Diagnosis Procedure

1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
   • TCU
   • 3CH CAN gateway

Is the inspection result normal?

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GO TO 2.

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Repair the terminal and connector.

1. Disconnect the connector of 3CH CAN gateway.
2. Check the continuity between the 3CH CAN gateway harness connector terminals.

   3CH CAN gateway harness connector			Continuity
   Connector No.	Terminal No.
   M454	9	13	Existed
   	10	14	Existed

Is the inspection result normal?

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GO TO 3.

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Check the harness and repair the root cause (IT CAN communication circuit side).

1. Connect the connector of 3CH CAN gateway.
2. Disconnect the connector of TCU.
3. Check the resistance between the TCU harness connector terminals.

   TCU harness connector			Resistance (Ω)
   Connector No.	Terminal No.
   M126	6	7	Approx. 54 - 66

Is the measurement value within the specification?

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GO TO 4.

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Repair the TCU branch line.

Check the power supply and the ground circuit of the TCU. Refer to Diagnosis Procedure .

Is the inspection result normal?

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Replace the TCU. Refer to Removal and Installation .

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Error was detected in the TCU branch line.

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Repair the power supply and the ground circuit.