Mazdamanuals.com

DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.8) [(E)]

id1002x2004500

Caution

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

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

•  If the malfunctioning part is detected in the communication line, before disconnecting the related connector for inspection, press the connector in the connection direction to verify that there is no looseness or disconnection.

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

1.  Verify the CAN system-related module DTCs and the module displayed in red or blue on the M-MDS screen.

2.  Apply the communication error DTC and the module displayed in red or blue to the DTC output pattern and malfunctioning location, and select the possible cause for the diagnostic result and the reference for the inspection item. (See DTC Output Pattern And Malfunctioning Location)

Note

•  The open circuit location can be determined by the DTC indicated in the DTC output pattern and malfunctioning location chart. DTCs not listed in the chart are not used for the determination of the open circuit location. (See DTC Output Pattern And Malfunctioning Location.)

•  The module may be displayed in red or blue on the M-MDS screen even if there is no malfunction depending on the vehicle specification.

3.  Inspect the possible cause and inspection item of the applicable malfunctioning part.

DTC Output Pattern And Malfunctioning Location

A

Possible cause

•  Connector terminal disconnection, poor contact, damage, deformation, corrosion

•  Emergency call unit power supply voltage or body ground malfunction

•  Body control module (BCM) power supply voltage or body ground malfunction

•  Open circuit in wiring harness between emergency call unit and body control module (BCM)

•  Emergency call unit malfunction

•  Body control module (BCM) malfunction

System wiring diagram

am3zzw00030343

Inspection item

•  Emergency call unit power supply voltage-related wiring harness and fuse

•  Emergency call unit body ground related wiring harness

•  Emergency call unit connector

•  Body control module (BCM) power supply voltage-related wiring harness and fuse

•  Body control module (BCM) body ground related wiring harness

•  Body control module (BCM) connector

•  Wiring harness between emergency call unit terminal 1Q and body control module (BCM) terminal 3V

•  Wiring harness between emergency call unit terminal 1S and body control module (BCM) terminal 3U

•  Body control module (BCM)

•  Emergency call unit