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Home >> Mercury >> 2011 >> Milan AWD V6-3.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test AD: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respon

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




Communications Network

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

Normal Operation

When one of the 2 High Speed Controller Area Network (HS-CAN) circuits becomes open to a module on the network, intermittent or unreliable communication to all modules on the HS-CAN may result.

The following modules communicate on the HS-CAN:

- 4X4 control module (if equipped)
- ABS module
- Accessory Protocol Interface Module (APIM) (if equipped)
- Air Conditioning Compressor Module (ACCM) (Hybrid only)
- Battery Energy Control Module (BECM) (Hybrid only)
- DC/DC (Hybrid only)
- Headlamp Control Module (HCM) (if equipped)
- Instrument Panel Cluster (IPC)
- Occupant Classification System Module (OCSM)
- PCM
- Power Steering Control Module (PSCM) (if equipped)
- Restraints Control Module (RCM)
- Transmission Control Module (TCM) (if equipped)

This pinpoint test is intended to diagnose the following:

- Circuit VDB04 (WH/BU) ( HS-CAN +) open
- Circuit VDB05 (WH) ( HS-CAN -) open


PINPOINT TEST AD: INTERMITTENT NO HS-CAN COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING 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 will need to be cleared after the diagnostic procedure is completed.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.

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AD1 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 AD2.

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

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AD2 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 AD3.

No
GO to Pinpoint Test W. Pinpoint Test W: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool

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AD3 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 AD4.

No
GO to Pinpoint Test W. Pinpoint Test W: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool

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AD4 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 AD5.

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AD5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED

- Disconnect: Gasoline Engine - Battery Junction Box (BJB) Fuses 23 (10A) and 46 (15A) .
- Disconnect: Hybrid - PCM C175b .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuses (gasoline engine) or CONNECT the PCM (hybrid). GO to Pinpoint Test A. Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

No
INSTALL the removed fuses (gasoline engine) or CONNECT the PCM (hybrid). If the vehicle is equipped with an Headlamp Control Module (HCM) and/or a Power Steering Control Module (PSCM), GO to AD6.

If the vehicle is not equipped with a HCM, GO to AD8.

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AD6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HCM (IF EQUIPPED) AND PSCM (IF EQUIPPED) DISABLED

- Disconnect: Smart Junction Box (SJB) Fuse 33 (10A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuse. If the vehicle is equipped with only a HCM, GO to Pinpoint Test I. Pinpoint Test I: The Headlamp Control Module (HCM) Does Not Respond To The Scan Tool

If the vehicle is equipped with only a PSCM, GO to Pinpoint Test D. Pinpoint Test D: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool

If the vehicle is equipped with both a HCM and PSCM, GO to AD7.

No
INSTALL the removed fuse. GO to AD8.

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AD7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HCM DISCONNECTED

- Disconnect: HCM C1600 .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
CONNECT the HCM. GO to Pinpoint Test I. Pinpoint Test I: The Headlamp Control Module (HCM) Does Not Respond To The Scan Tool

No
CONNECT the HCM. GO to Pinpoint Test D. Pinpoint Test D: The Power Steering Control Module (PSCM) Does Not Respond To The Scan Tool

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AD8 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM DISABLED

- Disconnect: SJB Fuse 32 (10A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN 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
INSTALL the removed fuse. For gasoline engine, GO to AD9. For hybrid, GO to AD10.

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AD9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE DISABLED - GASOLINE ENGINE

- Disconnect: Battery Junction Box (BJB) Fuse 42 (10A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN 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. If the vehicle is equipped with a 4X4 control module, GO to AD13.

If the vehicle is not equipped with a 4X4 control module, GO to AD14.

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AD10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACCM, DC/DC AND ABS MODULE DISABLED - HYBRID

- Disconnect: Battery Junction Box (BJB) Fuse 47 (10A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuse. GO to AD11.

No
INSTALL the removed fuse. If the vehicle is equipped with a 4X4 control module, GO to AD13.

If the vehicle is not equipped with a 4X4 control module, GO to AD14.

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AD11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACCM DISCONNECTED

- Disconnect: ACCM C1469a .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuses. GO to Pinpoint Test K. Pinpoint Test K: The Air Conditioning Compressor Module (ACCM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to AD12.

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AD12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DC/DC DISCONNECTED

- Disconnect: DC/DC C1457d .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuses. GO to Pinpoint Test L. Pinpoint Test L: The DC to DC Converter Control Module (DC/DC) Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to Pinpoint Test B. Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool

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AD13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 MODULE DISABLED

- Disconnect: SJB Fuses 11 (10A) and 35 (10A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuses. GO to Pinpoint Test H. Pinpoint Test H: The 4X4 Control Module Does Not Respond To The Scan Tool

No
INSTALL the removed fuses. GO to AD9.

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AD14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IPC DISABLED

- Disconnect: SJB Fuses 26 (15A) and 29 (5A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN 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. If the vehicle is equipped with an Accessory Protocol Interface Module (APIM) , GO to AD15.

If the vehicle is not equipped with an APIM,GO to AD16.

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AD15 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISABLED

- Disconnect: SJB Fuse 13 (5A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuse. GO to Pinpoint Test AA. Pinpoint Test AA: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

No
INSTALL the removed fuse. GO to AD16.

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AD16 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCSM DISABLED

- Disconnect: SJB Fuse 46 (7.5A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN 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. If the vehicle is equipped with a Transmission Control Module (TCM), GO to AD17.

If the vehicle is not equipped with a TCM, GO to AD18.

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AD17 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TCM DISABLED

- Disconnect: Gasoline Engine - SJB Fuse 44 (10A) and BJB Fuse 16 (5A) .
- Disconnect: Hybrid - TCM C1458a .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN modules pass the network test?

Yes
INSTALL the removed fuses (gasoline engine) or CONNECT the TCM (hybrid). 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 (gasoline engine) or CONNECT the TCM (hybrid). GO to AD18.

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AD18 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM DISABLED

- Disconnect: SJB Fuse 32 (10A) .
- Enter the following diagnostic mode on the scan tool: Network Test .
- Repeat the network test.
- Do all other HS-CAN 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
INSTALL the removed fuse. An intermittent fault is not present. GO to Pinpoint Test AC. Pinpoint Test AC: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

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