F 550 2WD Super Duty V8-6.4L DSL Turbo (2008)
Information Bus: Pinpoint Tests
Test A: The Powertrain Control Module (PCM) Does Not Respond To The Scan Tool
PINPOINT TEST A: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE SCAN TOOL
Normal Operation
The PCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and
VDB05 (WH) (HS-CAN -) provide the network connection to the PCM. The PCM shares the HS-CAN network with the ABS module, trailer brake
control (TBC) module (if equipped), restraints control module (RCM), supplemental heater control module (diesel engine only, if equipped),
transmission control module (TCM) (diesel engine only, if equipped), variable geometry turbocharger (VGT) actuator (diesel engine only) and the
instrument cluster. Voltage for the PCM is provided by circuits CBB76 (BU/BN) and SBB36 (GN/RD). Circuit GD113 (BK/YE) provides ground.
Possible Causes
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Circuit VDB04 (WH/BU) open (HS-CAN +)
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Circuit VDB05 (WH) open (HS-CAN -)
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PCM
A1-A2
