Expedition 2WD V8-5.4L (2009)
Pinpoint Tests
Pinpoint Test W: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not
Responding During Network Test
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable, circuits VDB04 (WH/BU) and VDB05 (WH). The PCM,
the Transmission Control Module (TCM), the ABS module, the Restraints Control Module (RCM), the 4X4 control module (if equipped), the Vehicle
Dynamics Module (VDM) (if equipped) and the Instrument Cluster (IC) all communicate with the scan tool using the 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.
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Data Link Connector (DLC)
PINPOINT TEST W: 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. See: Initial Inspection and Diagnostic Overview/Communications Network/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.
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W1 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 W2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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W2 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.
