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Determination Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
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 FOR SHORT TO POWER SUPPLY BETWEEN FRONT BODY CONTROL MODULE (FBCM) AND INSTRUMENT CLUSTER Yes Go to the next step.
No Go to Step 17.
2 INSPECT CAN LINE BETWEEN PCM AND FRONT BODY CONTROL MODULE (FBCM) 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 front body control module (FBCM) because there is a short to the power supply in the front body control module (FBCM).
(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION .)
No Go to the next step.
3 INSPECT CAN LINE BETWEEN CONNECTOR C-01 AND FRONT BODY CONTROL MODULE (FBCM) FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between the front body control module (FBCM) and connector C-01 because the wiring harness is shorted to the power supply.
4 INSPECT CAN LINE BETWEEN TCM AND CONNECTOR C-01 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 6.
No Go to the next step.
5 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 [FW6A-EL] .)
No Repair or replace the wiring harness between the TCM and connector C-01 because the wiring harness is shorted to the power supply.
6 INSPECT CAN LINE BETWEEN CONNECTOR C-32 AND CONNECTOR C-01 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between connector C-32 and connector C-01 because the wiring harness is shorted to the power supply.
7 INSPECT CAN LINE BETWEEN ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE/AUTO LEVELING CONTROL MODULE AND CONNECTOR C-32 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at adaptive front lighting system (AFS) control module/auto leveling control module terminals A and B.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 9.
No Go to the next step.
8 INSPECT ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE/AUTO LEVELING CONTROL MODULE FOR SHORT TO POWER SUPPLY Yes Replace the adaptive front lighting system (AFS) control module/auto leveling control module because there is a short to the power supply in the adaptive front lighting system (AFS) control module/auto leveling control module.
(See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION .)
(See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness between the adaptive front lighting system (AFS) control module/auto leveling control module and connector C-32 because the wiring harness is shorted to the power supply.
9 INSPECT CAN LINE BETWEEN DC-DC CONVERTER (i-ELOOP) AND CONNECTOR C-32 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at DC-DC converter (i-ELOOP) terminals 1A and 1C.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 12.
No Go to the next step.
10 INSPECT CAN LINE BETWEEN DC-DC CONVERTER (i-ELOOP) AND CONNECTOR C-05 FOR SHORT TO POWER SUPPLY Yes Repair or replace the wiring harness between connector C-32 and connector C-05 because the wiring harness is shorted to the power supply.
No Go to the next step.
11 INSPECT DC-DC CONVERTER (i-ELOOP) FOR SHORT TO POWER SUPPLY Yes Replace the DC-DC converter (i-ELOOP) because there is a short to the power supply in the DC-DC converter (i-ELOOP).
(See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP] .)
No Repair or replace the wiring harness between the DC-DC converter (i-ELOOP) and connector C-05 because the wiring harness is shorted to the power supply.
12 INSPECT CAN LINE BETWEEN CONNECTOR C-60 AND CONNECTOR C-32 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between connector C-60 and connector C-32 because the wiring harness is shorted to the power supply.
13 INSPECT CAN LINE BETWEEN DSC HU/CM AND CONNECTOR C-60 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at DSC HU/CM terminals AF and AC.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 15.
No Go to the next step.
14 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 Repair or replace the wiring harness between DSC HU/CM and connector C-60 because the wiring harness is shorted to the power supply.
15 INSPECT CAN LINE BETWEEN RADAR UNIT AND CONNECTOR C-60 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at radar unit terminals D and C.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 43.
No Go to the next step.
16 INSPECT RADAR UNIT FOR SHORT TO POWER SUPPLY Yes Replace the radar unit because there is a short to the power supply in the radar unit.
(See RADAR UNIT REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness between radar unit and connector C-60 because the wiring harness is shorted to the power supply.
17 INSPECT CAN LINE BETWEEN CONNECTOR C-03 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY Yes Repair or replace the wiring harness between connector C-03 and front body control module (FBCM) because the wiring harness is shorted to the power supply.
No Go to the next step.
18 INSPECT CAN LINE BETWEEN CONNECTOR C-12 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Go to Step 21.
19 INSPECT CAN LINE BETWEEN CONNECTOR C-12 AND FORWARD SENSING CAMERA (FSC) FOR SHORT TO POWER SUPPLY
  • Measure the voltage at the forward sensing camera (FSC) terminals M and N.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Repair or replace the wiring harness between connector C-03 and connector C-12 because the wiring harness is shorted to the power supply.
No Go to the next step.
20 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-12 because the wiring harness is shorted to the power supply.
21 INSPECT CAN LINE BETWEEN CONNECTOR C-33 AND DLC-2 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between connector C-33 and DLC-2 because the wiring harness is shorted to the power supply.
22 INSPECT CAN LINE BETWEEN EPS CONTROL MODULE AND CONNECTOR C-33 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at EPS control module terminals 2B and 2D.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 24.
No Go to the next step.
23 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 Repair or replace the wiring harness between the EPS control module and connector C-33 because the wiring harness is shorted to the power supply.
24 INSPECT CAN LINE BETWEEN START STOP UNIT AND CONNECTOR C-33 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 26.
No Go to the next step.
25 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-33 because the wiring harness is shorted to the power supply.
26 INSPECT CAN LINE BETWEEN CONNECTOR C-33 AND INSTRUMENT CLUSTER 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 Repair or replace the wiring harness between connector C-12 and connector C-33 because the wiring harness is shorted to the power supply.
No Go to the next step.
27 INSPECT JB No. 2 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Replace the JB No. 2 because there is a short to the power supply in the JB No. 2.
28 INSPECT CAN LINE BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND CONNECTOR C-34 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 30.
No Go to the next step.
29 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-34 because the wiring harness is shorted to the power supply.
30 INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND INSTRUMENT CLUSTER 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 the next step.
No Go to Step 32.
31 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 SAS control module and connector C-34 because the wiring harness is shorted to the power supply.
32 INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between connector C-34 and connector C-09 because the wiring harness is shorted to the power supply.
33 INSPECT CAN LINE BETWEEN CONNECTOR C-09 AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between connector C-09 and connector C-40 because the wiring harness is shorted to the power supply.
34 INSPECT CAN LINE BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-40 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 36.
No Go to the next step.
35 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-40 because the wiring harness is shorted to the power supply.
36 INSPECT CAN LINE BETWEEN ELECTRIC PARKING BRAKE CONTROL MODULE AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at electric parking brake control module terminals AD and AB.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 38.
No Go to the next step.
37 INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE FOR SHORT TO POWER SUPPLY Yes Replace the electric parking brake control module because there is a short to the power supply in the electric parking brake control module.
(See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness between the electric parking brake control module and connector C-40 because the wiring harness is shorted to the power supply.
38 INSPECT CAN LINE BETWEEN OCCUPANT CLASSIFICATION SENSOR AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
  • Measure the voltage at occupant classification sensor terminals 3D and 3C.
  • Is the voltage between 1.5 - 3.5 V?
 Yes Go to Step 41.
No Go to the next step.
39 INSPECT CAN LINE BETWEEN CONNECTOR C-40 AND CONNECTOR C-26 FOR SHORT TO POWER SUPPLY Yes Go to the next step.
No Repair or replace the wiring harness between connector C-40 and connector C-26 because the wiring harness is shorted to the power supply.
40 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-26 because the wiring harness is shorted to the power supply.
41 INSPECT CAN LINE BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY Yes Repair or replace the wiring harness between the connector C-40 and connector C-09 because the wiring harness is shorted to the power supply.
No Go to the next step.
42 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-09 because the wiring harness is shorted to the power supply.
43 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, SKYACTIV-G 2.5] .)
No Repair or replace the wiring harness between the PCM and connector C-60 because the wiring harness is shorted to the power supply.
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