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DIAGNOSIS AND TESTING > COMMUNICATIONS NETWORK > DIAGNOSTIC
ROUTINES > PINPOINT TEST U: THE TCM DOES NOT RESPOND TO THE SCAN
TOOL > PINPOINT TEST U: THE TCM (TRANSMISSION CONTROL MODULE) DOES
NOT RESPOND TO THE SCAN TOOL
NOTE: Failure to disconnect the battery when instructed will
result in false resistance readings.
U1 CHECK THE TCM (TRANSMISSION CONTROL MODULE) VOLTAGE SUPPLY CIRCUIT FOR
AN OPEN
Ignition OFF.
Disconnect: TCM C1750A.
Ignition ON.
Measure:
Positive Lead Measurement/Action Negative Lead
C1750A-1 Ground
C1750A-2 Ground
C1750A-18 Ground
C1750A-31 Ground
Are the voltages greater than 11 volts?
Yes : GO to U2
No : VERIFY the BJB fuse 15 (25A), 26 (15A) and 38 (15A) are OK. If OK, REPAIR the
circuit in question. If not OK, REFER to the OEM WIRING DIAGRAMS -- EXCEPT ELECTRIC
to identify the possible causes of the circuit short.
U2 CHECK THE TCM (TRANSMISSION CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN
Ignition OFF.
Measure:
Positive Lead Measurement/Action Negative Lead
C1750A-3 Ground
C1750A-4 Ground
C1750A-5 Ground
C1750A-6 Ground
YMMS: Jan 28, 2021
Engine: 2.0L Eng License:
VIN: Odometer:
2014 Ford Focus SE
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Are the resistances less than 3 ohms?
Yes : GO to U3
No : REPAIR the circuit in question.
U3 CHECK THE HS-CAN (HIGH SPEED-CONTROLLER AREA NETWORK) CIRCUITS BETWEEN
THE TCM (TRANSMISSION CONTROL MODULE) AND THE DLC (DATA LINK CONNECTOR)
FOR AN OPEN
Measure:
Positive Lead Measurement/Action Negative Lead
C1750A-34 C251-6
C1750A-35 C251-14
Are the resistances less than 3 ohms?
Yes : GO to U4
No : REPAIR the circuit in question.
U4 CHECK FOR CORRECT TCM (TRANSMISSION CONTROL MODULE) OPERATION
Ignition OFF.
Disconnect and inspect all the TCM connectors.
Repair:
corrosion (install new connector or terminals - clean module pins)
damaged or bent pins - install new terminals/pins
pushed-out pins - install new pins as necessary
Reconnect the TCM connectors. Make sure they seat and latch correctly.
Operate the system and determine if the concern is still present.
Is the concern still present?
Yes : CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists
for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical
Service Bulletins (TSBs) address this concern, INSTALL a new TCM .
REFER to: TRANSMISSION CONTROL MODULE (TCM) .
No : The system is operating correctly at this time. The concern may have been caused by
module connections. ADDRESS the root cause of any connector or pin issues.
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