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DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN)

CAUTION:

System Wiring Diagram

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 DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.

  • Disconnect the negative battery cable before performing any work that requires handling of connectors.

NOTE:

  • If the ignition does not turn on even if the ignition is switched ON, switch the ignition ON referring to the forced ignition ON procedure. (See FORCED IGNITION ON.)

Step

Inspection

Action

1

 INSPECT CAN LINE BETWEEN BCM AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Go to the next step.

No

Go to Step 8.

2

 INSPECT CAN LINE BETWEEN PCM AND BCM FOR SHORT TO POWER SUPPLY

  • Measure the voltage at PCM terminals 2AK and 2AL.

  • Is the voltage between 1.5—3.5 V?

Yes

Replace the BCM because there is a short to the power supply in the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

3

 INSPECT CAN LINE BETWEEN CONNECTORS C-38 AND C-39 AND BCM FOR SHORT TO POWER SUPPLY

Yes

Go to the next step.

No

Repair or replace the wiring harness between the BCM and connectors C-38 and C-39 because the wiring harness is shorted to the power supply.

4

 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.)

No

Go to the next step.

5

 INSPECT EVP CONTROL UNIT FOR SHORT TO POWER SUPPLY

Yes

Replace the EVP control unit because there is a short to the power supply in the EVP control unit.

(See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

6

 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.)

No

Go to the next step.

7

 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 [SKYACTIV-G 2.0].)

No

Repair or replace the wiring harness between the PCM and connectors C-38 and C-39 because the wiring harness is shorted to the power supply.

8

 INSPECT CAN LINE BETWEEN CONNECTOR C-42 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Go to the next step.

No

Go to Step 12.

9

 INSPECT CAN LINE BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-42 FOR SHORT TO POWER SUPPLY

  • Measure the voltage at audio amplifier terminals 2L and 2N.

  • Is the voltage between 1.5—3.5 V?

Yes

Go to Step 11.

No

Go to the next step.

10

 INSPECT AUDIO AMPLIFIER FOR SHORT TO POWER SUPPLY

Yes

Replace the audio amplifier because there is a short to the power supply in the audio amplifier.

(See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness between the audio amplifier and connector C-42 because the wiring harness is shorted to the power supply.

11

 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 [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

No

Repair or replace the wiring harness between the TCM and connector C-42 and BCM because the wiring harness is shorted to the power supply.

12

 INSPECT CAN LINE BETWEEN CONNECTOR C-25 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Go to the next step.

No

Go to Step 15.

13

 INSPECT CAN LINE BETWEEN CONNECTOR C-30 AND CONNECTOR C-42 AND CONNECTOR C-25 FOR SHORT TO POWER SUPPLY

Yes

Repair or replace the wiring harness between the connector C-30 and connector C-42 and connector C-25 because the wiring harness is shorted to the power supply.

No

Go to the next step.

14

 INSPECT OCCUPANT CLASSIFICATION SENSOR FOR SHORT TO POWER SUPPLY

Yes

Replace the occupant classification sensor because there is a short to the power supply in the occupant classification sensor.

(See OCCUPANT CLASSIFICATION SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

No

Repair or replace the wiring harness between the occupant classification sensor and connector C-30 because the wiring harness is shorted to the power supply.

15

 INSPECT CAN LINE BETWEEN CONNECTOR C-14 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Repair or replace the wiring harness between the connector C-25 and connector C-14 because the wiring harness is shorted to the power supply.

No

Go to the next step.

16

 INSPECT CAN LINE BETWEEN CONNECTOR C-17 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Go to the next step.

No

Go to Step 19.

17

 INSPECT CAN LINE BETWEEN FORWARD SENSING CAMERA (FSC) AND CONNECTOR C-17 FOR SHORT TO POWER SUPPLY

  • Measure the voltage at forward sensing camera (FSC) terminals E and C.

  • Is the voltage between 1.5—3.5 V?

Yes

Repair or replace the wiring harness between the connector C-14 and connector C-17 because the wiring harness is shorted to the power supply.

No

Go to the next step.

18

 INSPECT FORWARD SENSING CAMERA (FSC) FOR SHORT TO POWER SUPPLY

Yes

Replace the forward sensing camera (FSC) because there is a short to the power supply in the forward sensing camera (FSC).

(See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness between the forward sensing camera (FSC) and connector C-17 because the wiring harness is shorted to the power supply.

19

 INSPECT CAN LINE BETWEEN CONNECTOR C-41 AND DLC-2 FOR SHORT TO POWER SUPPLY

Yes

Go to the next step.

No

Repair or replace the wiring harness between connector C-41 and DLC-2 because the wiring harness is shorted to the power supply.

20

 INSPECT CAN LINE BETWEEN AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE AND CONNECTORS C-28 AND C-29 FOR SHORT TO POWER SUPPLY

  • Measure the voltage at AFS control module / auto leveling control module terminals A and B.

  • Is the voltage between 1.5—3.5 V?

Yes

Go to Step 22.

No

Go to the next step.

21

 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 AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)

(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-41 because the wiring harness is shorted to the power supply.

22

 INSPECT CAN LINE BETWEEN START STOP UNIT AND CONNECTOR C-41 FOR SHORT TO POWER SUPPLY

  • Measure the voltage at start stop unit terminals 2M and 2O.

  • Is the voltage between 1.5—3.5 V?

Yes

Go to Step 25.

No

Go to the next step.

23

 INSPECT CAN LINE BETWEEN START STOP UNIT AND CONNECTOR C-19 FOR SHORT TO POWER SUPPLY

Yes

Go to Step 30.

No

Repair or replace the wiring harness between the connector C-41 and connector C-19 because the wiring harness is shorted to the power supply.

24

 INSPECT START STOP UNIT FOR SHORT TO POWER SUPPLY

Yes

Replace the start stop unit because there is a short to the power supply in the start stop unit.

(See START STOP UNIT REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness between the start stop unit and connector C-19 because the wiring harness is shorted to the power supply.

25

 INSPECT CAN LINE BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND CONNECTOR C-41 FOR SHORT TO POWER SUPPLY

  • Measure the voltage at connectivity master unit (CMU) terminals 2E and 2F.

  • Is the voltage between 1.5—3.5 V?

Yes

Go to Step 27.

No

Go to the next step.

26

 INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT TO POWER SUPPLY

Yes

Replace the connectivity master unit (CMU) because there is a short to the power supply in the connectivity master unit (CMU).

(See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness between the connectivity master unit (CMU) and connector C-41 because the wiring harness is shorted to the power supply.

27

 INSPECT CAN LINE BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-41 FOR SHORT TO POWER SUPPLY

  • Measure the voltage at instrument cluster terminals B and D.

  • Is the voltage between 1.5—3.5 V?

Yes

Go to Step 29.

No

Go to the next step.

28

 INSPECT INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Replace the instrument cluster because there is a short to the power supply in the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Repair or replace the wiring harness between the instrument cluster and connector C-41 because the wiring harness is shorted to the power supply.

29

 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].)

(See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

No

Repair or replace the wiring harness between the SAS control module and connector C-41 because the wiring harness is shorted to the power supply.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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