Pinpoint Test O: Intermittent No High Speed Controller Area Network (HS-CAN) Communication
Communications Network
Pinpoint Test O: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Refer to Wiring Diagrams Set 14, Module Communications Network for schematic and connector information. Electrical Diagrams
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable.
In the event that either the HS-CAN (High Speed Controller Area Network) (+) or HS-CAN (High Speed Controller Area Network) (-) circuit 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
- Data Link Connector (DLC)
PINPOINT TEST O : INTERMITTENT NO HS-CAN (High Speed Controller Area Network) COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST
NOTE: Various modules 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 DLC (Data Link Connector).
- 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
- Disconnect: Negative Battery Cable.
- Measure the resistance between the DLC (Data Link Connector) C251-6, circuit 4-EC7 (GY/RD)/4-EC8 (GY/VT), harness side and the DLC (Data Link Connector) C251-14, circuit 5-EC7 (BU/RD)/5-EC8 (BU/WH), harness side.
Is the resistance between 54 and 66 ohms?
Yes
GO to O3.
No
GO to Pinpoint Test M. Pinpoint Test M: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication
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 4-EC7 (GY/RD)/4-EC8 (GY/VT), harness side and ground; and between the DLC (Data Link Connector) C251-14, circuit 5-EC7 (BU/RD)/5-EC8 (BU/WH), harness side and ground.
Are the resistances greater than 1,000 ohms?
Yes
GO to O4.
No
GO to Pinpoint Test M. Pinpoint Test M: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication
O4 CHECK THE HS-CAN (High Speed Controller Area Network) (+) AND HS-CAN (High Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect: Negative Battery Cable.
- Ignition ON.
- Measure the voltage between the DLC (Data Link Connector) C251-6, circuit 4-EC7 (GY/RD)/4-EC8 (GY/VT), harness side and ground; and between the DLC (Data Link Connector) C251-14, circuit 5-EC7 (BU/RD)/5-EC8 (BU/WH), harness side and ground.
Are the voltages greater than 6 volts?
Yes
REPAIR the circuit. 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 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 the 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) does 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 closed first or the screen display reverts back to the prior run network test results.
- Disconnect: Battery Junction Box (BJB) Fuses 5 (10A) and 28 (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 A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool
No
INSTALL the removed fuses. GO to O6.
O6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE AND SASM (Steering Angle Sensor Module) DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: BJB (Battery Junction Box) Fuse 15 (20A) and Central Junction Box (CJB) Fuse 161 (7.5A).
- 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 fuse.
If the vehicle is equipped with stability control, GO to O7.
If the vehicle is not equipped with stability control, GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. If the vehicle is equipped with SYNC(R), GO to O8. If the vehicle is not equipped with SYNC(R), GO to O9.
O7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SASM (Steering Angle Sensor Module) DISCONNECTED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: Steering Angle Sensor Module (SASM) C226.
- 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 a new SASM (Steering Angle Sensor Module).
No
CONNECT the SASM (Steering Angle Sensor Module). GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool
O8 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 be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: CJB (Central Junction Box) Fuses 151 (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 Pinpoint Test G. Pinpoint Test G: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to O9.
O9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC (Instrument Cluster) DISABLED
NOTE: When re-running the network test, the network test application must be closed first or the screen display reverts back to the prior run network test results.
- Disconnect: CJB (Central Junction Box) Fuses 148 (7.5A) and 179 (7.5A).
- 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 N. Pinpoint Test N: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding