Pinpoint Test O: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently
Communications Network
Pinpoint Test O: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, Communication Can Be Intermittently Established
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable. In the event that 1 of the 2 network circuits (HS-CAN (High Speed Controller Area Network) + or HS-CAN (High Speed Controller Area Network) -) 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 O : INTERMITTENT NO HS-CAN (High Speed Controller Area Network) COMMUNICATION, COMMUNICATION CAN (Controller Area Network) 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.
O1 CHECK THE DLC (Data Link Connector) PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC (Data Link Connector) pins 6 and 14 for damage.
Are DLC (Data Link Connector) pins 6 and 14 OK?
Yes
GO to O2.
No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
O2 CHECK THE HS-CAN (High Speed Controller Area Network) TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side.
Is the resistance between 54 and 66 ohms?
Yes
GO to O3.
No
CONNECT the negative battery cable. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
O3 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side and ground.
Are the resistances greater than 1,000 ohms?
Yes
CONNECT the negative battery cable. GO to O4.
No
CONNECT the negative battery cable. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
O4 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side and ground.
Is the voltage on either circuit greater than 6 volts?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to O5.
O5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED
NOTE: An IDS (Integrated Diagnostic System) session must be established prior to disabling the PCM in this test step. If the PCM has failed communication during multiple attempts to identify the vehicle, first identify the vehicle manually by entering a PCM part number, calibration number or tear tag when prompted by IDS (Integrated Diagnostic System).
NOTE: When a vehicle is manually identified by a PCM part number, calibration number or tear tag, the IDS (Integrated Diagnostic System) will not automatically run a network test. The network test must be manually selected and run.
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: Battery Junction Box (BJB) Fuses 46 (10A) and 54 (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 A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
No
INSTALL the removed fuses.
If the vehicle is equipped with a telematics module, GO to O6.
If the vehicle is not equipped with a telematics module, GO to O7.
O6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TELEMATICS MODULE DISABLED
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: Telematics Module Inline Fuse (3A).
- 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 O12.
No
INSTALL the removed fuse. GO to O7.
O7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE DISABLED
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: BJB (Battery Junction Box) Fuse 53 (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 B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to O8.
O8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE Instrument Panel Cluster (IPC)
DISABLED
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: SJB (Smart Junction Box) 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 Panel Cluster (IPC) Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. For stripped chassis, an intermittent fault is not present, GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
Otherwise, GO to O9.
O9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM (Restraints Control Module) DISABLED
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: SJB (Smart Junction Box) Fuse 32 (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 D. Pinpoint Test D: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse.
If the vehicle is equipped with a TBC (Trailer Brake Control) module, GO to O10.
If the vehicle is not equipped with a TBC (Trailer Brake Control) module, an intermittent fault is not present. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
O10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TBC (Trailer Brake Control) MODULE DISABLED
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: SJB (Smart Junction Box) Fuse 33 (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 E. Pinpoint Test E: The Trailer Brake Control (TBC) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse.
If the vehicle is equipped with a Accessory Protocol Interface Module (APIM), GO to O11.
If the vehicle is not equipped with a APIM (Accessory Protocol Interface Module), an intermittent fault is not present. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
O11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM (Accessory Protocol Interface Module) DISABLED
NOTE: When re-running the network test, the network test application must first be closed or the screen display reverts back to the prior run network test results.
- Disconnect: SJB (Smart Junction Box) 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 fuse. GO to Pinpoint Test K. Pinpoint Test K: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. An intermittent fault is not present. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
O12 CHECK FOR CORRECT TELEMATICS MODULE OPERATION
- Disconnect the telematics module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the telematics module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new telematics module. 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.