Operation CHARM: Car repair manuals for everyone.
Home >> Lincoln >> 2006 >> Navigator 4WD V8-5.4L VIN 5 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Test D: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Test D: The Powertrain Control Module (PCM) Does Not Respond to the Diagnostic Tool

PINPOINT TEST D: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL


D1-D2:






D2-D3:






Normal Operation
The PCM communicates with the diagnostic tool through the high speed controller area network (CAN), circuits 1814 (WH/LB) and 1815 (PK/LB). Check the high speed CAN circuits 1814 (WH/LB) and 1815 (PK/LB) between the PCM C175b and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the CAN circuits, damage to the DLC C251, damage to the PCM C175b, or a problem in an in-line connector.

Possible Causes
- high speed CAN circuit 1814 (WH/LB) open
- high speed CAN circuit 1815 (PK/LB) open
- PCM
- PCM C175b
pro multis · About Operation CHARM