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CAN Communication: Other Lexus SC II рестайлинг

Communication Devices 8 illustrations ~1058 words

TERMINALS OF ECU

HINT

This section describes the standard CAN values for all CAN related components.

Scheme 68

Scheme 68: TERMINALS OF ECU
Scheme 68: TERMINALS OF ECU

Scheme 69

Scheme 69
Scheme 69

Scheme 70

Scheme 70
Scheme 70

Scheme 71

Scheme 71
Scheme 71

Scheme 72

Scheme 72
Scheme 72
  1. JUNCTION CONNECTOR (Scheme 68): Identifying Junction Connector Terminals JUNCTION CONNECTOR REFERENCE Junction Connector Wiring Color Connect to CANH (J25-10) R ECM CANL (J25-21) W ECM CANH (J25-11) R Translate ECU CANL (J25-22) W Translate ECU CANH (J25-9) R DLC3 CANL (J25-20) W DLC3 CA1H (J25-8) R Gateway ECU CA1L (J25-19) W Gateway ECU
  2. CHECK DLC3 Measure the resistance of the connector. (Scheme 69): Identifying DLC3 Connector Terminal DLC3 CONNECTOR REFERENCE Symbols (Terminal No.) Wiring Color Condition Specified Condition CANH (D1-6) - CANL (D1-14) R - W Ignition switch OFF 54 to 69 ohms CANH (D1-6) - CG (D1-4) R - W-B Ignition switch OFF 1 kohms or higher CANL (D1-14) - CG (D1-4) W - W-B Ignition switch OFF 1 kohms or higher CANH (D1-6) - BAT (D1-16) R - B Ignition switch OFF 1 Mohms or higher CANL (D1-14)- BAT (D1-16) W - B Ignition switch OFF 1 Mohms or higher
  3. CHECK ECM (Scheme 70): Identifying ECM Connector Terminals Measure the resistance of the connector. ECM CONNECTOR REFERENCE Symbols (Terminal No.) Wiring Color Condition Specified Condition CANH (E6-25) - CANL (E6-24) R - W Ignition switch OFF 54 to 69 ohms Disconnect the E4 and E6 ECM connectors. Measure the resistance of the wire harness side connectors. CONNECTOR TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Condition Specified Condition CANH (E6-25) - CANL (E6-24) R - W Ignition switch OFF 108 to 132 ohms CANH (E6-25) - E01 (E4-2) R - W-B Ignition switch OFF 1 kohms or higher CANL (E6-24) - E01 (E4-2) W - W-B Ignition switch OFF 1 kohms or higher CANH (E6-25) - BATT (E6-4) R - B Ignition switch OFF 1 Mohms or higher CANL (E6-24) - BATT (E6-4) W - B Ignition switch OFF 1 Mohms or higher
  4. CHECK TRANSLATE ECU (Scheme 71): Identifying Translate ECU Connector Terminals Disconnect the T28 ECU connector. Measure the resistance of the wire harness side connectors. CONNECTOR TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Condition Specified Condition CANH (T28-8) - CANL (T28-10) R - W Ignition switch OFF 108 to 132 ohms CANH (T28-8) - GND (T28-40) R - W-B Ignition switch OFF 1 kohms or higher CANL (T28-10) - GND (T28-40) W - W-B Ignition switch OFF 1 kohms or higher CANH (T28-8) - BAT (D1-16) R - B Ignition switch OFF 1 Mohms or higher CANL (T28-10) - BAT (D1-16) W - B Ignition switch OFF 1 Mohms or higher
  5. CHECK GATEWAY ECU (Scheme 72): Identifying Gateway ECU Connector Terminals Measure the resistance of the connector. CONNECTOR TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Condition Specified Condition CA1H (G3-17) - CA1L (G3-18) R - W Ignition switch OFF 54 to 69 ohms Disconnect the G3 ECU connector. Measure the resistance of the wire harness side connector. CONNECTOR TERMINALS REFERENCE Symbols (Terminal No.) Wiring Color Condition Specified Condition CA1H (G3-17) - CA1L (G3-18) R - W Ignition switch OFF 54 to 69 ohms CA1H (G3-17) - GND (G3-24) R - W-B Ignition switch OFF 1 kohms or higher CA1L (G3-18) - GND (G3-24) W - W-B Ignition switch OFF 1 kohms or higher CA1H (G3-17) - BATT (G3-10) R - B Ignition switch OFF 1 Mohms or higher CA1L (G3-18) - BATT (G3-10) W - B Ignition switch OFF 1 Mohms or higher

Scheme 73

Scheme 73: DIAGNOSIS SYSTEM
Scheme 73: DIAGNOSIS SYSTEM

Scheme 74

Scheme 74
Scheme 74

Scheme 75

Scheme 75
Scheme 75
  1. BUS CHECK Select "BUS CHECK" from the "OBD/MOBD MENU" screen. HINT: The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the intelligent tester via the CAN VIM. (Scheme 73): Selecting BUS CHECK On OBD/MOBD MENU Screen Press "ENTER" on the intelligent tester via the CAN VIM. (Scheme 74): OBD/MOBD MENU Screen Display - ENTER The screen displays the ECUs that are properly connected to the CAN communication system. HINT: There is a communication stop in the system of any properly connected ECUs that are not displayed.
  2. DTC TABLE BY ECU HINT: In the CAN communication system, CAN communication system DTCs can be displayed by the ECU using the intelligent tester (with CAN VIM). If CAN communication system DTCs are output, the trouble cannot be determined only by the DTCs. Perform troubleshooting according to " «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-283179-S28993708122008041900000) ". (Scheme 75): OBD/MOBD MENU Screen Display - ECUs Connected ECM HINT: The ECM is connected to the CAN communication system. DTC CHART DTC No. Detection Item U0001 High Speed CAN Communication Bus HINT: The ECM is malfunctioning if U0001 is output alone. Replace the ECM. Skid control ECU HINT: DTC communication uses the SIL line. DTC CHART DTC No. Detection Item U0073/42 Control Module Communication Bus OFF U0100/65 Lost Communication with ECM / PCM GATEWAY ECU HINT: The gateway ECU is connected to the CAN communication system but CAN communication DTCs are not output.
  3. DTC COMBINATION TABLE DTC COMBINATION CHART DTC Trouble Mode Output from Output DTC ECM COMMUNICATION STOP MODE GATEWAY ECU COMMUNICATION STOP MODE TRANSLATE ECU COMMUNICATION STOP MODE Skid control ECU assembly U0073/42 X X o U0100/65 x: During driving X x: During driving HINT: o: Output x: Outputs under the following condition X: Not output Perform troubleshooting according to the combination of DTCs output. HINT: (see «ECM COMMUNICATION STOP MODE»(ref-283179-S32808971872008041900000) ) (see «GATEWAY ECU COMMUNICATION STOP MODE»(ref-283179-S05633630422008041900000) ) (see «TRANSLATE ECU COMMUNICATION STOP MODE»(ref-283179-S28452604312008041900000) )

FAIL-SAFE CHART

  1. FAIL-SAFE FUNCTION When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning. The fail-safe function activates on each system when communication is not possible. (For further details, see the pages for each system.) FAIL-SAFE CHART Function ECM Gateway ECU Translate ECU Condition when communication is impossible DTC detection (Driver detectable) VSC Control (Controls driving force while VSC is in operation) o - • VSC function stops Detectable (Light comes on) VSC Control (Control VSC / TRC engine output) o - • VSC function stops Detectable (Light comes on) Meter Display (Displays operation condition and DTCs) o • o Light does not come on or remains on Can be recognized with abnormal lighting of the light HINT: •: Control master o: System related

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