DETERMINING SHORT TO POWER SUPPLY LOCATION (HS-CAN) [MZR 1.6 (L.H.D.)]


id100232000700

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 [MZR 1.6 (L.H.D.)].)

System Wiring Diagram

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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 FOR SHORT TO POWER SUPPLY BETWEEN FRONT BODY CONTROL MODULE (FBCM) AND INSTRUMENT CLUSTER
•  Disconnect the negative battery cable.
•  Disconnect connector 2 which has front body control module (FBCM) terminals 2K and 2I
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Go to the next step.
No
Go to Step 9.
2
INSPECT CAN LINE BETWEEN PCM AND FRONT BODY CONTROL MODULE (FBCM) FOR SHORT TO POWER SUPPLY
•  Measure the voltage at PCM terminals 1BE and 1AZ.
•  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).
No
Go to the next step.
3
INSPECT CAN LINE BETWEEN CONNECTOR C-32 AND FRONT BODY CONTROL MODULE (FBCM) FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-32.
•  Connect connector 2 which has front body control module (FBCM) terminals 2K and 2I
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between connector C-32 and the front body control module (FBCM) because the wiring harness is shorted to the power supply.
4
INSPECT CAN LINE BETWEEN AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE OR ADAPTIVE LED HEADLIGHTS CONTROL MODULE AND CONNECTOR C-32 FOR SHORT TO POWER SUPPLY
•  Measure the voltage at AFS control module / auto leveling control module or adaptive LED headlights control module terminals A and B.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Go to Step 6.
No
Go to the next step.
5
INSPECT AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE OR ADAPTIVE LED HEADLIGHTS CONTROL MODULE FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the AFS control module / auto leveling control module or adaptive LED headlights control module connector.
•  Connect connector C-32.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the AFS control module / auto leveling control module or adaptive LED headlights control module because there is a short to the power supply in the AFS control module / auto leveling control module or adaptive LED headlights control module.
No
Repair or replace the wiring harness between the AFS control module / auto leveling control module or adaptive LED headlights control module and connector C-32 because the wiring harness is shorted to the power supply.
6
INSPECT CAN LINE BETWEEN CONNECTOR C-60 AND CONNECTOR C-32 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-60.
•  Connect connector C-32.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
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.
7
INSPECT CAN LINE BETWEEN DSC HU/CM OR ABS HU/CM AND CONNECTOR C-60 FOR SHORT TO POWER SUPPLY
•  Measure the voltage at DSC HU/CM terminals AF and AC (with DSC).
•  Measure the voltage at ABS HU/CM terminals H and L (without DSC).
•  Is the voltage between 1.5 — 3.5 V?
Yes
Go to Step 31.
No
Go to the next step.
8
INSPECT DSC HU/CM OR ABS HU/CM FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the DSC HU/CM or ABS HU/CM connector.
•  Connect connector C-60.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the DSC HU/CM or ABS HU/CM because there is a short to the power supply in the DSC HU/CM or ABS HU/CM.
No
Repair or replace the wiring harness between DSC HU/CM or ABS HU/CM and connector C-60 because the wiring harness is shorted to the power supply.
9
INSPECT CAN LINE BETWEEN CONNECTOR C-03 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-03.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
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.
10
INSPECT CAN LINE BETWEEN CONNECTOR C-12 AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-12.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  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.
11
INSPECT CAN LINE BETWEEN CONNECTOR C-12 AND CONNECTOR C-33 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-33.
•  Connect connector C-12.
•  Connect connector C-03.
•  Cnnect connector 2 which has front body control module (FBCM) terminals 2K and 2I
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at PCM terminals 1BE and 1AZ.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness between connector C-12 and connector C-33 because the wiring harness is shorted to the power supply.
12
INSPECT CAN LINE BETWEEN CONNECTOR C-33 AND DLC-2 FOR SHORT TO POWER SUPPLY
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage 0 V?
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.
13
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 15.
No
Go to the next step.
14
INSPECT EPS CONTROL MODULE FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Connect connector C-33.
•  Disconnect the EPS control module connector.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the EPS control module because there is a short to the power supply in the EPS control module.
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.
15
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 17.
No
Go to the next step.
16
INSPECT START STOP UNIT FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the start stop unit connector.
•  Connect connector C-33.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the start stop unit because there is a short to the power supply in the start stop unit.
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.
17
INSPECT JB No.2 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-34.
•  Connect connector C-33.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
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.
18
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 20.
No
Go to the next step.
19
INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the connectivity master unit (CMU) connector.
•  Connect connector C-34.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the connectivity master unit (CMU) because there is a short to the power supply in the connectivity master unit (CMU).
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.
20
INSPECT CAN LINE BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND CONNECTOR C-34 FOR SHORT TO POWER SUPPLY
•  Measure the voltage at MAZDA ERA-GLONASS control module terminals 1Q and 1S.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Go to Step 23.
No
Go to the next step.
21
INSPECT CAN LINE BETWEEN MAZDA ERA-GLONASS CONTROL MODULE AND CONNECTOR C-62 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off (LOCK).
•  Disconnect the negative battery cable.
•  Disconnect connector C-62.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at MAZDA ERA-GLONASS control module terminals 1Q and 1S.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Repair or replace the wiring harness between connector C-62 and connector C-34 because the wiring harness is shorted to the power supply.
No
Go to the next step.
22
INSPECT MAZDA ERA-GLONASS CONTROL MODULE FOR SHORT TO POWER SUPPLY
•  Switch the ignition off (LOCK).
•  Disconnect the negative battery cable.
•  Connect connector C-34.
•  Connect connector C-62.
•  Disconnect the MAZDA ERA-GLONASS control module connector.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals E and F.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the MAZDA ERA-GLONASS control module because there is a short to the power supply in the MAZDA ERA-GLONASS control module.
No
Repair or replace the wiring harness between the MAZDA ERA-GLONASS control module and connector C-62 because the wiring harness is shorted to the power supply.
23
INSPECT CAN LINE BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-34 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 25.
24
INSPECT SAS CONTROL MODULE FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the SAS control module connector.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at SAS control module terminals 3B and 3C (wiring harness side).
•  Is the voltage 0 V?
Yes
Replace the SAS control module connector because there is a short to the power supply in the SAS control module connector.
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.
25
INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-09.
•  Connect connector C-34.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
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.
26
INSPECT CAN LINE BETWEEN CONNECTOR C-09 AND CONNECTOR C-40 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-40.
•  Connect connector C-09.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
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.
27
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 29.
No
Go to the next step.
28
INSPECT AUDIO AMPLIFIER FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the audio amplifier connector.
•  Connect connector C-40.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the audio amplifier because there is a short to the power supply in the audio amplifier.
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.
29
INSPECT CAN LINE BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect connector C-09.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  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 the connector C-40 and connector C-09 because the wiring harness is shorted to the power supply.
No
Go to the next step.
30
INSPECT INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the instrument cluster connector.
•  Connect connector C-40.
•  Connect connector C-09.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  Is the voltage between 1.5 — 3.5 V?
Yes
Replace the instrument cluster because there is a short to the power supply in the instrument cluster.
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.
31
INSPECT PCM FOR SHORT TO POWER SUPPLY
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the PCM connector.
•  Connect connector C-60.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off).
•  Measure the voltage at DLC-2 terminals F and E.
•  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.
No
Repair or replace the wiring harness between the PCM and connector C-60 because the wiring harness is shorted to the power supply.