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Home >> Lincoln >> 2008 >> Town Car V8-4.6L Flex Fuel >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Module Communications Network >> Inspection and Verification

Inspection and Verification

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
- Battery junction box (BJB) fuse(s):
- 3 (10A) (no communication with PCM)
- 13 (10A) (no communication with vehicle dynamics module [VDM])
- 20 (15A) (no communication with PCM)
- 106 (40A) (no communication with ABS module)
- 109 (20A) (no communication with ABS module)

- Central junction box (CJB) fuse(s):
- 2 (10A) (no communication with restraints control module [RCM])
- 8 (10A) (no communication with IC, LTM)
- 13 (10A) (no communication with IC, parking aid module [PAM], VDM, ABS module)
- 15 (10A) (no communication with HVAC module)
- 16 (20A) (no power to scan tool)
- 19 (7.5A) (no communication with driver door module [DDM], driver seat module [DSM], LTM)
- 23 (10A) (no communication with lighting control module [LCM])
- 25 (10A) (no communication with HVAC module, IC)
- 32 (7.5A) (no communication with rear audio and temperature control (RATC) module)

- Data link connector (DLC)
- Wiring harness
- Wiring, terminals or connectors.

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the DLC.

NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- GO to Pinpoint Test P, to diagnose no power to the scan tool. Test P: No Power To The Scan Tool

5. NOTE: During the network test, the scan tool will first attempt to communicate with the PCM, after establishing communication with the PCM, the scan tool will then attempt to communicate with all other modules on the vehicle.

Carry out the network test.
- If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
- If the network test fails, GO to Symptom Chart to identify the module not communicating. Symptom Related Diagnostic Procedures

6. If the DTCs retrieved are related to the concern, go to DTC Charts. For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). Module Communications Network
7. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures
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