Tundra 4WD V8-4.6L (1UR-FE) (2010)
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 prevent airbag and seat belt
pretensioner activation.
NEXT -- Continue to next step.
2. CHECK FOR OPEN IN CAN BUS WIRE (POWER STEERING ECU BRANCH WIRE)
(a) Disconnect the J101 power steering ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE POWER STEERING ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BATTERY AND BODY GROUND)
(a) Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
(b) Disconnect the J101 power steering 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: