Electronic Control Modules: Other Chrysler Pacifica CS

ABM INPUTS

1. Wheel speed sensors (four)
2. Brake lamp switch
3. Ignition switch
4. System and pump voltage
5. Ground
6. Traction control switch (if equipped)
7. Diagnostic communication (PCI)

ABM OUTPUTS

1. Amber ABS warning indicator lamp actuation (via BUS)
2. Red BRAKE warning indicator lamp actuation (via BUS)
3. Instrument cluster and EVIC communication (PCI)
4. Traction control lamps (if equipped)
5. Diagnostic communication (PCI, via BUS)

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

1. Disconnect negative (-) battery cable from battery post and isolate.
2. Raise and support vehicle. «(Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCEDURE)»(ref-245418-S28339325062006110200000)
3. If not equipped with traction control, remove three screws attaching the antilock brake module (ABM) to the HCU. (Scheme 6) 1 - MOUNTING SCREWS 2 - ABM
4. If equipped with traction control, remove four screws attaching antilock brake module (ABM) to HCU. (Scheme 7) 1 - MOUNTING SCREWS 2 - ABM
5. Slide ABM off HCU. (Scheme 8) 1 - ABM 2 - HCU 3 - SOLENOID VALVE STEM
6. Disconnect the 47-way connector from the ABM by depressing the tabs on each side of the connector cover. (Scheme 9), then pulling outward and upward on the lower half of the cover until it locks into position pointing straight outward. The connector can then be pulled straight outward off the ABM. (Scheme 10) 1 - ABM (PART OF ICU) 2 - WIRING HARNESS CONNECTOR
7. Remove ABM from vehicle.

Scheme 11

1. Clean any debris off the mating surfaces of the HCU and ABM.
2. Replace solenoid valve stem seals. (Scheme 11) These seals can be easily removed and installed by hand. Do not use any type of sharp instrument or damage to the components may occur. 1 - SEAL 2 - SOLENOID VALVE STEM
3. Replace pump/motor connector O-ring if not new. see scheme 10 1 - O-RING 2 - O-RING MOUNTING GROOVE
4. With connector cover completely open. (Scheme 10), install 47-way wiring connector into socket of the ABM and close cover, locking connector in place.
5. Align ABM solenoids and pump/motor wiring connector with HCU valves and connector passage. (Scheme 8) Slide ABM onto HCU.
6. If not equipped with traction control, install three screws attaching the ABM to the HCU. (Scheme 6) Tighten mounting screws to 2 N.m (17 in. lbs.) torque.
7. If equipped with traction control, install four screws attaching ABM to HCU. (Scheme 7) Tighten mounting screws to 2 N.m (17 in. lbs.) torque.
8. Lower vehicle.
9. Connect negative battery cable to battery post.
10. Hook up scan tool to initialize ABM. Check and clear any faults.

CAB INPUTS

1. Wheel speed sensors (four)
2. Brake lamp switch
3. Ignition switch
4. System and pump voltage
5. Ground
6. Traction control switch (if equipped)
7. Diagnostic communication (PCI)

CAB OUTPUTS

1. Amber ABS warning indicator lamp actuation (via BUS)
2. Red BRAKE warning indicator lamp actuation (via BUS)
3. Instrument cluster and EVIC communication (PCI)
4. Traction control lamps (if equipped)
5. Diagnostic communication (PCI, via BUS)

Scheme 12

Scheme 13

1. Disconnect negative (-) battery cable from battery post and isolate.
2. Raise and support vehicle. «(Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCEDURE)»(ref-245418-S28339325062006110200000)
3. Remove 3 screws attaching CAB to HCU. (Scheme 13) 1 - CAB 2 - MOUNTING SCREWS
4. Slide CAB off HCU. see scheme 14
5. Disconnect 47-way wiring connector at CAB. (Scheme 14) 1 - ICU MOUNTING BOLTS ON FRAME RAIL 2 - HARNESS (CAB) WIRING CONNECTOR 3 - CAB MOUNTED TO ICU
6. Remove CAB.

Scheme 14

1. Connect 47-way wiring connector at CAB. (Scheme 14)
2. Align CAB solenoids and pump/motor wiring connector with HCU valves and connector passage. see scheme 14 Slide CAB onto HCU. 1 - CAB 2 - VALVES 3 - HCU 4 - PUMP/MOTOR WIRING CONNECTOR 5 - PUMP/MOTOR
3. Install 3 screws mounting CAB to HCU. (Scheme 13) Tighten CAB mounting screws to 2 N.m (17 in. lbs.) torque.
4. Lower vehicle.
5. Connect negative battery cable to battery post.
6. Hook up DRBIII(R) to initialize CAB. Check and clear any faults.

CLUTCH VOLUME INDEX (CVI)

An important function of the PCM is to monitor Clutch Volume Index (CVI). CVIs represent the volume of fluid needed to compress a clutch pack.

The PCM monitors gear ratio changes by monitoring the Input and Output Speed Sensors. The Input, or Turbine Speed Sensor sends an electrical signal to the PCM that represents input shaft rpm. The Output Speed Sensor provides the PCM with output shaft speed information.

By comparing the two inputs, the PCM can determine transaxle gear ratio. This is important to the CVI calculation because the PCM determines CVIs by monitoring how long it takes for a gear change to occur. see scheme 16

Scheme 15

Gear ratios can be determined by using the DRB Scan Tool and reading the Input/Output Speed Sensor values in the "Monitors" display. Gear ratio can be obtained by dividing the Input Speed Sensor value by the Output Speed Sensor value.

For example, if the input shaft is rotating at 1000 rpm and the output shaft is rotating at 500 rpm, then the PCM can determine that the gear ratio is 2:1. In direct drive (3rd gear), the gear ratio changes to 1:1. The gear ratio changes as clutches are applied and released. By monitoring the length of time it takes for the gear ratio to change following a shift request, the PCM can determine the volume of fluid used to apply or release a friction element.

The volume of transmission fluid needed to apply the friction elements are continuously updated for adaptive controls. As friction material wears, the volume of fluid need to apply the element increases.

Certain mechanical problems within the clutch assemblies (broken return springs, out of position snap rings, excessive clutch pack clearance, improper assembly, etc.) can cause inadequate or out-of-range clutch volumes. Also, defective Input/Output Speed Sensors and wiring can cause these conditions. The following chart identifies the appropriate clutch volumes and when they are monitored/updated

SHIFT SCHEDULES

As mentioned earlier, the PCM has programming that allows it to select a variety of shift schedules. Shift schedule selection is dependent on the following

1. Shift lever position
2. Throttle position
3. Engine load
4. Fluid temperature
5. Software level

As driving conditions change, the PCM appropriately adjusts the shift schedule. Refer to the following chart to determine the appropriate operation expected, depending on driving conditions.

DATA BUS COMMUNICATION RECEIVE - PCM INPUT

The PCM uses the SCI communication bus to preform engine diagnostics and flash operations. The transmission side of the PCM uses the SCI communication bus to flash new software. However, diagnostics is performed via the vehicles J1850 bus for the transmission side of the PCM.

PCM GROUND

Ground is provided through multiple pins of the PCM connector. Depending on the vehicle there may be as many as two different ground pins. There are power grounds and sensor grounds.

The power grounds are used to control the ground side relays, solenoids, ignition coil or injectors. The signal ground is used for any input that uses sensor return for ground, and the ground side of any internal processing component.

The PCM case is shielded to prevent RFI and EMI. The PCM case is grounded and must be firmly attached to a good, clean body ground.

Internally all grounds are connected together, however there is noise suppression on the sensor ground. For EMI and RFI protection the housing and cover are also grounded separately from the ground pins.

5 VOLT SUPPLY - PCM OUTPUT

The PCM supplies 5 volts to the following sensors

1. A/C pressure transducer
2. Ambient Temperature sensor
3. Battery temperature
4. Camshaft Position Sensor (NGC)
5. Crankshaft Position Sensor (NGC)
6. Engine coolant temperature sensor
7. Inlet Air Temperature Sensor
8. Knock sensor
9. Linear EGR solenoid (if equipped)
10. Manifold absolute pressure sensor
11. Oil Pressure Switch
12. Throttle position sensor

BULB CHECK

Key on: Bulb illuminated until vehicle starts, as long as all once per trip (readiness) monitors completed. If monitors have not been completed, then: Key on: bulb check for about 5 to 8 seconds, lamp then flashes if once per trip (readiness) monitors have not been completed until vehicle is started, then MIL is extinguished.

STANDARD PROCEDURE - PINION FACTOR SETTING

Note. This procedure must be performed if the PCM has been replaced with a NEW or replacement unit. Failure to perform this procedure will result in an inoperative or improperly calibrated speedometer.

The vehicle speed readings for the speedometer are taken from the output speed sensor. The PCM must be calibrated to the different combinations of equipment (final drive and tires) available. Pinion Factor allows the technician to set the Powertrain Control Module initial setting so that the speedometer readings will be correct. To properly read and/or reset the Pinion Factor, it is necessary to use a scan tool.

1. Plug the scan tool into the diagnostic connector located under the instrument panel.
2. Select the Transmission menu.
3. Select the Miscellaneous menu.
4. Select Pinion Factor. Then follow the instructions on the scan tool screen.

STANDARD PROCEDURE - QUICK LEARN PROCEDURE

The quick learn procedure requires the use of the DRBIII(R) scan tool. This program allows the PCM to recalibrate itself. This will provide the best possible transaxle operation.

Note. The quick learn procedure should be performed if any of the following procedures are performed

1. Transaxle Assembly Replacement
2. Powertrain Control Module Replacement
3. Solenoid/Pressure Switch Assembly Replacement
4. Clutch Plate and/or Seal Replacement
5. Valve Body Replacement or Recondition

To perform the Quick Learn Procedure, the following conditions must be met

1. The brakes must be applied
2. The engine speed must be above 500 rpm
3. The throttle angle (TPS) must be less than 3 degrees
4. The shift lever position must stay until prompted to shift to overdrive
5. The shift lever position must stay in overdrive after the Shift to Overdrive prompt until the DRBIII(R) indicates the procedure is complete
6. The calculated oil temperature must be above 60° and below 200°

1. Plug the DRBIII(R) scan tool into the diagnostic connector. The connector is located under the instrument panel.
2. Go to the Transmission screen.
3. Go to the Miscellaneous screen.
4. Select Quick Learn Procedure. Follow the instructions of the DRBIII(R) to perform the Quick Learn Procedure.

Scheme 16

1. Disconnect the negative battery cable.
2. Raise vehicle and support.
3. Remove the left front wheel.
4. Remove the left front splash shield.
5. Unlock and remove the 4 connectors. (Scheme 16)
6. Remove the 3 mounting screws. see scheme 18
7. Remove the PCM.