No.3 GENERIC ELECTRONIC MODULE (GEM) DOES NOT RESPOND TO M-MDS[MULTIPLEX COMMUNICATION SYSTEM (AJ (3.0L Duratec))]

id0903g7819400

STEP

INSPECTION

ACTION

1

INSPECT GEM CONNECTOR FOR DAMAGE

Turn the ignition switch off.

Disconnect the GEM connector.

Inspect the GEM connector for damage.

Is the GEM connector normal?

Yes

Go to the next step.

No

Replace the wiring harness. Perform the network test.

2

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.

3

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.

STEP	INSPECTION		ACTION
1	INSPECT GEM CONNECTOR FOR DAMAGE Turn the ignition switch off. Disconnect the GEM connector. Inspect the GEM connector for damage. Is the GEM connector normal?	Yes	Go to the next step.
1		No	Replace the wiring harness. Perform the network test.
2	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.
2		No	Replace the wiring harness. Perform the network test.
3	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.
3		No	The system operates normally. The malfunction may result from loose connectors or corrosion. Clear the DTC. Repeat the self-test.