CAN Communication System (Diagnostic Codes & Symptom Tests): Overview Lexus HS I

DESCRIPTION

HINT

The diagnosis procedure is for when DTC U0125 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 128

HINT

The diagnosis procedure is for when DTC U0126 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 129

HINT

The diagnosis procedure is for when DTC U0127 is output by the main body ECU (Techstream display: Main Body).

Scheme 130

HINT

The diagnosis procedure is for when DTC U0129 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 131

HINT

The diagnosis procedure is for when DTC U0131 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 132

HINT

The diagnosis procedure is for when DTC U0199 is output by the main body ECU (Techstream display: Main Body).

Scheme 133

HINT

The diagnosis procedure is for when DTC U0200 is output by the main body ECU (Techstream display: Main Body).

Scheme 134

HINT

The diagnosis procedure is for when DTC U0208 is output by the main body ECU (Techstream display: Main Body).

Scheme 135

The millimeter wave radar sensor and driving support ECU transmit the data for general vehicle control and diagnosis function along the communication line. The millimeter wave radar sensor assembly transmits information about the vehicle in front to the driving support ECU.

HINT

The diagnosis procedure is for when DTC U0235 is output by the driving support ECU (Techstream display: Pre-collision2.

Scheme 136

HINT

The diagnosis procedure is for when DTC U0100 or U0293 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 137

1. The power management control ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the CAN No. 2 bus.
2. When the power management control ECU receives a response signal from the ECUs connected to the CAN No. 2 bus, the power management control ECU recognizes and memorizes that the ECU is connected to the CAN No. 2 bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the CAN No. 2 bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN No. 2 bus, the power management control ECU determines that a malfunction exists.

HINT

The diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 138

Scheme 139

1. The power management control ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the power management bus.
2. When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management control ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to the power management bus, the power management control ECU determines that a malfunction exists.

HINT

The diagnosis procedure is for when DTC U0164 and U1002 are output by the power management control ECU (Techstream display: Power Management2).

Scheme 140

1. The main body ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the CAN MS bus.
2. When the main body ECU receives a response signal from the ECUs connected to the CAN MS bus, the main body ECU recognizes and memorizes that the ECU is connected to the CAN MS bus. Based on this memorized data, the main body ECU monitors for malfunctions in the ECUs connected to the CAN MS bus when communicating with those ECUs. If the main body ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN MS bus, the main body ECU determines that a malfunction exists.

HINT

The diagnosis procedure is for when DTC U1002 is output by the main body ECU (Techstream display: Main Body).

Scheme 141

The driving support ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the driving support bus.

HINT

The diagnosis procedure is for when DTC U1002 is output by the driving support ECU (Techstream display: Pre-Collision2).

Scheme 142

HINT

The diagnosis procedure is for when DTC U110B is output by the power management control ECU (Techstream display: Power Management1).

Scheme 143

HINT

The diagnosis procedure is for when DTC U1110 is output by the power management control ECU (Techstream display: Power Management1).

Scheme 144

HINT

The diagnosis procedure is for when DTC U1115 is output by the main body ECU (Techstream display: Main Body).

Scheme 145

HINT

The diagnosis procedure is for when DTC U1121 is output by the driver support ECU (Techstream display: Pre-collision2).

Scheme 146

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Scheme 149

The transmission control ECU drives the parking lock actuator in accordance with signals from the power management control ECU.

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Scheme 158

There may be an open circuit in the CAN No. 1 bus main wire and/or the DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 ohms or higher.

Scheme 159

There may be a short circuit in the CAN No. 1 bus main wire and/or CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 ohms.

Scheme 160

Scheme 161

There may be a short circuit between the CAN bus main wire and +B when no resistance exists between terminals 6 (CANH) and 16 (BAT) or 14 (CANL) and 16 (BAT) of the DLC3.

There may be a short circuit between the CAN bus main wire and GND when there is no resistance between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of the DLC3.

If some ECUs and sensors are not displayed on the "CAN Bus Check" screen of the Techstream and some ECUs and sensors repeatedly appear and disappear from the screen when the CAN main bus wires are normal (there is no open, short, short to B+ or short to GND in the main bus wires), there may be an open circuit in either of the CAN branch wires.

HINT

If some ECUs and sensors repeatedly appear and disappear from the "CAN Bus Check" screen, communication between the normal ECUs (sensors) and the Techstream may be affected by the incomplete signals that are output from the ECU that has an open circuit in either of its CAN branch wires. In this case, the CAN branch wires for the ECUs and sensors that repeatedly appear and disappear from the screen are normal and the ECU that is not displayed on the screen may be the main cause of the problem (this ECU may have an open circuit in either of its CAN branch wires).

See also:
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL