approximately 2 seconds. | Millimeter wave radar sensor assembly Driving support ECU assembly |
The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.
Based on this information, the driving support ECU assembly sends pre-collision control operation signals.
When the millimeter wave radar sensor assembly is replaced with a new one, it acquires the country specification information from the driving support ECU assembly. Also, when the driving support ECU assembly is replaced with a new one, it receives country specification information from the main body ECU (multiplex network body ECU). When country specification information in the millimeter wave radar sensor assembly, driving support ECU assembly and/or main body ECU (multiplex network body ECU) do not match, DTC C1A0A is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A0A | Front Radar Sensor Region Code Mismatch | When the engine switch is on (IG), the country specification information from the driving support ECU assembly and millimeter wave radar sensor assembly do not match for approximately 2 seconds. | Millimeter wave radar sensor assembly Driving support ECU assembly Main body ECU (multiplex network body ECU) |
The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle.
Based on this information, the driving support ECU assembly calculates the risk of a crash and operates the pre-collision system when it determines that the risk is high.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A01 | Driving Support ECU | When the engine switch is on (IG), the driving support ECU assembly detects an internal malfunction for approximately 1 second. | Driving support ECU assembly |
When a new driving support ECU assembly is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or AWD information, etc.) from the main body ECU (multiplex network body ECU) and memorizes the information.
DTC C1A02 is stored when the driving support ECU assembly receives the vehicle specification information from the main body ECU (multiplex network body ECU) but cannot record it.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A02 | Vehicle Information Not Obtained | Inconsistent vehicle specification information between the main body ECU (multiplex network body ECU) and driving support ECU assembly continues for 1 second or more while the vehicle is being driven at a speed of 10 km/h (6 mph) or more. | Main body ECU (multiplex network body ECU) Driving support ECU assembly |
The driving support ECU assembly receives a pre-collision system on/off signal from the pre-collision system cancel switch assembly.
Scheme 21
See also:
• REMOVAL [04/2013 - ]