DETERMINING SHORT TO GROUND LOCATION (HS-CAN)

< Previous Next >

2014 - Mazda6 - Multiplex Communication System

DETERMINING SHORT TO GROUND LOCATION (HS-CAN)

CAUTION:

Perform the following malfunction diagnosis only when it is diagnosed with a short to ground by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.

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.


Step	Inspection		Action
1	INSPECT FOR SHORT TO GROUND BETWEEN FRONT BODY CONTROL MODULE (FBCM) AND INSTRUMENT CLUSTER Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].) Disconnect connector 2 which has front body control module (FBCM) terminals 2P and 2N. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Go to Step 5.
1		No	Go to the next step.
2	INSPECT CAN LINE IN FRONT BODY CONTROL MODULE (FBCM) FOR SHORT TO GROUND Inspect for continuity at the following terminals: Between front body control module (FBCM) terminal 2P and body ground Between front body control module (FBCM) terminal 2N and body ground Is there continuity?	Yes	Replace the front body control module (FBCM) because there is a short to ground in the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
2		No	Go to the next step.
3	INSPECT FOR SHORT TO GROUND BETWEEN AFS CONTROL MODULE AND FRONT BODY CONTROL MODULE (FBCM) Inspect for continuity at the following terminals: Between AFS control module terminal AB and body ground Between AFS control module terminal AD and body ground Is there continuity?	Yes	Go to the next step.
3		No	Go to Step 35.
4	INSPECT CAN LINE IN AFS CONTROL MODULE FOR SHORT TO GROUND Disconnect the AFS control module connector. Inspect for continuity at the following terminals: Between AFS control module terminal AB (wiring harness side) and body ground Between AFS control module terminal AD (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the AFS control module and front body control module (FBCM) because the wiring harness is shorted to ground.
4		No	Replace the AFS control module because there is a short to ground in the AFS control module. (See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION.)
5	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-04 AND INSTRUMENT CLUSTER Disconnect connector C-04. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness between the front body control module (FBCM) and connector C-04 because the wiring harness is shorted to ground.
6	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-49 AND C-50 AND INSTRUMENT CLUSTER Disconnect connectors C-49 and C-50. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Go to Step 11.
6		No	Go to the next step.
7	INSPECT FOR SHORT TO GROUND BETWEEN VEHICLE CONTROL MODULE (V/C-MODULE) / DC-DC CONVERTER (i-ELOOP) AND CONNECTORS C-49 AND C-50 Inspect for continuity at the following terminals: Between vehicle control module (V/C-module) terminal S and body ground (with smart brake support) Between vehicle control module (V/C-module) terminal U and body ground (with smart brake support) Between DC-DC converter (i-ELOOP) terminal 1A and body ground (with i-ELOOP system) Between DC-DC converter (i-ELOOP) terminal 1C and body ground (with i-ELOOP system) Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness between connector C-04 and connectors C-49 and C-50 because the wiring harness is shorted to ground.
8	INSPECT FOR SHORT TO GROUND BETWEEN VEHICLE CONTROL MODULE (V/C-MODULE) AND CONNECTORS C-49 AND C-50 Inspect for continuity at the following terminals: Between vehicle control module (V/C-module) terminal S and body ground Between vehicle control module (V/C-module) terminal U and body ground Is there continuity?	Yes	Go to the next step.
8		No	Go to Step 10.
9	INSPECT CAN LINE IN VEHICLE CONTROL MODULE (V/C-MODULE) FOR SHORT TO GROUND Disconnect the vehicle control module (V/C-module) connector. Inspect for continuity at the following terminals: Between vehicle control module (V/C-module) terminal S (wiring harness side) and body ground Between vehicle control module (V/C-module) terminal U (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between vehicle control module (V/C-module) and connectors C-49 and C-50 because the wiring harness is shorted to ground.
9		No	Replace the vehicle control module (V/C-module) because there is a short to ground in the vehicle control module (V/C-module). (See VEHICLE CONTROL MODULE (V/C-MODULE) INSPECTION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM].)
10	INSPECT CAN LINE IN DC-DC CONVERTER (i-ELOOP) FOR SHORT TO GROUND Disconnect the DC-DC converter (i-ELOOP) connector. Inspect for continuity at the following terminals: Between DC-DC converter (i-ELOOP) terminal 1A (wiring harness side) and body ground Between DC-DC converter (i-ELOOP) terminal 1C (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the DC-DC converter (i-ELOOP) and connectors C-49 and C-50 because the wiring harness is shorted to ground.
10		No	Replace the DC-DC converter (i-ELOOP) because there is a short to ground in the DC-DC converter (i-ELOOP). (See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP].)
11	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-51 AND C-52 AND INSTRUMENT CLUSTER Disconnect connectors C-51 and C-52. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Go to Step 15.
11		No	Go to the next step.
12	INSPECT FOR SHORT TO GROUND BETWEEN POSITION MEMORY CONTROL MODULE AND CONNECTORS C-51 AND C-52 Inspect for continuity at the following terminals: Between position memory control module terminal 1C and body ground Between position memory control module terminal 1E and body ground Is there continuity?	Yes	Go to the next step.
12		No	Repair or replace the wiring harness between connectors C-49 and C-50 and connectors C-51 and C-52 because the wiring harness is shorted to ground.
13	INSPECT FOR SHORT TO GROUND BETWEEN POSITION MEMORY CONTROL MODULE AND CONNECTOR C-55 Disconnect connector C-55. Inspect for continuity at the following terminals: Between position memory control module terminal 1C and body ground Between position memory control module terminal 1E and body ground Is there continuity?	Yes	Go to the next step.
13		No	Repair or replace the wiring harness between connector C-55 and connectors C-51 and C-52 because the wiring harness is shorted to ground.
14	INSPECT CAN LINE IN POSITION MEMORY CONTROL MODULE FOR SHORT TO GROUND Disconnect the position memory control module connector. Inspect for continuity at the following terminals: Between position memory control module terminal 1C (wiring harness side) and body ground Between position memory control module terminal 1E (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the position memory control module and connector C-55 because the wiring harness is shorted to ground.
14		No	Replace the position memory control module because there is a short to ground in the position memory control module. (See FRONT SEAT REMOVAL/INSTALLATION.)
15	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-10 AND INSTRUMENT CLUSTER Disconnect connector C-10. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Go to the next step.
15		No	Repair or replace the wiring harness between connectors C-51 and C-52 and connector C-10 because the wiring harness is shorted to ground.
16	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-11 AND INSTRUMENT CLUSTER Disconnect connector C-11. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Go to Step 23.
16		No	Go to the next step.
17	INSPECT FOR SHORT TO GROUND BETWEEN LASER SENSOR / FORWARD SENSING CAMERA AND CONNECTOR C-11 Inspect for continuity at the following terminals: Between laser sensor terminal D and body ground (with smart city brake support) Between laser sensor terminal C and body ground (with smart city brake support) Between forward sensing camera terminal E and body ground (with forward sensing camera) Between forward sensing camera terminal C and body ground (with forward sensing camera) Is there continuity?	Yes	Go to the next step.
17		No	Repair or replace the wiring harness between connector C-10 and connector C-11 because the wiring harness is shorted to ground.
18	INSPECT FOR SHORT TO GROUND BETWEEN LASER SENSOR AND CONNECTOR C-42 Disconnect connector C-42. Inspect for continuity at the following terminals: Between laser sensor terminal D and body ground Between laser sensor terminal C and body ground Is there continuity?	Yes	Go to the next step.
18		No	Go to Step 20.
19	INSPECT CAN LINE IN LASER SENSOR FOR SHORT TO GROUND Disconnect the laser sensor connector. Inspect for continuity at the following terminals: Between laser sensor terminal D (wiring harness side) and body ground Between laser sensor terminal C (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the laser sensor and connector C-42 because the wiring harness is shorted to ground.
19		No	Replace the laser sensor because there is a short to ground in the laser sensor. (See LASER SENSOR REMOVAL/INSTALLATION.)
20	INSPECT FOR SHORT TO GROUND BETWEEN FORWARD SENSING CAMERA AND CONNECTOR C-42 Inspect for continuity at the following terminals: Between forward sensing camera terminal E and body ground Between forward sensing camera terminal C and body ground Is there continuity?	Yes	Go to the next step.
20		No	Repair or replace the wiring harness between connector C-11 and connector C-42 because the wiring harness is shorted to ground.
21	INSPECT FOR SHORT TO GROUND BETWEEN FORWARD SENSING CAMERA AND CONNECTOR C-27 Disconnect connector C-27. Inspect for continuity at the following terminals: Between forward sensing camera terminal E and body ground Between forward sensing camera terminal C and body ground Is there continuity?	Yes	Go to the next step.
21		No	Repair or replace the wiring harness between connector C-42 and connector C-27 because the wiring harness is shorted to ground.
22	INSPECT CAN LINE IN FORWARD SENSING CAMERA FOR SHORT TO GROUND Disconnect the forward sensing camera connector. Inspect for continuity at the following terminals: Between forward sensing camera terminal E (wiring harness side) and body ground Between forward sensing camera terminal C (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the forward sensing camera and connector C-27 because the wiring harness is shorted to ground.
22		No	Replace the forward sensing camera because there is a short to ground in the forward sensing camera. (See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION.)
23	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-34 AND DLC-2 Disconnect connector C-34. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-34 and DLC-2 because the wiring harness is shorted to ground.
23		No	Go to the next step.
24	INSPECT FOR SHORT TO GROUND BETWEEN EPS CONTROL MODULE AND CONNECTOR C-34 Inspect for continuity at the following terminals: Between EPS control module terminal 2A and body ground Between EPS control module terminal 2D and body ground Is there continuity?	Yes	Go to the next step.
24		No	Go to Step 26.
25	INSPECT CAN LINE IN EPS CONTROL MODULE FOR SHORT TO GROUND Disconnect the EPS control module connector. Inspect for continuity at the following terminals: Between EPS control module terminal 2A (wiring harness side) and body ground Between EPS control module terminal 2D (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the EPS control module and connector C-34 because the wiring harness is shorted to ground.
25		No	Replace the EPS control module because there is a short to ground in the EPS control module. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
26	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-11 AND CONNECTOR C-34 Inspect for continuity at the following terminals: Between instrument cluster terminal B and body ground Between instrument cluster terminal D and body ground Is there continuity?	Yes	Go to the next step.
26		No	Repair or replace the wiring harness between connector C-11 and connector C-34 because the wiring harness is shorted to ground.
27	INSPECT FOR SHORT TO GROUND BETWEEN START STOP UNIT AND CONNECTOR C-35 Disconnect connector C-35. Inspect for continuity at the following terminals: Between start stop unit terminal 2M and body ground Between start stop unit terminal 2O and body ground Is there continuity?	Yes	Go to the next step.
27		No	Go to Step 29.
28	INSPECT CAN LINE IN START STOP UNIT FOR SHORT TO GROUND Disconnect the start stop unit connector. Inspect for continuity at the following terminals: Between start stop unit terminal 2M (wiring harness side) and body ground Between start stop unit terminal 2O (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the start stop unit and connector C-35 because the wiring harness is shorted to ground.
28		No	Replace the start stop unit because there is a short to ground in the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.)
29	INSPECT FOR SHORT TO GROUND BETWEEN SAS CONTROL MODULE AND CONNECTOR C-35 Inspect for continuity at the following terminals: Between SAS control module terminal 3K and body ground Between SAS control module terminal 3L and body ground Is there continuity?	Yes	Go to the next step.
29		No	Go to Step 31.
30	INSPECT CAN LINE IN SAS CONTROL MODULE FOR SHORT TO GROUND Disconnect the SAS control module connector. Inspect for continuity at the following terminals: Between SAS control module terminal 3K (wiring harness side) and body ground Between SAS control module terminal 3L (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the SAS control module and connector C-35 because the wiring harness is shorted to ground.
30		No	Replace the SAS control module because there is a short to ground in the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)
31	INSPECT FOR SHORT TO GROUND BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-35 Inspect for continuity at the following terminals: Between audio amplifier terminal 2L and body ground Between audio amplifier terminal 2N and body ground Is there continuity?	Yes	Go to the next step.
31		No	Go to Step 33.
32	INSPECT CAN LINE IN AUDIO AMPLIFIER FOR SHORT TO GROUND Disconnect the audio amplifier connector. Inspect for continuity at the following terminals: Between audio amplifier terminal 2L (wiring harness side) and body ground Between audio amplifier terminal 2N (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the audio amplifier and connector C-35 because the wiring harness is shorted to ground.
32		No	Replace the audio amplifier because there is a short to ground in the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
33	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-35 AND INSTRUMENT CLUSTER Inspect for continuity at the following terminals: Between instrument cluster terminal B and body ground Between instrument cluster terminal D and body ground Is there continuity?	Yes	Go to the next step.
33		No	Repair or replace the wiring harness between connector C-34 and connector C-35 because the wiring harness is shorted to ground.
34	INSPECT CAN LINE IN INSTRUMENT CLUSTER FOR SHORT TO GROUND Disconnect the instrument cluster connector. Inspect for continuity at the following terminals: Between instrument cluster terminal B (wiring harness side) and body ground Between instrument cluster terminal D (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the instrument cluster and connector C-35 because the wiring harness is shorted to ground.
34		No	Replace the instrument cluster because there is a short to ground in the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
35	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-01 AND FRONT BODY CONTROL MODULE (FBCM) Disconnect connector C-01. Connect connector 2 which has front body control module (FBCM) terminals 2P and 2N. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-01 and the front body control module (FBCM) because the wiring harness is shorted to ground.
35		No	Go to the next step.
36	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTOR C-01 AND TCM Inspect for continuity at the following terminals: Between TCM terminal E and body ground Between TCM terminal F and body ground Is there continuity?	Yes	Go to the next step.
36		No	Go to Step 38.
37	INSPECT CAN LINE IN TCM FOR SHORT TO GROUND Disconnect the TCM connector. Inspect for continuity at the following terminals: Between TCM terminal E (wiring harness side) and body ground Between TCM terminal F (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the TCM and connector C-01 because the wiring harness is shorted to ground.
37		No	Replace the TCM because there is a short to ground in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL].)
38	INSPECT FOR SHORT TO GROUND BETWEEN CONNECTORS C-32 AND C-01 Disconnect connector C-32. Connect connector C-01. Inspect for continuity at the following terminals: Between DLC-2 terminal F and body ground Between DLC-2 terminal E and body ground Is there continuity?	Yes	Repair or replace the wiring harness between connector C-32 and connector C-01 because the wiring harness is shorted to ground.
38		No	Go to the next step.
39	INSPECT FOR SHORT TO GROUND BETWEEN DSC HU/CM AND CONNECTOR C-32 Inspect for continuity at the following terminals: Between DSC HU/CM terminal E and body ground Between DSC HU/CM terminal D and body ground Is there continuity?	Yes	Go to the next step.
39		No	Go to Step 41.
40	INSPECT CAN LINE IN DSC HU/CM FOR SHORT TO GROUND Disconnect the DSC HU/CM connector. Inspect for continuity at the following terminals: Between DSC HU/CM terminal E (wiring harness side) and body ground Between DSC HU/CM terminal D (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the DSC HU/CM and connector C-32 because the wiring harness is shorted to ground.
40		No	Replace the DSC HU/CM because there is a short to ground in the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION.)
41	INSPECT CAN LINE IN PCM FOR SHORT TO GROUND Disconnect the PCM connector. Inspect for continuity at the following terminals: Between PCM terminal 2AK (wiring harness side) and body ground Between PCM terminal 2AL (wiring harness side) and body ground Is there continuity?	Yes	Repair or replace the wiring harness between the PCM and connector C-32 because the wiring harness is shorted to ground.
41		No	Replace the PCM because there is a short to ground in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

< Previous Next >