Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2009 >> Expedition 4WD V8-5.4L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test U: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Pinpoint Test U: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo




Communications Network

Pinpoint Tests

Pinpoint Test U: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Responding During Network Test

Normal Operation

The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable. Circuits VDB06 (GY/OG) and VDB07 (VT/OG) provide the network connection to all modules on the network.

In the event that one of the 2 network circuits (MS-CAN + or MS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors



PINPOINT TEST U: INTERMITTENT NO MS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test. Inspection and Verification

NOTE: Various network DTCs will set while disabling modules in this test procedure which will need to be cleared after the diagnostic procedure is completed.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

-------------------------------------------------
U1 CHECK THE DLC PINS FOR DAMAGE


- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC pins 3 and 11 for damage.




- Are DLC pins 3 and 11 OK?

Yes
GO to U2.

No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.

-------------------------------------------------
U2 CHECK THE MS-CAN TERMINATION RESISTANCE


- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.




- Is the resistance between 54 and 66 ohms?

Yes
GO to U3.

No
CONNECT the negative battery cable. Go To Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

-------------------------------------------------
U3 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND


- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.




- Are the resistances greater than 1,000 ohms?

Yes
CONNECT the negative battery cable. GO to U4.

No
CONNECT the negative battery cable. Go To Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

-------------------------------------------------
U4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition ON.
- Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.




- Is the voltage greater than 6 volts?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
GO to U5.

-------------------------------------------------
U5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED


- Disconnect: SJB Fuses 15 (10A) and 37 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuses. Go To Pinpoint Test I. Pinpoint Test I: The HVAC Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to U6.

-------------------------------------------------
U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM DISABLED


- Disconnect: SJB Fuse 39 (20A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuse. Go To Pinpoint Test K. Pinpoint Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to U7.

-------------------------------------------------
U7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED


- Disconnect: SJB Fuse 5 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuse. Go To Pinpoint Test H. Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to U8.

-------------------------------------------------
U8 VERIFY VEHICLE EQUIPMENT - DSM


- Inspect the vehicle for a DSM.
- Is the vehicle equipped with a DSM?

Yes
GO to U9.

No
GO to U10.

-------------------------------------------------
U9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED


- Disconnect: SJB Fuse 2 (15A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuses. Go To Pinpoint Test P. Pinpoint Test P: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to U10.

-------------------------------------------------
U10 VERIFY VEHICLE EQUIPMENT - LTM


- Inspect the vehicle for a Liftgate/Trunk Module (LTM).
- Is the vehicle equipped with a LTM?

Yes
GO to U11.

No
GO to U12.

-------------------------------------------------
U11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE LTM DISABLED


- Disconnect: BJB Fuse 36 (30A) and SJB Fuse 14 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuses. Go To Pinpoint Test J. Pinpoint Test J: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to U12.

-------------------------------------------------
U12 VERIFY VEHICLE EQUIPMENT - AUDIO RCU, RETM AND SDARS MODULE


- Inspect the vehicle for an audio Rear Control Unit (RCU) , a Rear Entertainment Module (RETM) and/or Satellite Digital Audio Receiver System (SDARS) module.
- Is the vehicle equipped with any of the following: an audio RCU, an RETM, and/or a SDARS module?

Yes
GO to U13.

No
GO to U16.

-------------------------------------------------
U13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO RCU, RETM AND SDARS MODULE DISABLED


- Disconnect: SJB Fuse 3 (15A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuse. GO to U14.

No
INSTALL the removed fuse. GO to U16.

-------------------------------------------------
U14 VERIFY VEHICLE EQUIPMENT - SDARS MODULE


- Inspect the vehicle for a SDARS module.
- Is the vehicle equipped with a SDARS module?

Yes
GO to U15.

No
For RETM equipped vehicles, Go To Pinpoint Test O. Pinpoint Test O: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

For audio RCU equipped vehicles, Go To Pinpoint Test N. Pinpoint Test N: The Audio Rear Control Unit (RCU) Does Not Respond To The Scan Tool

-------------------------------------------------
U15 CHECK FOR RESTORED NETWORK COMMUNICATION


- Disconnect: SDARS Module C3290.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
Go To Pinpoint Test M. Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

No
For RETM equipped vehicles, Go To Pinpoint Test O. Pinpoint Test O: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

For audio RCU equipped vehicles, Go To Pinpoint Test N. Pinpoint Test N: The Audio Rear Control Unit (RCU) Does Not Respond To The Scan Tool

-------------------------------------------------
U16 VERIFY VEHICLE EQUIPMENT - AUDIO DSP MODULE


- Inspect the vehicle for an audio Digital Signal Processing (DSP) module.
- Is the vehicle equipped with an audio DSP module?

Yes
GO to U17.

No
GO to U18.

-------------------------------------------------
U17 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO DSP MODULE DISABLED


- Disconnect: SJB Fuse 38 (20A) and 40 (20A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuses. Go To Pinpoint Test L. Pinpoint Test L: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to U18.

-------------------------------------------------
U18 VERIFY VEHICLE EQUIPMENT - DCSM


- Inspect the vehicle for a Dual Climate Controlled Seat Module (DCSM).
- Is the vehicle equipped with a DCSM?

Yes
GO to U19.

No
GO to U20.

-------------------------------------------------
U19 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DCSM DISABLED


- Disconnect: BJB Fuse 67 (40A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuse. Go To Pinpoint Test Q. Pinpoint Test Q: The Dual Climate Controlled Seat Module (DCSM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to U20.

-------------------------------------------------
U20 VERIFY VEHICLE EQUIPMENT - PRB MODULE


- Inspect the vehicle for a Power Running Board (PRB) module.
- Is the vehicle equipped with a PRB module?

Yes
GO to U21.

No
GO to U22.

-------------------------------------------------
U21 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PRB MODULE DISABLED


- Disconnect: BJB Fuse 11 (40A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuse. Go To Pinpoint Test R. Pinpoint Test R: The Power Running Board (PRB) Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to U22.

-------------------------------------------------
U22 VERIFY VEHICLE EQUIPMENT - PAM


- Inspect the vehicle for a Parking Aid Module (PAM).
- Is the vehicle equipped with a PAM?

Yes
GO to U23.

No
GO to U24.

-------------------------------------------------
U23 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED


- Disconnect: SJB Fuse 35 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuse. Go To Pinpoint Test S. Pinpoint Test S: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to U24.

-------------------------------------------------
U24 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED


- Disconnect: APIM C3342.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
CONNECT the APIM. Go To Pinpoint Test T. Pinpoint Test T: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

No
CONNECT the APIM. GO to U25.

-------------------------------------------------
U25 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED


- Disconnect: SJB Fuse 26 (10A) and 29 (5A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Do all other modules pass the network test?

Yes
INSTALL the removed fuses. Go To Pinpoint Test C. Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. An intermittent fault is not present. Go To Pinpoint Test V. Pinpoint Test V: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

-------------------------------------------------
pro multis · About Operation CHARM