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

id100226002300

Caution
•  Perform the following malfunction diagnosis only when it is diagnosed with a short to power supply 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

a30zzw00006559

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.
•  Disconnect the negative lead-acid battery terminal before performing any work that requires handling of connectors.

Step

Inspection

Action
1
INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F.
•  Connect the connector C-34.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F (wiring harness side).
•  Is the voltage between 1.5—3.5 V?
Yes
Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM).
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No
Go to the next step.
2
INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-34 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-34.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Is the voltage between 1.5—3.5 V?
Yes
Go to Step 5.
No
Go to the next step.
3
INSPECT CAN LINE BETWEEN PARKING LOCK ACTUATOR AND CONNECTOR C-01
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-01.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the body control module (BCM), connector C-34 and connector C-01 because the wiring harness is shorted to the power supply.
4
INSPECT PARKING LOCK ACTUATOR FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the parking lock actuator connector.
•  Connect the connector C-01.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Replace the parking lock actuator because there is a short to the power supply in the parking lock actuator.
(See PARKING LOCK ACTUATOR REMOVAL/INSTALLATION [A71M].)
No
Repair or replace the wiring harness between the parking lock actuator and connector C-01 because the wiring harness is shorted to the power supply.
5
INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-04 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-04.
•  Connect the connector C-34.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to Step 7.
No
Go to the next step.
6
INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the electronically controlled brake unit connector.
•  Connect the connector C-04.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Replace the electronically controlled brake unit because there is a short to the power supply in the electronically controlled brake unit.
(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
No
Repair or replace the wiring harness between the electronically controlled brake unit and connector C-04 and connector C-34 because the wiring harness is shorted to the power supply.
7
INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-04 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-04.
•  Connect the connector C-34.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the connector C-04 and connector C-34 because the wiring harness is shorted to the power supply.
8
INSPECT CAN LINE BETWEEN CONNECTOR C-04 AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-39.
•  Connect the connector C-04.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the connector C-04 and connector C-39 because the wiring harness is shorted to the power supply.
9
INSPECT CAN LINE BETWEEN SELECTOR LEVER AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY
•  Measure the voltage at selector lever terminals H and F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to Step 11.
No
Go to the next step.
10
INSPECT SELECTOR LEVER FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the selector lever connector.
•  Connect the connector C-39.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Replace the selector lever because there is a short to the power supply in the selector lever.
(See SELECTOR LEVER REMOVAL/INSTALLATION [A71M].)
No
Repair or replace the wiring harness between the selector lever and connector C-39 because the wiring harness is shorted to the power supply.
11
INSPECT CAN LINE BETWEEN CONNECTOR C-39 AND CONNECTOR C-18 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-18.
•  Connect the connector C-39.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the connector C-39 and connector C-18 because the wiring harness is shorted to the power supply.
12
INSPECT CAN LINE BETWEEN CONNECTOR C-18 AND CONNECTOR C-48 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-48.
•  Connect the connector C-18.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the connector C-48 and connector C-18 because the wiring harness is shorted to the power supply.
13
INSPECT CAN LINE BETWEEN PCM AND CONNECTOR C-48 FOR SHORT TO POWER SUPPLY
•  Measure the voltage at PCM terminals AW and AX.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Go to Step 17.
14
INSPECT CAN LINE BETWEEN CONNECTOR C-48 AND CONNECTOR C-64 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-64.
•  Connect the connector C-48.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the connector C-64 and connector C-48 because the wiring harness is shorted to the power supply.
15
INSPECT CAN LINE BETWEEN CONNECTOR C-64 AND CONNECTOR C-66 FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the connector C-64.
•  Connect the connector C-66.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between the connector C-64 and connector C-66 because the wiring harness is shorted to the power supply.
16
INSPECT DRIVE MOTOR CONTROL MODULE FOR SHORT TO POWER SUPPLY
Warning
<<High voltage>>
•  Wear insulating gloves when working on a high voltage system.
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the drive motor control module connector.
•  Connect the connector C-66.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Replace the drive motor control module connector because there is a short to the power supply in the drive motor control module connector.
(See INVERTER REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between the drive motor control module and connector C-66 because the wiring harness is shorted to the power supply.
17
INSPECT PCM FOR SHORT TO POWER SUPPLY
•  Switch the main power OFF.
•  Disconnect the negative lead-acid battery terminal.
•  Disconnect the PCM connector.
•  Connect the connector C-48.
•  Connect the negative lead-acid battery terminal.
•  Switch the main power ON (READY off).
•  Measure the voltage at body control module (BCM) terminals 2H and 2F.
•  Is the voltage between 1.5—3.5 V?
Yes
Replace the PCM because there is a short to the power supply in the PCM.
(See PCM REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between the PCM and connector C-48 because the wiring harness is shorted to the power supply.