Pinpoint Test J: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, Communication Can Be Intermittent
Communications Network
Pinpoint Tests
Pinpoint Test J: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, Communication Can Be Intermittently Established
Normal Operation
The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG). 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 J: INTERMITTENT NO MS-CAN COMMUNICATION, COMMUNICATION CAN BE INTERMITTENTLY
ESTABLISHED
NOTE: Various modules will set network DTCs during this test procedure. Clear DTCs from all modules after the diagnostic procedure is completed.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
-------------------------------------------------
J1 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 J2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------
J2 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 J3.
No
CONNECT the negative battery cable. Go To Pinpoint Test I. Pinpoint Test I: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
-------------------------------------------------
J3 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 J4.
No
CONNECT the negative battery cable. Go To Pinpoint Test I. Pinpoint Test I: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
-------------------------------------------------
J4 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 on either circuit?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
For stripped chassis, GO to J7.
Otherwise, GO to J5.
-------------------------------------------------
J5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM OR IN-DASH COMPUTER DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.
- Disconnect: For ACM, SJB Fuse 39 (20A) and 41 (15A) (Without Navigation).
- Disconnect: For In-Dash Computer, SJB Fuse 28 (5A) and 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 fuses. For ACM, Go To Pinpoint Test G. For in-dash computer, GO to J9. Pinpoint Test G: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
No
If the vehicle is equipped with a Parking Aid Module (PAM), INSTALL the removed fuse. GO to J6.
If the vehicle is not equipped with a PAM, INSTALL the removed fuse. GO to J7.
-------------------------------------------------
J6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE PAM DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.
- 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 H. Pinpoint Test H: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to J7.
-------------------------------------------------
J7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.
- 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 F. Pinpoint Test F: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to J8.
-------------------------------------------------
J8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED
NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results.
- Disconnect: SJB Fuses 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 fuse. An intermittent fault is not present. Go To Pinpoint Test I. Pinpoint Test I: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding
-------------------------------------------------
J9 CHECK FOR CORRECT IN-DASH COMPUTER OPERATION
- Disconnect all of the in-dash computer connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all of the in-dash computer connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new in-dash computer. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
-------------------------------------------------