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Pinpoint Test S: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond




Communications Network

Pinpoint Tests

Pinpoint Test S: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding During Network Test

Normal Operation

An open in circuit VDB04 (WH/BU) (HS-CAN +) or VDB05 (WH) (HS-CAN -) may cause intermittent or unreliable communication to all modules on the High Speed Controller Area Network (HS-CAN). The HS-CAN is used for communication between the following modules:

- ABS module
- Accessory Protocol Interface Module (APIM) (if equipped)
- Trailer Brake Control (TBC) module (if equipped)
- PCM
- Restraints Control Module (RCM)
- Auxiliary Heater Control Module (AHCM) (diesel engine only, if equipped)
- Transmission Control Module (TCM) (diesel engine only, if equipped)
- Electronic Variable Response Turbocharger (EVRT) actuator (diesel engine only)
- Instrument Cluster (IC)

In the event that either circuit VDB04 (WH/BU) or VDB05 (WH) become open to any 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 S: INTERMITTENT NO HIGH SPEED CONTROLLER AREA NETWORK (HS-CAN) COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST

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.

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S1 CHECK THE DLC PINS FOR DAMAGE


- Ignition OFF.
- Disconnect the scan tool cable from the Data Link Connector (DLC).
- Inspect DLC pins 6 and 14 for damage.




- Are DLC pins 6 and 14 OK?

Yes
GO to S2.

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

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S2 CHECK THE HS-CAN TERMINATION RESISTANCE


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.




- Is the resistance between 54 and 66 ohms?

Yes
GO to S3.

No
Go To Pinpoint Test R. Pinpoint Test R: No ISO 9141 Network Communication

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S3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND


- Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground.




- Are the resistances greater than 5,000 ohms?

Yes
CONNECT the negative battery cable. GO to S4.

No
Go To Pinpoint Test R. Pinpoint Test R: No ISO 9141 Network Communication

-------------------------------------------------
S4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition ON.
- Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground.




- Is the voltage greater than 6 volts?

Yes
REPAIR the short to voltage. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
GO to S5.

-------------------------------------------------
S5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED


NOTE: An Integrated Diagnostic System (IDS) 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.

NOTE: When a vehicle is manually identified by a PCM part number, calibration number or tear tag, the IDS 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 be first closed or the screen display will revert back to the prior run network test results.

- Disconnect: Battery Junction Box (BJB) Fuses 71 (5A) and 76 (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 A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to S6.

-------------------------------------------------
S6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE 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: BJB Fuse 77 (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
If the vehicle is equipped with a TBC module, INSTALL the removed fuse. GO to S7.

If the vehicle is not equipped with a TBC module, INSTALL the removed fuse. GO to S8.

INSTALL the removed fuse. GO to S7.

-------------------------------------------------
S7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TBC MODULE 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: Smart Junction Box (SJB) Fuse 33 (10A) and BJB Fuse 5 (30A).
- 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 D. Pinpoint Test D: The Trailer Brake Control Module (TBC) Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to S8.

-------------------------------------------------
S8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM 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 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 E. Pinpoint Test E: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool

No
If the vehicle is equipped with an APIM, INSTALL the removed fuse. GO to S9.

If the vehicle is not equipped with an APIM, INSTALL the removed fuse. GO to S10.

-------------------------------------------------
S9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM 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 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 fuse. Go To Pinpoint Test Q. Pinpoint Test Q: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to S10.

-------------------------------------------------
S10 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 Fuse 26 (10A) and 36 (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
If the vehicle is equipped with a diesel engine, INSTALL the removed fuses. GO to S11.

If the vehicle is not equipped with a diesel engine, INSTALL the removed fuses. An intermittent fault is not present. Go To Pinpoint Test T. Pinpoint Test T: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

-------------------------------------------------
S11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE EVRT ACTUATOR 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: BJB Fuse 74 (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. REFER to Computers and Control Systems Information, Pinpoint Tests, pinpoint test AK to diagnose no communication with the EVRT actuator.

No
If the vehicle is equipped with a TCM, INSTALL the removed fuse. GO to S12.

If the vehicle is not equipped with a TCM, INSTALL the removed fuse. GO to S13.

-------------------------------------------------
S12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TCM 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: BJB Fuses 37 (10A) and 72 (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 G. Pinpoint Test G: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to S13.

-------------------------------------------------
S13 VERIFY VEHICLE EQUIPMENT - AHCM


- Inspect the vehicle for an AHCM. This module is present on some diesel engine equipped vehicles.
- Is the vehicle equipped with an AHCM?

Yes
GO to S14.

No
An intermittent fault is not present. Go To Pinpoint Test T. Pinpoint Test T: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

-------------------------------------------------
S14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AHCM 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 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 fuse. Go To Pinpoint Test F. Pinpoint Test F: The Auxiliary Heater Control Module (AHCM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. An intermittent fault is not present. Go To Pinpoint Test T. Pinpoint Test T: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

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