CAN Communication System - Diagnostics: Other Lexus GX J120

TERMINALS OF ECU

HINT

This part of the article describes the standard CAN values for all CAN related components.

Scheme 270

Scheme 271

Scheme 272

Scheme 273

Scheme 274

Scheme 275

Scheme 276

Scheme 277

Scheme 278

Scheme 279

Scheme 280

Scheme 281

Scheme 282

Scheme 283

Scheme 284

1. CAN J/C CAN J/C connectors. HINT: The connectors connected to the CAN J/C can be distinguished by the colors of the bus lines and the connecting side of the connector. J39, J40, J41 and J42 are interchangeable. COLOR SPECIFICATION CAN J/C connectors ("A" side, w/ earth terminal) Color (CAN-H Side) Color (CAN-L Side) ECM (J39) L LG DLC3 (J40) P V Skid Control ECU (J41) B W Steering angle sensor (J42) Y B COLOR SPECIFICATION CAN J/C connectors ("B" side, w/o earth terminal) Color (CAN-H Side) Color (CAN-L Side) Yaw rate sensor (J43) R W The terminals of the CAN J/C connectors. TERMINAL SPECIFICATION Terminal Terminal symbol 1 CANH 2 CANL Measure the resistance according to the value(s) in «TERMINALS SPECIFIED VALUE»(ref-228775-S06796233342006041100000). Standard: TERMINALS SPECIFIED VALUE Terminals Specified value CANH - CANL 108 to 132 ohms
2. DLC3 Check the DLC3. Measure the resistance according to the value(s) in (Scheme 274). Standard
3. SKID CONTROL ECU Check the skid control ECU harness side connector (S37). Disconnect the connector (S37) from the skid control ECU. Measure the resistance according to the value(s) in (Scheme 276). Standard
4. STEERING ANGLE SENSOR Check the harness side connector (S12) of the steering angle sensor. Disconnect the connector (S12) from the steering angle sensor. Measure the resistance according to the value(s) in (Scheme 278). Standard
5. YAW RATE SENSOR Check the yaw rate sensor harness side connector (Y1). Disconnect the connector (Y1) from the yaw rate sensor. Measure the resistance according to the value(s) in (Scheme 280). Standard
6. ECM Measure the resistance according to the value(s) in (Scheme 282). Measure the resistance according to the value(s) in (Scheme 284). Standard

Scheme 285

Scheme 286

Scheme 287

1. BUS CHECK HINT: The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the hand-held tester via the CAN VIM. Select "BUS CHECK" from the "OBD/MOBD MENU" screen. Press "ENTER" on the hand-held tester via the CAN VIM. The screen displays the ECUs and sensors that are properly connected to the CAN communication system. HINT: There is a communication stop in the system of any properly connected ECUs or sensors that are not displayed (See «PROBLEM SYMPTOMS TABLE»(ref-228775-S31395648942006041100000) ).

FAIL-SAFE TABLE

1. FAIL-SAFE FUNCTION When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or any other cause, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning. This function operates for each system when communication is impossible. (For further details, see the references for each system.) FAIL-SAFE TABLE Function ECM Skid Control ECU Steering Angle Sensor Yaw Rate Sensor Action when unable to communicate DTC detection (Driver detectable) VSC Control (Controls VSC/TRAC engine output) - Rx Tx Tx VSC function stops Detectable (Lamp comes on) VSC Control (Controls VSC/TRAC engine output) Rx or Tx Tx or Rx - - VSC function stops Detectable (Lamp comes on) HINT: Rx: Reception from each ECU (sensor). Tx: Transmission to each ECU (sensor).