No.7 SCP NETWORK DOES NOT ESTABLISH COMMUNICATION[MULTIPLEX COMMUNICATION SYSTEM (AJ (3.0L Duratec))]

id0903g7819800

STEP

INSPECTION

ACTION

1

INSPECT M-MDS CONNECTOR FOR DAMAGE

Inspect the M-MDS connector 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 and the related wiring harness.

Are the DLC-2 and the 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 SHORT TO B+ AND GROUND (WITH INSTRUMENT CLUSTER DISCONNECTED)

Turn the ignition switch off.

Disconnect the instrument cluster connector.

Turn the ignition switch to the ON position.

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

Yes

Go to Step 7.

No

Go to the next step.

4

INSPECT FOR SHORT TO B+ AND GROUND (WITH PCM DISCONNECTED)

Turn the ignition switch off.

Connect the instrument cluster connector.

Disconnect the PCM connector.

Turn the ignition switch to the ON position.

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

Yes

Go to Step 8.

No

Go to the next step.

5

INSPECT FOR SHORT TO B+ AND GROUND (WITH INTERMEDIATE CONNECTOR DISCONNECTED)

Turn the ignition switch off.

Connect the PCM connector.

Disconnect the C-05 connector.

Turn the ignition switch to the ON position.

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

Yes

Repair or replace the connector or the related wiring harness. Perform the network test.

No

Go to the next step.

6

INSPECT FOR SHORT TO B+ AND GROUND (WITH INTERMEDIATE CONNECTOR DISCONNECTED)

Turn the ignition switch off.

Connect the C-05 connector.

Disconnect the C-03 connector.

Turn the ignition switch to the ON position.

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

Yes

Replace the wiring harness between connectors C-05 and C-03. Perform the network test.

No

Repair or replace the wiring harness between connectors C-05, C-03, instrument cluster, and DLC-2. Perform the network test.

7

INSPECT INSTRUMENT CLUSTER OPERATION

Disconnect all the instrument cluster connectors.

Inspection:

•  Corrosion

•  Terminal separation

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

Operate the system and inspect for any malfunction.

Is any malfunction still present?

Yes

Replace the instrument cluster.

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.

8

INSPECT PCM OPERATION

Disconnect all the PCM connectors.

Inspection:

•  Corrosion

•  Terminal separation

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

Operate the system and inspect for any malfunction.

Is any malfunction still present?

Yes

Replace the PCM.

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 CONNECTOR FOR DAMAGE Inspect the M-MDS connector 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 and the related wiring harness. Are the DLC-2 and the 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 SHORT TO B+ AND GROUND (WITH INSTRUMENT CLUSTER DISCONNECTED) Turn the ignition switch off. Disconnect the instrument cluster connector. Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Go to Step 7.
3		No	Go to the next step.
4	INSPECT FOR SHORT TO B+ AND GROUND (WITH PCM DISCONNECTED) Turn the ignition switch off. Connect the instrument cluster connector. Disconnect the PCM connector. Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Go to Step 8.
4		No	Go to the next step.
5	INSPECT FOR SHORT TO B+ AND GROUND (WITH INTERMEDIATE CONNECTOR DISCONNECTED) Turn the ignition switch off. Connect the PCM connector. Disconnect the C-05 connector. Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Repair or replace the connector or the related wiring harness. Perform the network test.
5		No	Go to the next step.
6	INSPECT FOR SHORT TO B+ AND GROUND (WITH INTERMEDIATE CONNECTOR DISCONNECTED) Turn the ignition switch off. Connect the C-05 connector. Disconnect the C-03 connector. Turn the ignition switch to the ON position. Does the M-MDS indicate that the system operates normally?	Yes	Replace the wiring harness between connectors C-05 and C-03. Perform the network test.
6		No	Repair or replace the wiring harness between connectors C-05, C-03, instrument cluster, and DLC-2. Perform the network test.
7	INSPECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Inspection: • Corrosion • Terminal separation Connect all the instrument cluster connectors and verify that their positions are correct. Operate the system and inspect for any malfunction. Is any malfunction still present?	Yes	Replace the instrument cluster. Perform the network test.
7		No	The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.
8	INSPECT PCM OPERATION Disconnect all the PCM connectors. Inspection: • Corrosion • Terminal separation Connect all the PCM connectors and verify that their positions are correct. Operate the system and inspect for any malfunction. Is any malfunction still present?	Yes	Replace the PCM.
8		No	The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.