Dodge Caliber. Manual — part 272
Engine/CVT Integration Control (CAN Communication Control)
In order to improve gearshift feeling and to perform controls such as prevention of engine slowdown, engine power
control signals are intercommunicated between the engine ECM and the TCM, and real-time cooperative controls
depending on vehicle driving conditions are performed.
TCM sends information such as fast slowdown signals, lock-up signals, torque down request signals to ECM, while
receiving information such as torque down permission/prohibition signals, lock-up permission/prohibition signals,
throttle position from ECM.
Fail-safe Function
If an unexpected signal is sent from any sensor, switch, solenoid etc., this function controls the CVT to make driving
as smooth as possible.
Secondary Speed Sensor
The shift pattern is changed in accordance with throttle position when an unexpected signal is sent from the output
speed sensor (secondary speed sensor) to the TCM. The manual mode position or the sports mode position is
inhibited, and the transaxle is put in “D”.
Primary Speed Sensor
The shift pattern is changed in accordance with throttle position and secondary speed (vehicle speed) when an
unexpected signal is sent from the primary speed sensor to the TCM. The manual mode function or the sports mode
function is inhibited, and the transaxle is put in “D”.
PNP Switch
If an unexpected signal is sent from the PNP switch to the TCM, the transaxle is put in “D”.
Fluid Temperature Sensor
If an unexpected signal is sent from the fluid temperature sensor to the TCM, the gear ratio obtained immediately
before receiving the unexpected signal is maintained and the gear ratio is controlled to keep engine speed under
5,000 rpm (approximately), depending on driving conditions.
Secondary Pressure Sensor
If an unexpected signal is sent from the secondary pressure sensor to the TCM, the secondary pressure feedback
control is stopped and the offset value obtained immediately before the non-standard condition occurs is used to
control line pressure.
Line Pressure Solenoid
If an unexpected condition of the solenoid is detected by the TCM, the line pressure solenoid is turned OFF to
achieve the maximum fluid pressure.
Secondary Pressure Solenoid
If an unexpected condition of the secondary solenoid is detected by the TCM, the secondary pressure solenoid is
turned OFF to achieve the maximum fluid pressure.
Lock-up solenoid
If an unexpected condition of the lock-up solenoid is detected by the TCM, the lock-up solenoid is turned OFF to
cancel the lock-up.
Stepping Motor
If an unexpected condition of the stepping motor is detected by the TCM, the stepping motor coil phases “A”
through “D” are all turned OFF to hold the gear ratio used immediately before the unexpected condition occurred.
Lock-up/Selection Switching Solenoid
If an unexpected condition of the solenoid is detected by the TCM, the lock-up/selection switching solenoid is turned
OFF to cancel the lock-up.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
8E - 199
Backup Power Supply
Transaxle assembly is protected by limiting the engine torque when the memory back-up power supply for control-
ling from the battery is not supplied to the TCM. Normal status is restored when turning the ignition switch OFF to
ON after power is normally supplied
TCM
•
1. Shift control
•
2. Line pressure control
•
3. Selection control
•
4. Lock-up control
•
5. Engine/CVT integration control [CAN communication control]
•
6. Self-diagnosis function
•
7. Fail-safe function
Primary Speed Sensor, Secondary Speed Sensor
Primary Speed Sensor It is installed near the CVT fluid cooler in the transaxle case. It sends rotating speed of the
primary pulley (input shaft) to the TCM as a pulse signal.
Secondary Speed Sensor It is installed near the output gear part in the transaxle case. It sends rotating speed of
the secondary pulley (output shaft) to the TCM as a pulse signal. TCM converts the pulse signal to vehicle speed.
STANDARD PROCEDURE - TRANSMISSION CONTROL MODULE INITIALIZATION
INITIAL LEARN (BRAND-NEW MODULE, MEMORY ALREADY CLEAR
) Battery must be connected. If TIPM is to be configured, do this, then Turn ignition key to OFF/LOCKED briefly,
then back to RUN. Shifter must be in PARK or NEUTRAL, engine not running.
1. Turn Ignition key to RUN for 4 seconds to allow reading of new values.
2. Clear fault codes.
3. Turn ignition key to OFF/LOCKED for 2 seconds to allow storing new values in EEROM.
4. Turn ignition key to RUN.
5. At least 7 seconds, Read fault codes.
RELEARN, AFTER REPLACING A TRANSAXLE
1. Clear learning memory using the scan tool.
2. Turn ignition key to OFF/LOCKED for 2 seconds to allow clearing of values in EEROM.
3. Turn Ignition key to RUN for 4 seconds to allow reading of new values.
4. Clear fault codes.
5. Turn ignition key to OFF/LOCKED for 2 seconds to allow storing new values in EEROM.
6. Turn ignition key to RUN.
7. At least 7 seconds later, Read fault codes.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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REMOVAL
1. The TCM (2) is located between the brake pedal
bracket (1) and the left kick panel (3).
2. Unplug the two electrical connectors (2) at the
TCM.
3. Remove the two nuts (1) that hold the TCM to the
bulkhead.
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
8E - 201
4. Remove the TCM.
INSTALLATION
1. Install TCM mounting bracket holes (1) over the
two studs on the bulkhead.
8E - 202
ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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