No.6 ISO 9141 NETWORK DOES NOT ESTABLISH COMMUNICATION[MULTIPLEX COMMUNICATION SYSTEM (AJ (3.0L Duratec))]

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STEP

INSPECTION

ACTION

1

INSPECT M-MDS FOR DAMAGE

Inspect the M-MDS for damage.

Is the M-MDS normal?

Yes

Go to the next step.

No

Replace the wiring harness. Perform the network test.

2

INSPECT DLC-2 FOR DAMAGE

Turn the ignition switch off.

Inspect the DLC-2 terminal D and the related wiring harness.

Is the DLC-2 connector and the related wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the DLC-2 and the related wiring harness. Perform the network test.

3

INSPECT FOR OPEN CIRCUIT BETWEEN DLC-2 AND GEM

Measure the resistance between GEM terminal 1U (harness-side) and DLC-2 terminal D.

Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Replace the wiring harness. Perform the network test.

4

INSPECT FOR SHORT TO GROUND AND POWER SUPPLY (WITH GEM DISCONNECTED)

Turn the ignition switch to the ON position.

Does the M-MDS indicate that the system operates normally?

Yes

Go to Step 10.

No

Go to the next step.

5

INSPECT FOR OPEN CIRCUIT BETWEEN DLC-2 AND SAS CONTROL MODULE

Measure the resistance between SAS control module terminal 2M (harness-side) and DLC-2 terminal D.

Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Replace the wiring harness. Perform the network test.

6

INSPECT FOR SHORT TO GROUND AND POWER SUPPLY (WITH SAS CONTROL MODULE DISCONNECTED)

Turn the ignition switch to the ON position.

Does the M-MDS indicate that the system operates normally?

Yes

Go to Step 11.

No

Go to the next step.

7

INSPECT FOR OPEN CIRCUIT BETWEEN DLC-2 AND ABS HU/CM

Measure the resistance between ABS HU/CM terminal F (harness-side) and DLC-2 terminal D.

Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Replace the wiring harness. Perform the network test.

8

INSPECT FOR SHORT TO GROUND AND POWER SUPPLY (WITH ABS HU/CM DISCONNECTED)

Turn the ignition switch to the ON position.

Does the M-MDS indicate that the system operates normally?

Yes

Go to Step 12.

No

Go to the next step.

9

INSPECT ABS TEST CONNECTOR FOR DAMAGE

Turn the ignition switch off.

Inspect the ABS test connector terminal H and the related wiring harness.

Is the ABS test connector normal?

Yes

Replace the wiring harness. Perform the network test.

No

Replace the wiring harness. Perform the network test.

10

INSPECT GEM OPERATION

Disconnect all the GEM connectors.

Inspection:

•  Corrosion

•  Terminal separation

Connect all the GEM connectors and verify that their positions are correct.

Operate the system and inspect for any malfunction.

Is any malfunction still present?

Yes

Replace the GEM. Perform the network test.

No

The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.

11

INSPECT SAS CONTROL MODULE OPERATION

Disconnect all SAS control module connectors.

Inspection:

•  Corrosion

•  Terminal separation

Connect all the SAS connectors and verify that their positions are correct.

Operate the system and inspect for any malfunction.

Is any malfunction still present?

Yes

Replace the SAS control module. Perform the network test.

No

The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.

12

INSPECT ABS HU/CM OPERATION

Disconnect all the ABS HU/CM connectors.

Inspection:

•  Corrosion

•  Terminal separation

Connect all the ABS HU/CM connectors and verify that their positions are correct.

Operate the system and inspect for any malfunction.

Is any malfunction still present?

Yes

Replace the ABS HU/CM.

Perform the network test.

No

The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.

STEP	INSPECTION		ACTION
1	INSPECT M-MDS FOR DAMAGE Inspect the M-MDS for damage. Is the M-MDS normal?	Yes	Go to the next step.
1		No	Replace the wiring harness. Perform the network test.
2	INSPECT DLC-2 FOR DAMAGE Turn the ignition switch off. Inspect the DLC-2 terminal D and the related wiring harness. Is the DLC-2 connector and the related wiring harness normal?	Yes	Go to the next step.
2		No	Repair or replace the DLC-2 and the related wiring harness. Perform the network test.
3	INSPECT FOR OPEN CIRCUIT BETWEEN DLC-2 AND GEM Measure the resistance between GEM terminal 1U (harness-side) and DLC-2 terminal D. Is the resistance less than 5 ohms?	Yes	Go to the next step.
3		No	Replace the wiring harness. Perform the network test.
4	INSPECT FOR SHORT TO GROUND AND POWER SUPPLY (WITH GEM DISCONNECTED) Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Go to Step 10.
4		No	Go to the next step.
5	INSPECT FOR OPEN CIRCUIT BETWEEN DLC-2 AND SAS CONTROL MODULE Measure the resistance between SAS control module terminal 2M (harness-side) and DLC-2 terminal D. Is the resistance less than 5 ohms?	Yes	Go to the next step.
5		No	Replace the wiring harness. Perform the network test.
6	INSPECT FOR SHORT TO GROUND AND POWER SUPPLY (WITH SAS CONTROL MODULE DISCONNECTED) Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Go to Step 11.
6		No	Go to the next step.
7	INSPECT FOR OPEN CIRCUIT BETWEEN DLC-2 AND ABS HU/CM Measure the resistance between ABS HU/CM terminal F (harness-side) and DLC-2 terminal D. Is the resistance less than 5 ohms?	Yes	Go to the next step.
7		No	Replace the wiring harness. Perform the network test.
8	INSPECT FOR SHORT TO GROUND AND POWER SUPPLY (WITH ABS HU/CM DISCONNECTED) Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Go to Step 12.
8		No	Go to the next step.
9	INSPECT ABS TEST CONNECTOR FOR DAMAGE Turn the ignition switch off. Inspect the ABS test connector terminal H and the related wiring harness. Is the ABS test connector normal?	Yes	Replace the wiring harness. Perform the network test.
9		No	Replace the wiring harness. Perform the network test.
10	INSPECT GEM OPERATION Disconnect all the GEM connectors. Inspection: • Corrosion • Terminal separation Connect all the GEM connectors and verify that their positions are correct. Operate the system and inspect for any malfunction. Is any malfunction still present?	Yes	Replace the GEM. Perform the network test.
10		No	The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.
11	INSPECT SAS CONTROL MODULE OPERATION Disconnect all SAS control module connectors. Inspection: • Corrosion • Terminal separation Connect all the SAS connectors and verify that their positions are correct. Operate the system and inspect for any malfunction. Is any malfunction still present?	Yes	Replace the SAS control module. Perform the network test.
11		No	The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.
12	INSPECT ABS HU/CM OPERATION Disconnect all the ABS HU/CM connectors. Inspection: • Corrosion • Terminal separation Connect all the ABS HU/CM connectors and verify that their positions are correct. Operate the system and inspect for any malfunction. Is any malfunction still present?	Yes	Replace the ABS HU/CM. Perform the network test.
12		No	The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.