Diagnostic Item 11: Diagnose the terminator resistors at both ends <RH 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


If the resistance between the CAN bus lines (CAN_L and CAN_H) is infinite, the terminator resistors in the CAN bus lines are broken, or there is an open circuit in the wiring harness from the diagnosis connector to the terminator resistors.

COMMENTS ON TROUBLE SYMPTOM


The CAN bus line harness wires or connectors may be damaged (open circuit may be present on CAN_L or CAN_H line between the diagnosis connector and CAN main bus lines, or CAN main bus lines may be open at both sides), or the combination meter and the 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 female-side intermediate connector (at the instrument panel 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 8.

<Not within 120 ± 20 Ω> Go to Step 3.

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 result normal?

Go to Step 4.

Repair the connector, or replace the joint connector. Then go to Step 2.

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.6 and 17
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> Go to Step 7.

<Not within 120 ± 20 Ω> 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.6 and C-02 combination meter connector terminal No.24
OK: 2 Ω or less

(5)Continuity between C-09 joint connector (CAN2) terminal No.17 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 result normal?

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

<Either or all of the voltages measure more than 2 Ω> Repair the wiring harness between joint connector (CAN2) and the combination meter connector, and then go to Step 2.

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?

<Within 120 ± 20 Ω> Go to Step 2.

<Not within 120 ± 20 Ω> Replace the combination meter, and then go to Step 2.

STEP 7. Resistance measurement at C-125 intermediate connector and 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 joint connector (CAN2) 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 C-125 intermediate connector terminal No.26 and C-09 joint connector (CAN2) terminal No.11
OK: 2 Ω or less

(5)Continuity between C-125 intermediate connector terminal No.27 and C-09 joint connector (CAN2) terminal No.22
OK: 2 Ω or less
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Are the check result normal?

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

<Either or all of the voltages measure more than 2 Ω> Repair the wiring harness between joint connector (CAN2) and the intermediate connector, and then go to Step 2.

STEP 8. 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 intermediate 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 16.

<Not within 120 ± 20 Ω> Go to Step 9.

STEP 9. Connector check: A-07 joint connector (CAN1), A-16 intermediate connector and C-112 engine-A/T-ECU 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 result normal?

Go to Step 10.

Repair the connector, or replace the joint connector (front wiring harness assembly). Then go to Step 8.

STEP 10. Resistance measurement at the A-07 joint connector (CAN1).
note When checking A-07 joint connector (CAN1), disassemble and check the engine compartment relay box by referring to .
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 A-07 joint connector (CAN1) terminal Nos.3 and 6.
OK: 120 ± 20 Ω

Q. Is the check result normal?

<Within 120 ± 20 Ω> Go to Step 15.

<Not within 120 ± 20 Ω> Go to Step 11.

STEP 11. 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 12.

<Not within 120 ± 20 Ω> Go to Step 13.

STEP 12. 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 result normal?

<All the voltages measure 2 Ω or less> Go to Step 8 .

<Either or all of the voltages measure more than 2 Ω> Repair the wiring harness between joint connector (CAN1) and the intermediate connector, and then go to Step 8.

STEP 13. Resistance measurement at A-16 intermediate connector and C-112 engine-A/T-ECU 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-A/T-ECU 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-A/T-ECU connector terminal No.61.
OK: 2 Ω or less

(5)Continuity between A-16 intermediate connector terminal No.12 and C-112 engine-A/T-ECU 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 result normal?

<All the voltages measure 2 Ω or less> Go to Step 14 .

<Either or all of the voltages measure more than 2 Ω> Repair the wiring harness between the engine-A/T-ECU connector and the intermediate connector, and then go to Step 8.

STEP 14. Resistance measurement at C-112 engine-A/T-ECU connector.
caution A digital multimeter should be used. For details refer to .


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

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

Q. Is the check result normal?

<Within 120 ± 20 Ω> Go to Step 8.

<Not within 120 ± 20 Ω> Replace the engine-A/T-ECU, and then go to Step 8.

STEP 15. Resistance measurement at C-125 intermediate connector and A-07 joint connector (CAN1).
note When checking A-07 joint connector (CAN1), disassemble and check the engine compartment relay box by referring to .
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 C-125 intermediate connector terminal No.26 and A-07 joint connector (CAN1) terminal No.4
OK: 2 Ω or less

(5)Continuity between C-125 intermediate connector terminal No.27 and A-07 joint connector (CAN1) terminal No.1
OK: 2 Ω or less
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Are the check result normal?

<All the voltages measure 2 Ω or less> Go to Step 8 .

<Either or all of the voltages measure more than 2 Ω> Repair the wiring harness between joint connector (CAN1) and the intermediate connector, and then go to Step 8.

STEP 16. Connector check: C-126 diagnosis 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 17.

Repair the connector, or replace the joint connector. Then go to Step 17.

STEP 17. Resistance measurement at C-09 joint connector (CAN2) and C-126 diagnosis 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 diagnosis 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-126 diagnosis connector terminal No.6
OK: 2 Ω or less

(5)Continuity between C-09 joint connector (CAN2) terminal No.18 and C-126 diagnosis connector terminal No.14
OK: 2 Ω or less
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Are the check result normal?

YES <all the resistances measure 2 Ω or less: When any repair done> : Retest the system.

YES <all the resistances measure 2 Ω or less: When no repair done> : Diagnose CAN bus lines thoroughly. Refer to .

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