Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One or More Modules Are Not Respond
Communications Network
Pinpoint Tests
Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Responding During Network Test
Normal Operation
An open 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). In the event that one of the 2 network circuits (HS-CAN + or HS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.
The following modules communicate on the HS-CAN:
- 4X4 control module (if equipped)
- ABS module
- Accessory Protocol Interface Module (APIM) (if equipped)
- Instrument Cluster (IC)
- Occupant Classification System Module (OCSM)
- PCM
- Restraints Control Module (RCM)
- Transmission Control Module (TCM) (if equipped)
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
PINPOINT TEST U: INTERMITTENT NO 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 the DTCs from all modules after the diagnostic procedure is complete.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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U1 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 U2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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U2 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 U3.
No
Go To Pinpoint Test S. Pinpoint Test S: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
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U3 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 1,000 ohms?
Yes
GO to U4.
No
Go To Pinpoint Test S. Pinpoint Test S: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
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U4 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 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 circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to U5.
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U5 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) Fuse 23 (10A), 26 (7.5A), 42 (15A (3.0L, 3.5L) or 47 (15A) (2.3L).
- 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 U6.
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U6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE AND 4X4 CONTROL MODULE (IF EQUIPPED) 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 28 (20A) and 20 (7.5A) (If Equipped).
- 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. If the vehicle is equipped with a 4X4 control module, GO to U7. If the vehicle is not equipped with a 4X4 control module, Go To Pinpoint Test C. Pinpoint Test C: The ABS Module Does Not Respond to the Scan Tool
No
INSTALL the removed fuses. GO to U8.
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U7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE DISCONNECTED
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: ABS Module C135.
- 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 C.Pinpoint Test C: The ABS Module Does Not Respond to the Scan Tool
No
CONNECT the ABS module. Go To Pinpoint Test E.Pinpoint Test E: The 4X4 Control Module Does Not Respond to the Scan Tool
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U8 VERIFY VEHICLE EQUIPMENT - AUTOMATIC TRANSAXLE
- Inspect the vehicle for an automatic transaxle.
- Is the vehicle equipped with an automatic transaxle?
Yes
GO to U9.
No
GO to U10.
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U9 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 Fuse 16 (15A) and 23 (10A) (FNR5 Transaxle Only) or 26 (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 B. Pinpoint Test B: The Transmission Control Module (TCM) Does Not Respond to the Scan Tool
No
INSTALL the removed fuses. GO to U10.
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U10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE INSTRUMENT CLUSTER (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 13 (10A), 23 (7.5A) and 27 (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 G. Pinpoint Test G: The Instrument Cluster (IC) Does Not Respond to the Scan Tool
No
INSTALL the removed fuses. GO to U11.
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U11 VERIFY VEHICLE EQUIPMENT - APIM
- Inspect the vehicle for an Accessory Protocol Interface Module (APIM).
- Is the vehicle equipped with an APIM?
Yes
GO to U12.
No
GO to U13.
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U12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISCONNECTED
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: APIM C3338.
- 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 APIM. Go To Pinpoint Test Q. Pinpoint Test Q: The Accessory Protocol Interface Module (APIM) Does Not Respond to the Scan Tool
No
GO to U13.
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U13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RESTRAINTS CONTROL MODULE (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 25 (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. 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. GO to U14.
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U14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCCUPANT CLASSIFICATION SYSTEM MODULE (OCSM) 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 24 (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. Go To Pinpoint Test F. Pinpoint Test F: The Occupant Classification System Module (OCSM) Does Not Respond to the Scan Tool
No
INSTALL the removed fuse. An intermittent fault is not present. Go To Pinpoint Test S. Pinpoint Test S: Intermittent No Medium Speed Controller Area Network (MS-CAN) Communication, One Or More Modules Are Not Respo
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