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Home >> Toyota >> 2008 >> Sequoia 4WD V8-5.7L (3UR-FE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> 4WD Control ECU Communication Stop Mode
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4WD Control ECU Communication Stop Mode








NETWORKING: CAN COMMUNICATION SYSTEM: 4WD Control ECU Communication Stop Mode

4WD Control ECU Communication Stop Mode

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NEXT -- Continue to next step.
2. CHECK FOR OPEN IN CAN BUS WIRE (4WD CONTROL ECU BRANCH WIRE)





(a) Disconnect the A28 4WD control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE 4WD CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BATTERY AND BODY GROUND)
(a) Reconnect the cable to the negative (-) battery terminal.





(b) Disconnect the A29 4WD control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE 4WD CONTROL ECU
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