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Home >> Lincoln >> 2007 >> MKZ FWD V6-3.5L VIN T >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Test B: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool
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Test B: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool

PINPOINT TEST B: THE TRANSMISSION CONTROL MODULE (TCM) DOES NOT RESPOND TO THE SCAN TOOL


B1:






B1-B2:






B3-B4:






B4-B5:






Normal Operation
The TCM 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 TCM. The FNR5 transaxle and the 6 speed transaxle both communicate on the HS-CAN network. The TCM shares the HS-CAN network with the powertrain control module (PCM), the anti-lock brake system (ABS) module, the restraints control module (RCM), the four wheel drive (4WD) control module (if equipped), the occupant classification sensor module and the instrument cluster. Voltage for the TCM is provided by circuits CBP18 (GY/OG), SBP07 (WH/RD) and SBB16 (VT/RD). Both circuits GD120 (BK/GN) provide ground.

Possible Causes
- Fuse
- Circuit CBP18 (GY/OG) open
- Circuit GD120 (BK/GN) open
- Circuit SBB16 (VT/RD) open
- Circuit SBP07 (WH/RD) open
- Circuit VDB04 (WH/BU) open (HS-CAN +)
- Circuit VDB05 (WH) open (HS-CAN -)
- TCM
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