Diagnostic Item 12: Diagnose the terminator resistor at one end <LH drive vehicles>


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.


TROUBLE JUDGMENT


The terminator resistor at one end of CAN bus lines is damaged when the resistance between the CAN bus lines (CAN_L and H lines) is 120 ± 20 Ω.

COMMENTS ON TROUBLE SYMPTOM


The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or the combination meter or the engine-ECU <M/T> or engine-A/T-ECU may be defective.

TROUBLESHOOTING HINTS



DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-125 intermediate connector

caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

STEP 2. Resistance measurement at the C-125 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 connector, and measure at its male-side connector (at the front wiring harness side).
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Resistance between C-125 intermediate connector terminal Nos.26 and 27
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> Go to Step 3.

<120 ± 20 Ω not within> Go to Step 7.

STEP 3. Connector check: C-09 joint connector (CAN2) and C-02 combination meter connector


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 is not damaged.

Q. Are the check results normal?

Go to Step 4.

Repair the connector, or replace the joint connector.

STEP 4. Resistance measurement at C-09 joint connector (CAN2).
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 connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Resistance between C-09 joint connector (CAN2) terminal Nos.7 and 18
OK: 120 ± 20 Ω

Q. Is the check result normal?

<120 ± 20 within Ω> Diagnose CAN bus lines thoroughly. Refer to .

<120 ± 20 Ω not within> Go to Step 5.

STEP 5. Resistance measurement at C-09 joint connector (CAN2) and C-02 combination meter 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 (CAN2) and the combination meter connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(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 C-09 joint connector (CAN2) terminal No.7 and C-02 combination meter connector terminal No.24
OK: 2 Ω or less

(5)Continuity between C-09 joint connector (CAN2) terminal No.18 and C-02 combination meter connector terminal No.23
OK: 2 Ω or less
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Are the check results normal?

<All the voltages measure 2 Ω or less> Go to Step 6 .

<Either or all of the resistances measure more than 2 Ω> Repair the wiring harness between joint connector (CAN2) and the combination meter connector.

STEP 6. Resistance measurement at C-02 combination meter connector.
caution A digital multimeter should be used. For details refer to .

(1)Remove the combination meter, and measure at the equipment side.

(2)Resistance between C-02 combination meter connector terminal Nos.23 and 24
OK: 120 ± 20 Ω

Q. Is the check result normal?

<120 ± 20 within Ω> Diagnose CAN bus lines thoroughly. Refer to .

<120 ± 20 not within Ω> Replace the combination meter.

STEP 7. Connector check: A-07 joint connector (CAN1), A-16 intermediate connector and C-112 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector
note When checking A-07 joint connector (CAN1), disassemble and check the engine compartment relay box by referring to .



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 is not damaged.

Q. Are the check results normal?

Go to Step 8.

Repair the connector, or replace the joint connector (front wiring harness assembly).

STEP 8. Resistance measurement at the A-16 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 connector, and measure at its male-side intermediate connector (at the control wiring harness side).
(2)Ignition switch: OFF (LOCK)
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.

(4)Resistance between A-16 intermediate connector terminal Nos.6 and 12
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> Go to Step 9.

<120 ± 20 Ω not within> Go to Step 10.

STEP 9. Resistance measurement at A-07 joint connector (CAN1) and A-16 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 (CAN1) and the intermediate connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(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 A-07 joint connector (CAN1) terminal No.3 and A-16 intermediate connector terminal No.12
OK: 2 Ω or less

(5)Continuity between A-07 joint connector (CAN1) terminal No.6 and A-16 intermediate connector terminal No.6
OK: 2 Ω or less
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Are the check results normal?

<All the voltages measure 2 V or less> Diagnose CAN bus lines thoroughly. Refer to .

<Either or all of the resistances measure more than 2 Ω> Repair the wiring harness between joint connector (CAN1) and the intermediate connector.

STEP 10. Resistance measurement at A-16 intermediate connector and C-112 engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector and the intermediate connector, and measure at the wiring harness side.
(2)Ignition switch: OFF (LOCK)
(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 A-16 intermediate connector terminal No.6 and C-112 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector terminal No.61.
OK: 2 Ω or less

(5)Continuity between A-16 intermediate connector terminal No.12 and C-112 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector terminal No.62.
OK: 2 Ω or less
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Are the check results normal?

<All the voltages measure 2 Ω or less> Go to Step 11 .

<Either or all of the resistances measure more than 2 Ω> Repair the wiring harness between the engine-ECU <M/T> or engine-A/T-ECU <A/T> connector and the intermediate connector.

STEP 11. Resistance measurement at C-112 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector.
caution A digital multimeter should be used. For details refer to .

(1)Remove the engine-ECU <M/T> or engine-A/T-ECU <A/T>, and measure at the equipment side.

(2)Resistance at C-112 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector terminal Nos.61 and 62
OK: 120 ± 20 Ω

Q. Is the check result normal?

<120 ± 20 within Ω> Diagnose CAN bus lines thoroughly. Refer to .

<120 ± 20 Ω not within> Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.