DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.2)

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Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to ground by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

System Wiring Diagram

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Determination Procedure

Caution

•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.

Step	Inspection		Action
1	INSPECT FOR SHORT TO GROUND BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-01 •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION) •  Disconnect the connector C-01. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 5.
2	INSPECT CAN LINE IN BODY CONTROL MODULE (BCM) FOR SHORT TO GROUND •  Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H (wiring harness side) and body ground ―  Between body control module (BCM) terminal 2F (wiring harness side) and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Replace the body control module (BCM) because there is a short to ground in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
3	INSPECT FOR SHORT TO GROUND BETWEEN INTEGRATED STARTER GENERATOR (ISG) AND CONNECTOR C-02 •  Disconnect the connector C-02. •  Inspect for continuity at the following terminals: ―  Between integrated starter generator (ISG) terminal 1C and body ground ―  Between integrated starter generator (ISG) terminal 1D and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the body control module (BCM) and connectors C-01, C-02 because the wiring harness is shorted to ground.
4	INSPECT CAN LINE IN INTEGRATED STARTER GENERATOR (ISG) FOR SHORT TO GROUND •  Disconnect the integrated starter generator (ISG) connector. •  Inspect for continuity at the following terminals: ―  Between integrated starter generator (ISG) terminal 1C (wiring harness side) and body ground. ―  Between integrated starter generator (ISG) terminal 1D (wiring harness side) and body ground. •  Is there continuity?	Yes	Repair or replace the wiring harness between the integrated starter generator (ISG) and connector C-02 because the wiring harness is shorted to ground.
		No	Replace the integrated starter generator (ISG) because there is a short to ground in the integrated starter generator (ISG). (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION.)
5	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-02 AND CONNECTOR C-01 •  Disconnect the connector C-02. •  Connect the connector C-01. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 7.
6	INSPECT CAN LINE IN PARKING LOCK ACTUATOR SHORT TO GROUND •  Disconnect the parking lock actuator connector. •  Inspect for continuity at the following terminals: ―  Between parking lock actuator terminal C (wiring harness side) and body ground. ―  Between parking lock actuator terminal D (wiring harness side) and body ground. •  Is there continuity?	Yes	Repair or replace the wiring harness between the parking lock actuator and connector C-01, C-02 because the wiring harness is shorted to ground.
		No	Replace the parking lock actuator because there is a short to ground in the parking lock actuator. (See PARKING LOCK ACTUATOR REMOVAL/INSTALLATION [ET6A-EL, ET6AX-EL].)
7	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-34 AND CONNECTOR C-02 •  Disconnect the connector C-34. •  Connect the connector C-02. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-34 and connector C-02 because the wiring harness is shorted to ground.
		No	Go to the next step.
8	INSPECT FOR SHORT TO GROUND BETWEEN DC-DC CONVERTER (Mazda M Hybrid) AND CONNECTOR C-34 •  Inspect for continuity at the following terminals: ―  Between DC-DC converter (Mazda M Hybrid) terminal 1C and body ground ―  Between DC-DC converter (Mazda M Hybrid) terminal 1D and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 10.
9	INSPECT CAN LINE IN DC-DC CONVERTER (Mazda M Hybrid) SHORT TO GROUND •  Disconnect the DC-DC converter (Mazda M Hybrid) connector. •  Inspect for continuity at the following terminals: ―  Between DC-DC converter (Mazda M Hybrid) terminal 1C (wiring harness side) and body ground. ―  Between DC-DC converter (Mazda M Hybrid) terminal 1D (wiring harness side) and body ground. •  Is there continuity?	Yes	Repair or replace the wiring harness between the DC-DC converter (Mazda M Hybrid) and connector C-34 because the wiring harness is shorted to ground.
		No	Replace the DC-DC converter (Mazda M Hybrid) because there is a short to ground in the DC-DC converter (Mazda M Hybrid). (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
10	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-04 AND CONNECTOR C-34 •  Disconnect the connector C-04. •  Connect the connector C-34. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 12.
11	INSPECT CAN LINE IN ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO GROUND •  Disconnect the electronically controlled brake unit connector. •  Inspect for continuity at the following terminals: ―  Between electronically controlled brake unit terminal 1D (wiring harness side) and body ground ―  Between electronically controlled brake unit terminal 1F (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the electronically controlled brake unit and connector C-04, C-34 because the wiring harness is shorted to ground.
		No	Replace the electronically controlled brake unit because there is a short to ground in the electronically controlled brake unit. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)
12	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-04 AND CONNECTOR C-39 •  Disconnect the connector C-39. •  Connect the connector C-04. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-04 and connector C-39 because the wiring harness is shorted to ground.
		No	Go to the next step.
13	INSPECT FOR SHORT TO GROUND BETWEEN SELECTOR LEVER AND CONNECTOR C-39 •  Inspect for continuity at the following terminals: ―  Between selector lever terminal H and body ground ―  Between selector lever terminal F and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 15.
14	INSPECT CAN LINE IN SELECTOR LEVER FOR SHORT TO GROUND •  Disconnect the selector lever connector. •  Inspect for continuity at the following terminals: ―  Between selector lever terminal H (wiring harness side) and body ground ―  Between selector lever terminal F (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the selector lever and connector C-39 because the wiring harness is shorted to ground.
		No	Replace the selector lever because there is a short to ground in the selector lever. (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION.)
15	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-77, C-76 AND CONNECTOR C-18 •  Disconnect the connectors C-77, C-76. •  Connect the connector C-18. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connectors C-77, C-76 and connector C-18 because the wiring harness is shorted to ground.
		No	Go to the next step.
16	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-39 AND CONNECTOR C-18 •  Disconnect the connector C-18. •  Connect the connector C-39. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-18 and connector C-39 because the wiring harness is shorted to ground.
		No	Go to the next step.
17	INSPECT FOR SHORT TO GROUND BETWEEN Mazda M Hybrid BATTERY AND CONNECTORS C-77, C-76 •  Inspect for continuity at the following terminals: ―  Between Mazda M Hybrid battery terminal 1B and body ground ―  Between Mazda M Hybrid battery terminal 1E and body ground •  Is there continuity?	Yes	Go to the next step.
		No	Go to Step 19.
18	INSPECT CAN LINE IN Mazda M Hybrid BATTERY FOR SHORT TO GROUND •  Disconnect the Mazda M Hybrid battery connector. •  Inspect for continuity at the following terminals: ―  Between Mazda M Hybrid battery terminal 1B (wiring harness side) and body ground ―  Between Mazda M Hybrid battery terminal 1E (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the Mazda M Hybrid battery and connectors C-77, C-76 because the wiring harness is shorted to ground.
		No	Replace the Mazda M Hybrid battery because there is a short to ground in the Mazda M Hybrid battery. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
19	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-09 AND CONNECTORS C-77, C-76 •  Disconnect the connector C-09. •  Connect the connectors C-77, C-76. •  Inspect for continuity at the following terminals: ―  Between body control module (BCM) terminal 2H and body ground ―  Between body control module (BCM) terminal 2F and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the connector C-09 and connectors C-77, C-76 because the wiring harness is shorted to ground.
		No	Go to the next step.
20	INSPECT CAN LINE IN PCM FOR SHORT TO GROUND •  Disconnect the PCM connector. •  Inspect for continuity at the following terminals: ―  Between PCM terminal 2M (wiring harness side) and body ground ―  Between PCM terminal 2N (wiring harness side) and body ground •  Is there continuity?	Yes	Repair or replace the wiring harness between the PCM and connector C-09 because the wiring harness is shorted to ground.
		No	Replace the PCM because there is a short to ground in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)