DETERMINING SHORT TO GROUND LOCATION (CAN-BUS No.2) [R.H.D.]

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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 [R.H.D.].)

Warning

<<High voltage>>

• Always observe the following thoroughly to ensure safety when inspecting or removing/installing parts in the motor compartment. Otherwise, the high voltage circuit may operate on the vehicle regardless of whether or not the main power is switched OFF or ON (READY off or on). If this occurs, it could cause electrical shock and result in serious injury or, in the worst case, death.

― Do not select high voltage battery cooling on center display after EV system stops

― Do not open/close doors frequently with main power switched OFF

― Do not perform normal charging or quick charging

― Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

― Cancel climate control timer

― Operate center display and turn off battery heater operation

Warning

• The cooling fan may suddenly start operating regardless of the main power switch position. Keep hands and tools away from the cooling fan even if the cooling fan is not operating to prevent injury, or damage to the cooling fan. When servicing the cooling fan or parts near the cooling fan, ensure the following.

― Do not perform normal charging or quick charging

― Do not select high voltage battery cooling on center display after EV system stops

― Do not open/close doors frequently with main power switched OFF

― Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

― Cancel climate control timer

― Operate center display and turn off battery heater operation

Warning

<<High voltage>>

• If the necessary measures are not taken before servicing an electric vehicle, it could cause electrical shock and result in serious injury or, in the worst case, death. Before servicing the electric vehicle, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and implement the necessary measures. (See HIGH VOLTAGE SERVICE CAUTIONS.)

High Voltage Part Inspection And Removal/Installation Notes

Warning

<<High voltage>>

• If necessary measures such as wearing the correct protective gear are not taken when inspecting or removing/installing the high voltage parts, it could cause electrical shock and result in serious injury or, in the worst case, death.

• Before inspecting or removing/installing the high voltage parts, refer to [HIGH VOLTAGE SERVICE CAUTIONS] in the general information and [High Voltage Part Inspection and Removal/Installation Notes] of the high voltage system service cautions and implement the necessary measures and preparations. (See HIGH VOLTAGE SERVICE CAUTIONS.) (See HIGH VOLTAGE SYSTEM SERVICE CAUTIONS.)

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-34

•  Switch the main power OFF.

•  Disconnect the negative lead-acid battery terminal.
(See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION)

•  Disconnect 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 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 PARKING LOCK ACTUATOR AND CONNECTOR C-01

•  Disconnect the connector C-01.

•  Inspect for continuity at the following terminals:

―  Between parking lock actuator terminal C and body ground.

―  Between parking lock actuator terminal D and body ground.

•  Is there continuity?

Yes

Repair or replace the wiring harness between the body control module (BCM) and connector C-34and connector C-01 because the wiring harness is shorted to ground.

No

Go to the next step.

4

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 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 [A71M].)

5

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 7.

6

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-07 and connector 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 [R.H.D.].)

7

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

Repair or replace the wiring harness between the connector C-04 and connector C-34 because the wiring harness is shorted to ground.

No

Go to the next step.

8

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.

9

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 11.

10

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 REMOVAL/INSTALLATION [A71M].)

11

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.

12

INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-18 AND CONNECTOR C-48

•  Disconnect the connector C-48.

•  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 connector C-18 and connector C-48 because the wiring harness is shorted to ground.

No

Go to the next step.

13

INSPECT FOR SHORT TO GROUND BETWEEN PCM AND CONNECTOR C-48

•  Inspect for continuity at the following terminals:

―  Between PCM terminal AW and body ground

―  Between PCM terminal AX and body ground

•  Is there continuity?

Yes

Go to Step 17.

No

Go to the next step.

14

INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-48 AND CONNECTOR C-64

•  Disconnect the connector C-64.

•  Connect the connector C-48.

•  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-48 and connector C-64 because the wiring harness is shorted to ground.

No

Go to the next step.

15

INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-64 AND CONNECTOR C-66

•  Disconnect the connector C-66.

•  Connect the connector C-64.

•  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-64 and connector C-66 because the wiring harness is shorted to ground.

No

Go to the next step.

16

INSPECT CAN LINE IN DRIVE MOTOR CONTROL MODULE FOR SHORT TO GROUND

Warning

<<High voltage>>

•  Wear insulating gloves when working on a high voltage system.

•  Disconnect the drive motor control module connector.

•  Inspect for continuity at the following terminals:

―  Between drive motor control module terminal 3I (wiring harness side) and body ground

―  Between drive motor control module terminal 3J (wiring harness side) and body ground

•  Is there continuity?

Yes

Repair or replace the wiring harness between the drive motor control module and connector C-66 because the wiring harness is shorted to ground.

No

Replace the drive motor control module because there is a short to ground in the drive motor control module.

(See INVERTER REMOVAL/INSTALLATION.)

17

INSPECT CAN LINE IN PCM FOR SHORT TO GROUND

•  Disconnect the PCM connector.

•  Inspect for continuity at the following terminals:

―  Between PCM terminal AW (wiring harness side) and body ground

―  Between PCM terminal AX (wiring harness side) and body ground

•  Is there continuity?

Yes

Repair or replace the wiring harness between the PCM and connector C-48 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.)

Step	Inspection		Action
1	INSPECT FOR SHORT TO GROUND BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-34 • Switch the main power OFF. • Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION) • Disconnect 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.
1		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.
2		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 PARKING LOCK ACTUATOR AND CONNECTOR C-01 • Disconnect the connector C-01. • Inspect for continuity at the following terminals: ― Between parking lock actuator terminal C and body ground. ― Between parking lock actuator terminal D and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness between the body control module (BCM) and connector C-34and connector C-01 because the wiring harness is shorted to ground.
3		No	Go to the next step.
4	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 because the wiring harness is shorted to ground.
4		No	Replace the parking lock actuator because there is a short to ground in the parking lock actuator. (See PARKING LOCK ACTUATOR REMOVAL/INSTALLATION [A71M].)
5	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.
5		No	Go to Step 7.
6	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-07 and connector C-34 because the wiring harness is shorted to ground.
6		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 [R.H.D.].)
7	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	Repair or replace the wiring harness between the connector C-04 and connector C-34 because the wiring harness is shorted to ground.
7		No	Go to the next step.
8	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.
8		No	Go to the next step.
9	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.
9		No	Go to Step 11.
10	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.
10		No	Replace the selector lever because there is a short to ground in the selector lever. (See SELECTOR LEVER REMOVAL/INSTALLATION [A71M].)
11	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.
11		No	Go to the next step.
12	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-18 AND CONNECTOR C-48 • Disconnect the connector C-48. • 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 connector C-18 and connector C-48 because the wiring harness is shorted to ground.
12		No	Go to the next step.
13	INSPECT FOR SHORT TO GROUND BETWEEN PCM AND CONNECTOR C-48 • Inspect for continuity at the following terminals: ― Between PCM terminal AW and body ground ― Between PCM terminal AX and body ground • Is there continuity?	Yes	Go to Step 17.
13		No	Go to the next step.
14	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-48 AND CONNECTOR C-64 • Disconnect the connector C-64. • Connect the connector C-48. • 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-48 and connector C-64 because the wiring harness is shorted to ground.
14		No	Go to the next step.
15	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-64 AND CONNECTOR C-66 • Disconnect the connector C-66. • Connect the connector C-64. • 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-64 and connector C-66 because the wiring harness is shorted to ground.
15		No	Go to the next step.
16	INSPECT CAN LINE IN DRIVE MOTOR CONTROL MODULE FOR SHORT TO GROUND Warning <<High voltage>> • Wear insulating gloves when working on a high voltage system. • Disconnect the drive motor control module connector. • Inspect for continuity at the following terminals: ― Between drive motor control module terminal 3I (wiring harness side) and body ground ― Between drive motor control module terminal 3J (wiring harness side) and body ground • Is there continuity?	Yes	Repair or replace the wiring harness between the drive motor control module and connector C-66 because the wiring harness is shorted to ground.
16		No	Replace the drive motor control module because there is a short to ground in the drive motor control module. (See INVERTER REMOVAL/INSTALLATION.)
17	INSPECT CAN LINE IN PCM FOR SHORT TO GROUND • Disconnect the PCM connector. • Inspect for continuity at the following terminals: ― Between PCM terminal AW (wiring harness side) and body ground ― Between PCM terminal AX (wiring harness side) and body ground • Is there continuity?	Yes	Repair or replace the wiring harness between the PCM and connector C-48 because the wiring harness is shorted to ground.
17		No	Replace the PCM because there is a short to ground in the PCM. (See PCM REMOVAL/INSTALLATION.)