Diagnosis Item 15: Diagnose the lines between the joint connectors (CAN3 and CAN1).


caution When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.

FUNCTION



TROUBLE JUDGEMENT CONDITIONS



PROBABLE CAUSE



DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-126 intermediate connector, joint connector (CAN3) and joint connector (CAN1)
caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector. Replace the joint connector as necessary.

STEP 2. Resistance measurement at joint connector (CAN3) and C-126 intermediate connector.
caution A digital multimeter should be used. For details refer to .
caution The test wiring harness should be used. For details refer to .
(1)Disconnect the joint connector (CAN3) and the intermediate connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.
(4)Continuity between joint connector (CAN3) terminal No.10 and C-126 intermediate connector terminal No.15
OK: Continuity (2 Ω or less)
(5)Continuity between joint connector (CAN3) terminal No.21 and C-126 intermediate connector terminal No.16
OK: Continuity (2 Ω or less)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?
<All the resistances measure 2 Ω or less> Go to Step 3 .
NO : <Either or all of the resistances measure more than 2 Ω> Repair the wiring harness between joint connector (CAN3) and intermediate connector C-126.

STEP 3. Resistance measurement at joint connector (CAN1) and C-126 intermediate connector.
caution A digital multimeter should be used. For details refer to .
caution The test wiring harness should be used. For details refer to .
(1)Disconnect joint connector (CAN1) and the intermediate connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.
(4)Continuity between joint connector (CAN1) terminal No.11 and C-126 intermediate connector terminal No.15
OK: Continuity (2 Ω or less)
(5)Continuity between joint connector (CAN1) terminal No.22 and C-126 intermediate connector terminal No.16
OK: Continuity (2 Ω or less)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?
<All the resistances measure 2 Ω or less> Follow diagnosis item 13, 14, 16, 17, 18, 19, 20, 21and 22. Refer to .
NO : <Either or all of the resistances measure more than 2 Ω> Repair the wiring harness between joint connector (CAN1) and intermediate connector C-126.