Pinpoint Test M: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond
Communications Network
Pinpoint Test M: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding During The Network Test
Normal Operation
An open in circuit (HS-CAN +) or (HS-CAN -) may cause intermittent or unreliable communication to all modules on the HS-CAN. The HS-CAN is used for communication between the following modules:
- ABS module
- Instrument Cluster (IC)
- PCM
- Vehicle Dynamics Module (VDM)
In the event that either circuit 1827 (WH/LG) or 1828 (PK/LG) becomes 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 M: INTERMITTENT NO HS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING THE 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 need to be cleared after the diagnostic procedure is completed.
NOTE: Failure to disconnect the battery will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.
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M1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool cable from the DLC.
- Inspect DLC pins 6 and 14 for damage.
- Are DLC pins 6 and 14 OK?
Yes
GO to M2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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M2 CHECK THE HS-CAN TERMINATION RESISTANCE
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC C251-6, circuit 1827 (WH/LG), harness side and the DLC C251-14, circuit 1828 (PK/LG), harness side.
- Is the resistance between 54 and 132 ohms?
Yes
GO to M3.
No
CONNECT the negative battery cable. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication
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M3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC C251-6, circuit 1827 (WH/LG), harness side and ground; and between the DLC C251-14, circuit 1828 (PK/LG), harness side and ground.
- Are the resistances greater than 1,000 ohms?
Yes
GO to M4.
No
CONNECT the negative battery cable. GO to Pinpoint Test N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication
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M4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect: Negative Battery Cable.
- Ignition ON.
- Measure the voltage between the DLC C251-6, circuit 1827 (WH/LG), harness side and ground; and between the DLC C251-14, circuit 1828 (PK/LG), harness side and ground.
- Is the voltage greater than 6 volts?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to M5.
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M5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED
- Disconnect: BJB Fuses 3 (10A) and 20 (15A), CJB Fuse 6 (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. GO to M6.
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M6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE VDM DISABLED
- Disconnect: BJB Fuse 13 (10A) and CJB Fuse 13 (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 M7.
No
INSTALL the removed fuses. GO to M8.
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M7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE DISCONNECTED
- Ignition OFF.
- Disconnect: ABS Module C135.
- Ignition ON.
- 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 ABS module. GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
CONNECT the ABS module. GO to Pinpoint Test F. Pinpoint Test F: The Vehicle Dynamics Module (VDM) Does Not Respond To The Scan Tool
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M8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED
- Disconnect: CJB Fuse 8 (10A), 13 (10A) and 25 (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 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 A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
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