Dodge Caliber. Manual — part 1240
U1146-LOST COMMUNICATION WITH EXTERNAL MEMORY
For a complete wiring diagram Refer to Section 8W.
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AUTOMATIC - CVT-ELECTRICAL DIAGNOSTICS
21 - 259
Theory of Operation
The first time the vehicle is started, the Transmission Control Module (TCM) receives hydraulic calibration data from
an external EEPROM (located in the transmission) and stores this information in the EEPROM of the TCM. If the
TCM can not read the external EEPROM in the transmission this DTC will set. It takes two consecutive failures to
turn on the MIL.
•
When Monitored:
Ignition on in the run position with a system voltage between 9.0 and 16.0 volts.
Shift lever in Park or Reverse position.
•
Set Condition:
Communication between the TCM and the EEPROM in the transmission is not active for the period of 5 sec-
onds.
Possible Causes
(T327) DATA IN/OUT SELECT CIRCUIT SHORT TO VOLTAGE
(T313) CHIP SELECT CIRCUIT SHORT TO VOLTAGE
(T302) CLOCK SELECT CIRCUIT SHORT TO VOLTAGE
(T327) DATA IN/OUT SELECT CIRCUIT OPEN
(T302) CLOCK SELECT CIRCUIT OPEN
(T302) CLOCK SELECT CIRCUIT SHORT TO GROUND
(T327) DATA IN/OUT SELECT CIRCUIT SHORT TO GROUND
INTERNAL TRANSMISSION
TRANSMISSION CONTROL MODULE
Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
Diagnostic Test
1.
CHECK IF THE DTC IS ACTIVE
With the scan tool, read Transmission DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Go To 10
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AUTOMATIC - CVT-ELECTRICAL DIAGNOSTICS
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2.
CHECK THE (T327) DATA IN/OUT SELECT CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off to the lock position.
Disconnect the TCM C1 harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly har-
ness connector.
Ignition on, engine not running.
Measure the voltage of the (T327) Data IN/OUT Select circuit.
Is the voltage above .02 volts?
Yes
>> Repair the (T327) Data IN/OUT Select circuit for a short to
voltage.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANS-
MISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD
PROCEDURE)
No
>> Go To 3
3.
CHECK THE (T327) DATA IN/OUT SELECT CIRCUIT FOR A SHORT TO VOLTAGE
Measure the voltage of the (T327) Data IN/OUT Select circuit.
Is the voltage above 0.1 volts?
Yes
>> Repair the (T327) Data IN/OUT Select circuit for a short to voltage.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT -
STANDARD PROCEDURE)
No
>> Go To 4
4.
CHECK THE (T302) CLOCK SELECT CIRCUIT FOR A SHORT TO VOLTAGE
Measure the voltage of the (T302) Clock Select circuit.
Is the voltage above 0.2 volts?
Yes
>> Repair the (T302) Clock Select circuit for a short to voltage.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT -
STANDARD PROCEDURE)
No
>> Go To 5
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AUTOMATIC - CVT-ELECTRICAL DIAGNOSTICS
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5.
CHECK THE (T327) DATA IN/OUT SELECT CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Measure the resistance of the (T327) Data In/OutSelect circuit between
the TCM C1 harness connector and the Transmission Solenoid/Pres-
sure Switch Assembly harness connector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (T327) Data IN/OUT Select circuit for an open.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANS-
MISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD
PROCEDURE)
No
>> Go To 6
6.
CHECK THE (T302) CLOCK SELECT CIRCUIT FOR AN OPEN
Measure the resistance of the (T302) Clock Select circuit between the
TCM C1 harness connector and the Transmission Solenoid/Pressure
Switch Assembly harness connector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (T302) Clock Select circuit for an open.
Perform CVT VERIFICATION TEST. (Refer to 21 - TRANS-
MISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD
PROCEDURE)
No
>> Go To 7
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AUTOMATIC - CVT-ELECTRICAL DIAGNOSTICS
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