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Home >> Mazda >> 2021 >> 3 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - HS/Ms - Can >> DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No. 1) (US) >> Determination Procedure

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 battery terminal before performing any work that requires handling of connectors.
DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No. 1) (US) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
Yes Go to Step 3.
No Go to the next step.
2 INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY
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 Repair or replace the wiring harness between the body control module (BCM) and connector C-40 because the wiring harness is shorted to the power supply.
3 INSPECT CAN LINE BETWEEN EPS CONTROL MODULE AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at EPS control module terminals 2C and 2A.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 5.
No Go to the next step.
4 INSPECT EPS CONTROL MODULE FOR SHORT TO POWER SUPPLY
Yes Replace the EPS control module because there is a short to the power supply in the EPS control module.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION (US) .)
No Repair or replace the wiring harness between the EPS control module and connector C-40 because the wiring harness is shorted to the power supply.
5 INSPECT CAN LINE BETWEEN AFS CONTROL MODULE/AUTO LEVELING CONTROL MODULE AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at AFS control module/auto leveling control module terminals I and J.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 7.
No Go to the next step.
6 INSPECT AFS CONTROL MODULE/AUTO LEVELING CONTROL MODULE FOR SHORT TO POWER SUPPLY
Yes Replace the AFS control module/auto leveling control module because there is a short to the power supply in the AFS control module/auto leveling control module.
(See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness between the AFS control module/auto leveling control module and connector C-40 because the wiring harness is shorted to the power supply.
7 INSPECT CAN LINE BETWEEN CONNECTOR C-13 AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-13 and connector C-40 because the wiring harness is shorted to the power supply.
8 INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND CONNECTOR C-13 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-21 and connector C-13 because the wiring harness is shorted to the power supply.
9 INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND PCM FOR SHORT TO POWER SUPPLY
  • Measure the voltage at PCM terminals 2S and 2T.
  • Is the voltage between 1.5-3.5 V?
Yes Go to the next step.
No Go to Step 13.
10 INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND CONNECTORS C-55, C-56 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between connector C-21 and connectors C-55, C-56 because the wiring harness is shorted to the power supply.
11 INSPECT CAN LINE BETWEEN SAS CONTROL MODULE AND CONNECTORS C-55, C-56 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at PCM terminals 2S and 2T.
  • Is the voltage between 1.5-3.5 V?
Yes Go to the next step.
No Repair or replace the wiring harness between the connectors C-55, C-56 and connector C-21 because the wiring harness is shorted to the power supply.
12 INSPECT SAS CONTROL MODULE FOR SHORT TO POWER SUPPLY
Yes Replace the SAS control module connector because there is a short to the power supply in the SAS control module connector.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)
No Repair or replace the wiring harness between the SAS control module and connectors C-55, C-56 because the wiring harness is shorted to the power supply.
13 INSPECT CAN LINE BETWEEN CONNECTOR C-07 AND CONNECTOR C-21 FOR SHORT TO POWER SUPPLY
Yes
  • Go to the next step. (VIN Y) (with connectors C-37, C-36)
  • Go to Step 16. (VIN Y) (without connectors C-37, C-36)
  • Go to Step 17. (VINs 7, L, M) (MTX)) (with connectors C-37, C-36)
  • Go to Step 17. (VINs 7, L, M) (MTX)) (without connectors C-37, C-36)
No Repair or replace the wiring harness between the connector C-07 and connector C-21 because the wiring harness is shorted to the power supply.
14 INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-07 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Go to Step 17.
15 INSPECT CAN LINE BETWEEN CONNECTOR C-07 AND CONNECTOR C-02/CONNECTORS C-37, C-36 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-07 and connector C-02/connectors C-37, C-36 because the wiring harness is shorted to the power supply.
16 INSPECT TCM FOR SHORT TO POWER SUPPLY
Yes Replace the TCM because there is a short to the power supply in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [GW6AX-EL (US)] .)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL (US)] .)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL] .)
No Repair or replace the wiring harness between the TCM and connector C-02 because the wiring harness is shorted to the power supply.
17 INSPECT CAN LINE BETWEEN DSC HU/CM AND CONNECTORS C-37, C-36 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at DSC HU/CM terminals L and J.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 19.
No Go to the next step.
18 INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY
Yes Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)] .)
No Repair or replace the wiring harness between the DSC HU/CM and connectors C-37, C-36 because the wiring harness is shorted to the power supply.
19 INSPECT PCM FOR SHORT TO POWER SUPPLY
Yes Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [(VIN 7 & VIN L) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN M) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN Y) (US)] .)
No Repair or replace the wiring harness between the PCM and connectors C-37, C-36 because the wiring harness is shorted to the power supply.
20 INSPECT CAN LINE BETWEEN TCM AND CONNECTOR C-02 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Go to Step 22.
21 INSPECT TCM FOR SHORT TO POWER SUPPLY
Yes Replace the TCM because there is a short to the power supply in the TCM.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [GW6AX-EL (US)] .)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL (US)] .)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL] .)
No Repair or replace the wiring harness between the TCM and connector C-02 because the wiring harness is shorted to the power supply.
22 INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-02 FOR SHORT TO POWER SUPPLY
Yes
  • Go to the next step. Components LocationVINs 7, L, M (ATX))
  • Go to Step 24. (VINs 7, L, M (MTX))
No Repair or replace the wiring harness between the connectors C-37, C-36 and connector C-02 because the wiring harness is shorted to the power supply.
23 INSPECT PCM FOR SHORT TO POWER SUPPLY
Yes Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [(VIN 7 & VIN L) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN M) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN Y) (US)] .)
No Repair or replace the wiring harness between the PCM and connector C-07 because the wiring harness is shorted to the power supply.
24 INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-07 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connectors C-37, C-36 and connector C-07 because the wiring harness is shorted to the power supply.
25 INSPECT CAN LINE BETWEEN DSC HU/CM AND CONNECTORS C-37, C-36 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at DSC HU/CM terminals L and J.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 27.
No Go to the next step.
26 INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY
Yes Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM,
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)] .)
No Repair or replace the wiring harness between the DSC HU/CM and connectors C-37, C-36 because the wiring harness is shorted to the power supply.
27 INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-02 FOR SHORT TO POWER SUPPLY
Yes
  • Go to Step 30. (VINs 7, L, M) (ATX))
  • Go to Step 34. (VINs 7, L, M) (MTX))
No Repair or replace the wiring harness between the connectors C-37, C-36 and connector C-02 because the wiring harness is shorted to the power supply.
28 INSPECT CAN LINE BETWEEN DSC HU/CM AND CONNECTOR C-07/CONNECTOR C-02 FOR SHORT TO POWER SUPPLY
Yes
  • Go to Step 30. (VINs 7, L, M) (ATX))
  • Go to Step 34. (VINs 7, L, M) (MTX))
No Go to the next step.
29 INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY
Yes Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM.
(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)] .)
No Repair or replace the wiring harness between the DSC HU/CM and connector C-07/connector C-02 because the wiring harness is shorted to the power supply.
30 INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between the connector C-02 and connector C-38 because the wiring harness is shorted to the power supply.
31 INSPECT CAN LINE BETWEEN TCM AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at TCM terminals E and F.
  • Is the voltage between 1.5-3.5 V?
Yes Go to Step 33.
No Go to the next step.
32 INSPECT TCM FOR SHORT TO POWER SUPPLY
Yes Replace the TCM because there is a short to the power supply in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [GW6AX-EL (US)] .)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL (US)] .)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL] .)
No Repair or replace the wiring harness between the TCM and connector C-38 because the wiring harness is shorted to the power supply.
33 INSPECT CAN LINE BETWEEN CONNECTOR C-38 AND CONNECTOR C-01 FOR SHORT TO POWER SUPPLY
Yes Go to Step 35.
No Repair or replace the wiring harness between connector C-38 and connector C-01 because the wiring harness is shorted to the power supply.
34 INSPECT CAN LINE BETWEEN CONNECTOR C-01 AND CONNECTOR C-02 FOR SHORT TO POWER SUPPLY
Yes Go to the next step.
No Repair or replace the wiring harness between connector C-01 and connector C-02 because the wiring harness is shorted to the power supply.
35 INSPECT PCM FOR SHORT TO POWER SUPPLY
Yes Replace the PCM because there is a short to the power supply in the PCM.
(See PCM REMOVAL/INSTALLATION [(VIN 7 & VIN L) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN M) (US)] .)
(See PCM REMOVAL/INSTALLATION [(VIN Y) (US)] .)
No Repair or replace the wiring harness between the PCM and connector C-01 because the wiring harness is shorted to the power supply.