Part 1

NETWORKING: CAN COMMUNICATION SYSTEM: Check CAN Bus Line for Short to GND
- Check CAN Bus Line for Short to GND

DESCRIPTION

There may be a short circuit between the CAN bus main wire and GND when there is no resistance between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of the DLC3.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
* Turn the ignition switch off before inspecting CAN bus wires for a ground short.
* After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT
* Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR)

(a) Turn the ignition switch off.

(b) Disconnect the CAN No. 1 junction connector (D56).

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Standard Resistance:

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NG -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - CAN NO. 1 JUNCTION CONNECTOR)
OK -- Continue to next step.

2. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR)

(a) Disconnect the CAN No. 1 junction connector (A44).

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Result:

C -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - ECM)

B -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU)
A -- Continue to next step.

3. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR)

(a) Disconnect the CAN No. 1 junction connector (D56).

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Result:

D -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - 4WD CONTROL ECU)

C -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

B -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)

A -- REPLACE CAN NO. 1 JUNCTION CONNECTOR

4. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - CAN NO. 1 JUNCTION CONNECTOR)

(a) Disconnect the CAN No. 2 junction connector.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPAIR CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 JUNCTION CONNECTOR - CAN NO. 1 JUNCTION CONNECTOR)
OK -- Continue to next step.

5. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

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Result:

E -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - STEERING ANGLE SENSOR)

D -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU)

C -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - YAW RATE SENSOR)

B -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)
A -- Continue to next step.

6. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

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Result:

E -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - CERTIFICATION ECU)

D -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - COMBINATION METER)

C -- CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR - POWER STEERING ECU)

B -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

A -- REPLACE CAN NO. 2 JUNCTION CONNECTOR

7. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

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NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU)

OK -- REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) Removal

8. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - ECM)

(a) Disconnect the ECM connector.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

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Result:

C -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - ECM)

B -- REPLACE ECM Removal

A -- REPLACE ECM Removal

9. CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the air conditioning amplifier connector.

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(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

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NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal