Electronic Control Modules - Service Information: Other RAM Pickup 2500

FLASH PROGRAMMING

Note. The wiTECH diagnostic application is the preferred method for flashing ECUs.

Note. Help using the wiTECH diagnostic application for flashing an ECU is available by selecting "Help" then "Help Contents" at the top of the wiTECH diagnostic application window.

Note. The wiTECH software level must be at the latest release to perform this procedure.

Note. The StarMobile Desktop Client may also be used to perform this flash procedure.

STANDARD PROCEDURE - MODULE PROGRAMMING

The Wireless Ignition Node (WIN) controls the Vehicle Theft Security System (VTSS), Remote Keyless Entry (RKE). When a Powertrain Control Module (PCM) is in need of replacement, perform the following steps in order

Note. The PCM and the WIN should never be replaced at the same time. They should be replaced independently of each other.

1. If applicable, first replace the PCM with the original WIN still connected to the vehicle.
2. Using a scan tool program the new PCM. (This will ensure the transfer of the Secret Key data from the original WIN into the new PCM).
3. Replace the WIN, using the scan tool program the new WIN module. This will transfer the Secret Key data from the PCM into the new WIN.
4. With the scan tool reprogram the key FOBIK to the new WIN.
5. Ensure all the customer's keys have been programmed to the new module.

Note. If the original keys do not successfully program to the new WIN after the proper procedures are followed correctly, programming new keys will be necessary.

PROGRAMMING THE SECRET KEY TO THE WIN

The secret key is an ID code that is unique to each WIN. This code is programmed and stored in the WIN, the PCM, and each ignition key transponder chip. When the PCM or WIN is replaced, it is necessary to program the Secret Key Code into the new module using a diagnostic scan tool. Follow the programming steps outlined in the diagnostic scan tool for PCM REPLACED , WIN REPLACED , or TIPM REPLACED under MISCELLANEOUS FUNCTIONS for the WIRELESS CONTROL MODULE menu item as appropriate.

Note. Programming the PCM or WIN is done using a diagnostic scan tool and a PIN to enter secure access mode. If three attempts are made to enter secure access mode using an incorrect PIN, secure access mode will be locked out for one hour. To exit this lockout mode, turn the ignition to the RUN position for one hour and then enter the correct PIN. Be certain that all accessories are turned OFF. Also, monitor the battery state and connect a battery charger if necessary.

PCM/WIN PROGRAMMING

When an PCM and the WIN are replaced at the same time, perform the following steps in order

1. Program the new WIN.
2. Replace all ignition keys and program them to the new WIN.

PROGRAMMING THE WIN

1. Connect a battery charger to the vehicle.
2. Connect the scan tool. NOTE: Have a unique vehicle PIN readily available before running the routine CAUTION: If the PCM and WIN are replaced at the same time, the PCM MUST be programmed before the WIN.
3. Select "ECU View".
4. Select "WIN".
5. Select "Miscellaneous Functions".
6. Select "WIN Replaced".
7. Enter the PIN when prompted.
8. Cycle ignition key after the successful routine completion.

Note. If the PCM and the WIN are replaced at the same time, all vehicle keys will need to be replaced and programmed to the new WIN.

PROGRAMMING IGNITION KEYS TO THE WIN

Each FOBIK has a unique ID code that is assigned at the time the key is manufactured. When a key is programmed into the WIN, the module learns the transponder ID code and the transponder acquires the unique Secret Key ID code from the WIN.

1. Connect a battery charger to the vehicle.
2. Connect the scan tool.
3. Have a unique vehicle PIN readily available before running the routine.
4. Ignition key should be in RUN position.
5. Select "ECU View".
6. Select "WIN Wireless Control".
7. Select "Miscellaneous Functions".
8. Select "Program Ignition Keys or Key FOB", Start
9. Enter the PIN when prompted.
10. Verify the correct information.
11. Cycle ignition key after the successful routine completion.

Note. If the original keys do not successfully program to the new WIN after the proper procedures are followed correctly, programming new keys will be necessary.

Note. A maximum of eight keys can be learned by the WIN. Once a key is learned by a WIN, that key has acquired the Secret Key for that WIN and cannot be transferred to any other WIN or vehicle.

PROGRAMMING THE PCM

1. Connect a battery charger to the vehicle.
2. Connect the scan tool.
3. Have a unique vehicle PIN readily available before running the routine.
4. Ignition key should be in RUN position. CAUTION: If the PCM and WIN are replaced at the same time, the PCM MUST be programmed before the WIN.
5. Select "ECU View".
6. Select "WIN Wireless Control".
7. Select "Miscellaneous Functions".
8. Select "PCM Replaced".
9. Enter the PIN when prompted.
10. Verify the correct information.
11. Cycle ignition key after the successful routine completion.

The secret key is an ID code that is unique to each WIN. This code is programmed and stored in the WIN, the PCM, and each ignition key transponder chip. When the PCM or WIN is replaced, it is necessary to program the Secret Key Code into the new module using a diagnostic scan tool. Follow the programming steps outlined in the diagnostic scan tool for PCM REPLACED , WIN REPLACED , or TIPM REPLACED under MISCELLANEOUS FUNCTIONS for the WIRELESS CONTROL MODULE menu item as appropriate.

Note. Programming the PCM or WIN is done using a diagnostic scan tool and a PIN to enter secure access mode. If three attempts are made to enter secure access mode using an incorrect PIN, secure access mode will be locked out for one hour. To exit this lockout mode, turn the ignition to the RUN position for one hour and then enter the correct PIN. Be certain that all accessories are turned OFF. Also, monitor the battery state and connect a battery charger if necessary.

Each FOBIK has a unique ID code that is assigned at the time the key is manufactured. When a key is programmed into the WIN, the module learns the transponder ID code and the transponder acquires the unique Secret Key ID code from the WIN.

Note. If you are also replacing the PCM and/or WCM/WIN, refer to the module/programming order replacement guide before starting. Refer to Standard Procedure .

1. Connect a battery charger to the vehicle.
2. Connect the scan tool.
3. Have a unique vehicle PIN readily available before running the routine.
4. Ignition key should be in RUN position.
5. Select "ECU View".
6. Select "WIN Wireless Control".
7. Select "Miscellaneous Functions".
8. Select "Program Ignition Keys or Key FOB", Start
9. Enter the PIN when prompted.
10. Verify the correct information.
11. Cycle ignition key after the successful routine completion.

Note. If the original keys do not successfully program to the new WIN after the proper procedures are followed correctly, programming new keys will be necessary.

Note. A maximum of eight keys can be learned by the WIN. Once a key is learned by a WIN, that key has acquired the Secret Key for that WIN and cannot be transferred to any other WIN or vehicle.

PROGRAMING PROCEDURE

Note. Have the vehicle PIN readily available before running the routine

1. Connect a battery charger to the vehicle.
2. With the wiTECH diagnostic application, perform the following steps

1. Select "WIRELESS CONTROL MODULE (WCM)"
2. Select the "MISCELLANEOUS FUNCTIONS" tab
3. Highlight "PROGRAMMING IGNITION KEYS OR KEY FOBS"
4. Select "NEXT"
5. Enter the PIN when prompted.
6. Select "NEXT"
7. Verify that the PIN number is correct
8. Once verified select "NEXT"
9. Note On-Screen instructions and select the "FINISH" button
10. Cycle ignition key twice after the successful routine completion.

Note. If the original keys do not successfully program to the new WCM after the proper procedures are followed correctly, programming new keys will be necessary.

Note. A maximum of eight keys can be learned by the WIN. Once a key is learned by a WIN, that key has acquired the Secret Key for that WIN and cannot be transferred to any other vehicle.

The secret key is an ID code that is unique to each WIN. This code is programmed and stored in the WIN, the PCM, and each ignition key transponder chip. When the PCM or WIN is replaced, it is necessary to program the Secret Key Code into the new module using a diagnostic scan tool. Follow the programming steps outlined in the diagnostic scan tool for PCM REPLACED , WIN REPLACED , or TIPM REPLACED under MISCELLANEOUS FUNCTIONS for the WIRELESS CONTROL MODULE menu item as appropriate.

Note. Programming the PCM or WIN is done using a diagnostic scan tool and a PIN to enter secure access mode. If three attempts are made to enter secure access mode using an incorrect PIN, secure access mode will be locked out for one hour. To exit this lockout mode, turn the ignition to the RUN position for one hour and then enter the correct PIN. Be certain that all accessories are turned OFF. Also, monitor the battery state and connect a battery charger if necessary.

Note. If you are also replacing the WCM/WIN and/or Ignition Keys/FOBIKS, refer to the module/programming order replacement guide before starting. Refer to Standard Procedure .

1. Connect a battery charger to the vehicle.
2. Connect the scan tool.
3. Have a unique vehicle PIN readily available before running the routine.
4. Ignition key should be in RUN position.
5. Select "ECU View".
6. Select "WIN Wireless Control".
7. Select "Miscellaneous Functions".
8. Select "PCM Replaced".
9. Enter the PIN when prompted.
10. Verify the correct information.
11. Cycle ignition key after the successful routine completion.

The secret key is an ID code that is unique to each WIN. This code is programmed and stored in the WIN, the PCM, and each ignition key transponder chip. When the PCM or WIN is replaced, it is necessary to program the Secret Key Code into the new module using a diagnostic scan tool. Follow the programming steps outlined in the diagnostic scan tool for PCM REPLACED , WIN REPLACED , or TIPM REPLACED under MISCELLANEOUS FUNCTIONS for the WIRELESS CONTROL MODULE menu item as appropriate.

Note. Programming the PCM or WIN is done using a diagnostic scan tool and a PIN to enter secure access mode. If three attempts are made to enter secure access mode using an incorrect PIN, secure access mode will be locked out for one hour. To exit this lockout mode, turn the ignition to the RUN position for one hour and then enter the correct PIN. Be certain that all accessories are turned OFF. Also, monitor the battery state and connect a battery charger if necessary.

Note. If you are also replacing the PCM and/or Ignition Keys/FOBIKS, refer to the module/programming order replacement guide before starting. Refer to Standard Procedure .

1. Connect a battery charger to the vehicle.
2. Connect the scan tool. NOTE: Have a unique vehicle PIN readily available before running the routine CAUTION: If the PCM and WIN are replaced at the same time, the PCM MUST be programmed before the WIN.
3. Select "ECU View".
4. Select "WIN".
5. Select "Miscellaneous Functions".
6. Select "WIN Replaced".
7. Enter the PIN when prompted.
8. Cycle ignition key after the successful routine completion.

Note. If the PCM and the WIN are replaced at the same time, all vehicle keys will need to be replaced and programmed to the new WIN.

Note. Have the vehicle PIN readily available to enter whenever prompted before running the routine.

1. Connect a battery charger to the vehicle.
2. With the wiTECH diagnostic application, perform the following steps

1. Select "WIRELESS CONTROL MODULE (WCM)"
2. Select the "MISCELLANEOUS FUNCTIONS" tab
3. Highlight "WCM REPLACED"
4. Select the "Start Misc Function" button
5. Select "NEXT"
6. Enter the PIN when prompted.
7. Select "NEXT"
8. Verify that the PIN number is correct
9. Once verified select "NEXT"
10. Select "NEXT"
11. Note On-Screen instructions and select the "FINISH" button
12. Cycle ignition key twice after the successful routine completion.

RESTORE VEHICLE CONFIGURATION

Note. The technician should have cut the KEY FOBIK Blanks using the original vehicle's Key FOBIK as a template. Please make sure the KEY FOBIK Blanks have been cut prior to programming. If this step has not been performed, please perform at this time.

Note. Prior to programming, have the vehicle PIN readily available before running the routine. If necessary, obtain the four digit PIN from the dealership's parts department.

1. When prompted, enter the four digit pin number obtained from the dealership parts department.
2. Connect a battery charger to the vehicle.
3. With the wiTECH diagnostic application, perform the following steps form the Initial Start Up Screen

1. Select the "DIAGNOSTIC PROCEDURES" tab
2. Highlight "RESTORE VEHICLE CONFIGURATION"
3. Select the "Run Diagnostic" button
4. Select "CONTINUE"
5. Verify that the vehicle VIN number is correct
6. Once verified, select the "Correct VIN" button
7. Note On-Screen instructions and select the "Close" button

UPDATE PRESSURE THRESHOLDS

Note. The wiTECH software level must be at the latest release to perform this procedure.

Note. The vehicle must be driven before the TPMS light will turn off.

Note. Have the vehicle PIN readily available before running the routine

1. Connect a battery charger to the vehicle.
2. With the wiTECH diagnostic application, perform the following steps

1. Select "WIRELESS CONTROL MODULE (WCM)"
2. Select the "MISCELLANEOUS FUNCTIONS" tab
3. Highlight and select "UPDATE PRESSURE THRESHOLDS"
4. Note On-Screen instructions and select the "NEXT" button
5. Verify current settings, select the "NEXT" button to change settings
6. Select "NEXT"
7. Enter the PIN when prompted.
8. Select "NEXT"
9. Verify that the PIN number is correct
10. Once verified, select "NEXT"
11. Select "NEXT"
12. Wait for the WCM to update it's configuration
13. Once the WCM configuration is complete, select "NEXT"
14. Note On-Screen instructions and select the "FINISH" button

POWER UP/DOWN

The DTCM will power up with an OFF/ON transition of the hard wired ignition switch input.

The DTCM will power down when the vehicle ignition switch transitions from ON to OFF, or there are no system requirements that dictate the controller to remain active

INPUTS/OUTPUTS

The following are inputs to the DTCM

1. Transfer Case Mode Sensor Signal
2. 1 Direct Battery Feed
3. Ignition RUN Sense
4. Sensor Ground
5. Module Ground
6. CAN C Bus

The following are outputs of the DTCM

1. Transfer Case Motor Brake Control
2. 5V Sensor Supply
3. Transfer Case Bi-directional Motor Control (A AND B)
4. Switched B+ Solenoid Supply
5. Transfer Case Motor Brake Control

TRANSFER CASE RANGE SELECT SWITCH INPUT (2WD, 4WD AUTO, 4WD LOCK, and 4WD LOW SELECT SWITCH)

The transfer case range select switch is hardwired directly to the Cluster (CCN). The switch position is read by the CCN and is communicated to the TIPM (Gateway) via the CAN-B bus. The TIPM then rebroadcasts this information onto the CAN-C bus where the DTCM is a receiver.

The Cluster (CCN) will support circuitry which interfaces to the system's Transfer Case Range Select Switch, including a Transfer Case Range Select Switch voltage supply and a Transfer Case Range Select Switch input. The purpose of this circuitry is to determine the mode currently being requested by the operator via the resistance ladder network in the shifter assembly, where the Transfer Case Range Select Switch is packaged.

The NEUTRAL Select Switch Input will provide the operator with the ability to place the Transfer Case in Neutral. The Transfer Case Range Switch input will provide the operator with the ability to place the transfer case in 2WD, 4WD AUTO, 4WD LOCK, and 4WD LOW. The NEUTRAL Select Switch is a momentary pushpin switch; the Transfer Case Range Select Switch is a 4-position rotary contact switch; both of these switches are provided through a resistor network for diagnostic purposes. The input will have an internal 1.0K +/- 1% pull-up resistor to 5V.

As the selected position in the switch varies and/or the NEUTRAL Switch is depressed or not, the resistance between the Cluster (CCN) voltage supply and Transfer Case Range Select Switches input will vary. Hardware, software, and calibrations within the Cluster will be provided that interpret the external resistance between the module's Transfer Case Range Select Switches voltage supply and Transfer Case Range Select Switches inputs as given in the table below

Note. There is no requirement for the DTCM to distinguish between a neutral request from the 4WD AUTO or the 4WD LOW position. Resistances in these ranges will be represented as a Neutral Switch Activation.

TRANSFER CASE MODE SENSOR SIGNAL

The Transfer Case Mode Sensor Signal Input will provide the DTCM feedback about the position of the transfer case. The mode sensor is a linear analog position sensor with a 1.4K +/- 20% potentiometer and a 1 K +/- 20% wiper resistor that converts the motor shaft position into a multiplexed voltage. The mode sensor (on the active transfer case) is an active device where the sensor's current changes as the motor shaft position changes

TRANSFER CASE BI-DIRECTIONAL MOTOR CONTROL (A AND B)

This output will control a Bi-directional DC motor that controls a clutch pack in the Transfer Case that varies the torque transfer between the front and rear axles.

Shut Down Mode

This mode is activated when the ignition switch turned to the off position. The DTCM will perform any required Shut Down tasks prior to turning off the 5V regulator.

Limp-In Mode

This mode is entered when the DTCM has detected an error condition that prevents the system from performing its required task. The DTCM operation will vary depending from modified operation to total system shut down based on the failure that has occurred.

Scheme 36

1. Disconnect and isolate the battery negative cable.
2. To gain access to the Drive Train Control Module (DTCM), position the carpet that is located at the passenger side, away from the dash panel.
3. Remove cover on the DTCM by pulling up on the upper rear tab (1), and rotating down and away from the module (3).
4. Disconnect the module electrical connectors (2).
5. Using trim stick - (special tool #C-4755, Trim Stick) or equivalent, gently pry back on the retaining tabs on the mounting plate (4) and remove module (3).

IGNITION SWITCH (KEY-ON) MODE

This is an Open Loop mode. When the fuel system is activated by the ignition switch, the following actions occur

1. The PCM pre-positions the idle air control (IAC) motor.
2. The PCM determines atmospheric air pressure from the MAP sensor input to determine basic fuel strategy.
3. The PCM monitors the engine coolant temperature sensor input. The PCM modifies fuel strategy based on this input.
4. Intake manifold air temperature sensor input is monitored.
5. Throttle position sensor (TPS) is monitored.
6. The auto shutdown (ASD) relay is energized by the PCM for approximately three seconds.
7. The fuel pump is energized through the fuel pump relay by the PCM. The fuel pump will operate for approximately three seconds unless the engine is operating or the starter motor is engaged.
8. The O2S sensor heater element is energized via the ASD or O2S heater relay. The O2S sensor input is not used by the PCM to calibrate air-fuel ratio during this mode of operation.

ENGINE START-UP MODE

This is an Open Loop mode. The following actions occur when the starter motor is engaged.

The PCM receives inputs from

1. Battery voltage
2. Engine coolant temperature sensor
3. Crankshaft position sensor
4. Intake manifold air temperature sensor
5. Manifold absolute pressure (MAP) sensor
6. Throttle position sensor (TPS)
7. Camshaft position sensor signal

The PCM monitors the crankshaft position sensor. If the PCM does not receive a crankshaft position sensor signal within 3 seconds of cranking the engine, it will shut down the fuel injection system.

The fuel pump is activated by the PCM through the fuel pump relay.

Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control the injection sequence and injector pulse width by turning the ground circuit to each individual injector on and off.

The PCM determines the proper ignition timing according to input received from the crankshaft position sensor.

ENGINE WARM-UP MODE

This is an Open Loop mode. During engine warm-up, the PCM receives inputs from

1. Battery voltage
2. Crankshaft position sensor
3. Engine coolant temperature sensor
4. Intake manifold air temperature sensor
5. Manifold absolute pressure (MAP) sensor
6. Throttle position sensor (TPS)
7. Camshaft position sensor signal
8. Park/neutral switch (gear indicator signal - auto. trans. only)
9. Air conditioning select signal (if equipped)
10. Air conditioning request signal (if equipped)

Based on these inputs the following occurs

1. Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control the injection sequence and injector pulse width by turning the ground circuit to each individual injector on and off.
2. The PCM adjusts engine idle speed through the idle air control (IAC) motor and adjusts ignition timing.
3. The PCM operates the A/C compressor clutch through the A/C compressor clutch relay. This is done if A/C has been selected by the vehicle operator and specified pressures are met at the high and low - pressure A/C switches. For additional information, refer to «Operation»(ref-457787-S41959870442012030200000) .
4. When the heating element has reached operating temperature located in the O2S, the PCM will begin monitoring O2 sensor output readings. The system will then leave the warm-up (open loop) mode and go into closed loop operation.

IDLE MODE

When the engine is at operating temperature, this is a Closed Loop mode. At idle speed, the PCM receives inputs from

1. Air conditioning select signal (if equipped)
2. Air conditioning request signal (if equipped)
3. Battery voltage
4. Crankshaft position sensor
5. Engine coolant temperature sensor
6. Intake manifold air temperature sensor
7. Manifold absolute pressure (MAP) sensor
8. Throttle position sensor (TPS)
9. Camshaft position sensor signal
10. Battery voltage
11. Park/neutral switch (gear indicator signal - auto. trans. only)
12. Oxygen sensors

Based on these inputs, the following occurs

1. Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control injection sequence and injector pulse width by turning the ground circuit to each individual injector on and off.
2. The PCM monitors the O2S sensor input and adjusts air-fuel ratio by varying injector pulse width. It also adjusts engine idle speed through the idle air control (IAC) motor.
3. The PCM adjusts ignition timing by increasing and decreasing spark advance.
4. The PCM operates the A/C compressor clutch through the A/C compressor clutch relay. This is done if A/C has been selected by the vehicle operator and specified pressures are met at the high and low - pressure A/C switches. For additional information, refer to «Operation»(ref-457787-S41959870442012030200000) .

CRUISE MODE

When the engine is at operating temperature, this is a Closed Loop mode. At cruising speed, the PCM receives inputs from

1. Air conditioning select signal (if equipped)
2. Air conditioning request signal (if equipped)
3. Battery voltage
4. Engine coolant temperature sensor
5. Crankshaft position sensor
6. Intake manifold air temperature sensor
7. Manifold absolute pressure (MAP) sensor
8. Throttle position sensor (TPS)
9. Camshaft position sensor signal
10. Park/neutral switch (gear indicator signal - auto. trans. only)
11. Oxygen (O2S) sensors

Based on these inputs, the following occurs

1. Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then adjust the injector pulse width by turning the ground circuit to each individual injector on and off.
2. The PCM monitors the O2S sensor input and adjusts air-fuel ratio. It also adjusts engine idle speed through the idle air control (IAC) motor.
3. The PCM adjusts ignition timing by turning the ground path to the coil(s) on and off.
4. The PCM operates the A/C compressor clutch through the clutch relay. This happens if A/C has been selected by the vehicle operator and requested by the A/C thermostat.

ACCELERATION MODE

This is an Open Loop mode. The PCM recognizes an abrupt increase in throttle position or MAP pressure as a demand for increased engine output and vehicle acceleration. The PCM increases injector pulse width in response to increased throttle opening.

DECELERATION MODE

When the engine is at operating temperature, this is an Open Loop mode. During hard deceleration, the PCM receives the following inputs.

1. Air conditioning select signal (if equipped)
2. Air conditioning request signal (if equipped)
3. Battery voltage
4. Engine coolant temperature sensor
5. Crankshaft position sensor
6. Intake manifold air temperature sensor
7. Manifold absolute pressure (MAP) sensor
8. Throttle position sensor (TPS)
9. Camshaft position sensor signal
10. Park/neutral switch (gear indicator signal - auto. trans. only)
11. Vehicle speed

If the vehicle is under hard deceleration with the proper rpm and closed throttle conditions, the PCM will ignore the oxygen sensor input signal. The PCM will enter a fuel cut-off strategy in which it will not supply a ground to the injectors. If a hard deceleration does not exist, the PCM will determine the proper injector pulse width and continue injection.

Based on the above inputs, the PCM will adjust engine idle speed through the idle air control (IAC) motor.

The PCM adjusts ignition timing by turning the ground path to the coil on and off.

WIDE OPEN THROTTLE MODE

This is an Open Loop mode. During wide open throttle operation, the PCM receives the following inputs.

1. Battery voltage
2. Crankshaft position sensor
3. Engine coolant temperature sensor
4. Intake manifold air temperature sensor
5. Manifold absolute pressure (MAP) sensor
6. Throttle position sensor (TPS)
7. Camshaft position sensor signal

During wide open throttle conditions, the following occurs

1. Voltage is applied to the fuel injectors with the ASD relay via the PCM. The PCM will then control the injection sequence and injector pulse width by turning the ground circuit to each individual injector on and off. The PCM ignores the oxygen sensor input signal and provides a predetermined amount of additional fuel. This is done by adjusting injector pulse width.
2. The PCM adjusts ignition timing by turning the ground path to the coil(s) on and off.

IGNITION SWITCH OFF MODE

When ignition switch is turned to OFF position, the PCM stops operating the injectors, ignition coil, ASD relay and fuel pump relay.

5 VOLT SUPPLIES

Two different Powertrain Control Module (PCM) five volt supply circuits are used; primary and secondary.

IGNITION CIRCUIT SENSE

This circuit ties the ignition switch to the Powertrain Control Module (PCM).

POWER GROUNDS

The Powertrain Control Module (PCM) has 2 main grounds. Both of these grounds are referred to as power grounds. All of the high-current, noisy, electrical devices are connected to these grounds as well as all of the sensor returns. The sensor return comes into the sensor return circuit, passes through noise suppression, and is then connected to the power ground.

The power ground is used to control ground circuits for the following PCM loads

1. Generator field winding
2. Fuel injectors
3. Ignition coil(s)
4. Certain relays/solenoids
5. Certain sensors

SENSOR RETURN

The Sensor Return circuits are internal to the Powertrain Control Module (PCM).

Sensor Return provides a low - noise ground reference for all engine control system sensors. Refer to POWER GROUNDS for more information.

Primary 5 - volt supply

1. supplies the required 5 volt power source to the Crankshaft Position (CKP) sensor.
2. supplies the required 5 volt power source to the Camshaft Position (CMP) sensor.
3. supplies a reference voltage for the Manifold Absolute Pressure (MAP) sensor.
4. supplies a reference voltage for the Throttle Position Sensor (TPS) sensor.

Secondary 5 - volt supply

1. supplies the required 5 volt power source to the oil pressure sensor.
2. supplies the required 5 volt power source for the Vehicle Speed Sensor (VSS) (if equipped).
3. supplies the 5 volt power source to the transmission pressure sensor (certain automatic transmissions).

The ignition circuit sense input tells the PCM the ignition switch has energized the ignition circuit.

Battery voltage is also supplied to the PCM through the ignition switch when the ignition is in the RUN or START position. This is referred to as the "ignition sense" circuit and is used to "wake up" the PCM. Voltage on the ignition input can be as low as 6 volts and the PCM will still function. Voltage is supplied to this circuit to power the PCM's 8-volt regulator and to allow the PCM to perform fuel, ignition and emissions control functions.

STANDARD PROCEDURE - PCM/ECM REPROGRAMMING - GAS

Refer to PCM / TCM PROGRAMMING . .

RLE AND RFE TRANSMISSIONS

The Transmission Control Module (TCM) controls all electronic operations of the transmission. The TCM receives information regarding vehicle operation from both direct and indirect inputs, and selects the operational mode of the transmission. Direct inputs are hard wired to, and used specifically by the TCM. Indirect inputs are shared with the TCM via the vehicle communication bus.

Some examples of direct inputs to the TCM are

1. Battery (B+) voltage
2. Ignition "ON" voltage
3. Transmission Control Relay (Switched B+) (if equipped)
4. Throttle Position Sensor
5. Crankshaft Position Sensor
6. Transmission Range Sensor
7. Pressure Switches
8. Transmission Temperature Sensor
9. Input Shaft Speed Sensor
10. Output Shaft Speed Sensor
11. Line Pressure Sensor

Some examples of indirect inputs to the TCM are

1. Target Idle
2. Torque Reduction Confirmation
3. Engine Coolant Temperature
4. Ambient/Battery Temperature
5. Scan Tool Communication

Based on the information received from these various inputs, the TCM determines the appropriate shift schedule and shift points, depending on the present operating conditions and driver demand. This is possible through the control of various direct and indirect outputs.

Some examples of TCM direct outputs are

1. Transmission Control Relay
2. Solenoids
3. Torque Reduction Request

Some examples of TCM indirect outputs are

1. Transmission Temperature (to PCM)
2. PRNDL Position (to cluster/CCN)

In addition to monitoring inputs and controlling outputs, the TCM has other important responsibilities and functions

1. Storing and maintaining Clutch Volume Indexes (CVI)
2. Storing and selecting appropriate Shift Schedules
3. System self-diagnostics
4. Diagnostic capabilities (with scan tool)

Note. If the TCM has been replaced, the "Quick Learn Procedure" must be performed. Refer to MODULE, Transmission Control , Standard Procedure .

BATTERY FEED

A fused, direct battery feed to the TCM is used for continuous power. This battery voltage is necessary to retain memory in the TCM. When the battery (B+) is disconnected, this memory is lost. When the battery (B+) is restored, this memory loss is detected by the TCM and a Diagnostic Trouble Code (DTC) is set.

Scheme 37

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

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

By comparing the two inputs, the TCM can determine transmission gear position. This is important to the CVI calculation because the TCM determines CVIs by monitoring how long it takes for a gear change to occur.

Gear ratios can be determined by using the 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 TCM 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 TCM 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 input clutch assembly can cause inadequate or out-of-range element volumes. Also, defective Input/Output Speed Sensors and wiring can cause these conditions. The following charts identifies the appropriate clutch volumes and when they are monitored/updated

42RLE CLUTCH VOLUMES

545RFE

SHIFT SCHEDULES

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

ASIAN AS68RC TRANSMISSION

The Transmission Control Module (TCM) controls all electronic operations of the transmission. The TCM receives information regarding vehicle operation from both direct and indirect inputs, and selects the operational mode of the transmission. Direct inputs are hard wired to, and used specifically by the TCM. Indirect inputs are shared with the TCM via the vehicle communication bus.

Some examples of direct inputs to the TCM are

1. Battery (B+) voltage
2. Ignition "ON" voltage
3. Transmission Range Sensor
4. Pressure Switches
5. Transmission Temperature Sensor
6. Input Speed Sensor
7. Output Speed Sensor

Some examples of indirect inputs to the TCM are

1. Engine/Body Identification
2. Manifold Pressure
3. Throttle position
4. Torque Reduction Confirmation
5. Engine Coolant Temperature
6. Exhaust Brake Status (if equipped)
7. PTO Request (if equipped)
8. Scan Tool Communication

Based on the information received from these various inputs, the TCM determines the appropriate shift schedule and shift points, depending on the present operating conditions and driver demand. This is possible through the control of various direct and indirect outputs.

Some examples of TCM direct outputs are

1. Exhaust Brake Cut Request (if equipped).
2. Solenoids.
3. Torque Reduction Request.

Some examples of TCM. indirect outputs are

1. Transmission Temperature (to PCM).
2. PRNDL Position (to cluster/CCN).
3. PTO Status.

In addition to monitoring inputs and controlling outputs, the TCM has other important responsibilities and functions

1. Storing and maintaining Clutch Volume Indexes (CVI).
2. Storing and selecting appropriate Shift Schedules.
3. System self-diagnostics.
4. Diagnostic capabilities (with scan tool).

Clutch filling time is continuously maintained when the vehicle is running.

TCM QUICK LEARN - AS68RC TRANSMISSION

Note. The ignition switch must be cycled to the OFF position after the AS68RC TCM quick learn procedure in order to initialize the TCM.

The quick learn procedure requires the use of the scan tool. Always check for and clear any codes after a quick learn is performed. For scan tool step by step instructions, refer to PCM/ECM/TCM PROGRAMMING for the appropriate information.

This program allows the electronic transmission system to recalibrate itself. This will provide the proper transmission operation. The quick learn procedure should be performed if any of the following procedures are performed

1. Transmission Assembly Replacement.
2. Transmission Control Module Replacement.
3. Clutch Plate and/or Seal Replacement.
4. Valve Body / Oil Pump Replacement.

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

1. Turn off any electrical loads to insure the engine is at idle speed.
2. The transmission fluid temperature must be at or above 104°F (40°C).
3. Shift the lever from NEUTRAL to DRIVE and NEUTRAL to REVERSE three to five times to bleed off trapped in the transmission clutches and brakes.
4. The shift lever position must stay in PARK until prompted to shift to another gear.
5. The parking brake must be applied and chock the rear wheels.
6. Both feet on the brake pedal.
7. PTO is inactive.

TCM QUICK LEARN - RLE AND RFE TRANSMISSIONS

The quick learn procedure requires the use of the scan tool. For scan tool step by step instructions, refer to PCM/ECM / TCM PROGRAMMING for the appropriate information.

This program allows the electronic transmission system to recalibrate itself. This will provide the proper transmission operation. The quick learn procedure should be performed if any of the following procedures are performed

1. Transmission Assembly Replacement.
2. Transmission Control Module Replacement.
3. Engine Control Module Replacement or Reprogramming.
4. Solenoid Pack Replacement.
5. Clutch Plate and/or Seal Replacement.
6. 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 in PARK until prompted to shift to overdrive.
5. The shift lever position must stay in overdrive after the Shift to Overdrive prompt until the scan tool indicates the procedure is complete.
6. The calculated oil temperature must be above 60° and below 200°.

DRIVE LEARN - RFE TRANSMISSIONS

When a transmission is repaired and a Quick Learn procedure has been performed on the Transmission Control Module (TCM), the following Drive Learn procedure can be performed to fine tune any shifts which are particularly objectionable.

Note. It is not necessary to perform the complete Drive Learn procedure every time the TCM is Quick Learned. Perform only the portions which target the objectionable shift.

LEARN A SMOOTH 1ST NEUTRAL TO DRIVE SHIFT

Perform this procedure only if the complaint is for a delayed or harsh shift the first time the transmission is put into gear after the vehicle is allowed to set with the engine not running for at least 10 minutes. Use the following steps to have the TCM learn the 1st N-D UD CVI.

Note. The transmission oil temperature must be between 80 - 110°F (27 - 43°C).

1. Start the engine only when the engine and ignition have been off for at least ten (10) minutes.
2. With the vehicle at a stop and the service brake applied, record the 1st N-D UD CVI while performing a Neutral to Drive shift. The 1st N-D UD CVI accounts for air entrapment in the UD clutch that may occur after the engine has been off for a period of time.
3. Repeat until the recorded 1st N-D UD CVI value stabilizes. Refer to step 1 and step 2 .

Note. It is important that this procedure be performed when the transmission temperature is between 80 - 110°F (27 - 43°C). If this procedure takes too long to complete fully for the allowed transmission oil temperature, the vehicle may be returned to the customer with an explanation that the shift will improve daily during normal vehicle usage. The TCM also learns at higher oil temperatures, but these values (line pressure correction values) are not available for viewing on the scan tool.

LEARN A SMOOTH NEUTRAL TO DRIVE GARAGE SHIFT

Perform this procedure if the complaint is for a delayed or harsh shift when the transmission is put into gear after the vehicle has had its first shift. Use the following steps to have the TCM learn the Norm N-D UD CVI.

Note. The transmission oil temperature must be between 80 - 110°F (27 - 43°C) to learn the UD CVI. Additional learning occurs at temperatures as low as 0°F and as high as 200°F. This procedure may be performed at any temperature that experiences poor shift quality. Although the UD CVI may not change, shift quality should improve.

1. Start the vehicle engine and shift to drive.
2. Move the vehicle forward to a speed of at least 16 km/h (10 MPH) and come to a stop. This ensures no air is present in the UD hydraulic circuit.
3. Perform repeated N-D shifts at a stop while pausing in Neutral for at least 2-3 seconds and monitor Norm N-D UD CVI volume until the value stabilizes. The value will change during the N-D shift. This is normal since the UD value is different for the N-D shift then the normal value shown which is used for 4-3 coastdown and kickdowns. Perform repeated shifts in this temperature range until the Norm N-D UD CVI value stabilizes and the N-D shifts become smooth.

LEARN THE 1ST 2-3 SHIFT AFTER A RESTART OR SHIFT TO REVERSE

Use the following steps to have the TCM learn the 1st 2-3 shift OD CVI.

Note. The transmission oil temperature must be above 80°F (27°C).

1. With the vehicle engine running, select reverse gear for over 2 seconds.
2. Shift the transmission to Drive and accelerate the vehicle from a stop at a steady 15 degree throttle opening and perform a 2-3 shift while noting the 1st 2-3 OD CVI.
3. Repeat until the 1st 2-3 upshift becomes smooth and the 1st 2-3 OD CVI stabilizes. Refer to step 1 and step 2 .

LEARN A SMOOTH 2-3 AND 3-4 UPSHIFT

Note. The transmission oil temperature must be above 110°F (43°C).

Use the following steps to have the TCM learn the OD and 4C CVI's.

1. Accelerate the vehicle from a stop at a steady 15 degree throttle opening and perform multiple 1-2, 2-3, and 3-4 upshifts. The 2nd 2-3 shift following a restart or shift to reverse will be shown during the shift as a value between the 1st 2-3 OD CVI and the normal OD CVI. Updates to the normal OD CVI will occur after the 2nd shift into 3rd gear, following a restart or shift to reverse.
2. Repeat until the 2-3 and 3-4 shifts become smooth and the OD and 4C CVI become stable. Refer to step 1 .

LEARN A SMOOTH 4-3 COASTDOWN AND PART THROTTLE 4-3 KICKDOWN

Note. The transmission oil temperature must be above 110°F (43°C).

Use the following steps to have the TCM learn the UD shift volume.

1. At a vehicle speed between 64-97 km/h (40-60 MPH), perform repeated 4-3 kickdown shifts.
2. Repeat until the UD volume becomes somewhat stable and the shift becomes smooth. Refer to 1 .

LEARN A SMOOTH 1-2 UPSHIFT AND 3-2 KICKDOWN

Use the following steps to have the TCM learn the 2C shift volume.

Note. The transmission oil temperature must be above 110°F (43°C).

1. With a vehicle speed below 48 km/h (30 MPH) and the transmission in 3rd gear, perform multiple 3-2 kickdowns.
2. Repeat until the 3-2 kickdowns become smooth and the 2C CVI becomes stable. Refer to 1 .

LEARN A SMOOTH MANUAL 2-1 PULLDOWN SHIFT AS WELL AS A NEUTRAL TO REVERSE SHIFT

Note. The transmission oil temperature must be above 110°F (43°C).

Use the following steps to have the TCM learn the LR volume.

1. With the vehicle speed around 40-48 km/h (25-30 MPH) in Manual 2nd, perform manual pulldowns to Low or 1st gear at closed throttle.
2. Repeat until the LR CVI becomes stable and the manual 2-1 becomes smooth. Refer to 1 .

LEARN A SMOOTH NEUTRAL TO REVERSE SHIFT

Note. The transmission oil temperature must be above 110°F (43°C).

1. With the vehicle at a stop, perform Neutral to Reverse shifts until the shift is smooth. An unlearned Neutral to Reverse shift may be harsh or exhibit a double bump.
2. If any of the shifts are still not smooth after the clutch volume stabilizes, an internal transmission problem may be present.

LEARN A SMOOTH 4-5 UPSHIFT

Note. The transmission oil temperature must be above 110°F (43°C).

Use the following steps to have the TCM learn the Alt 2C CVI.

1. Accelerate the vehicle through 88 km/h (55mph) at a steady 10-15 degree throttle opening and perform multiple 4-5 upshifts.
2. Repeat until the 4-5 shift become smooth and the Alt 2C CVI become stable. Refer to step 1 . There is a separate 2C volume used and learned for 4-5 shifts, 2CA. It is independent of the 2C CVI learned on 3-2 kickdowns.

Scheme 38

This vehicle is equipped with a Wireless Ignition Node (WIN). The WIN and the FOB with Integrated Key (FOBIK) are the primary components of the keyless ignition system. The only visible component of the WIN is the ignition switch located on the face of the instrument panel just to the inboard side of the steering column.

The WIN housing is constructed of molded black plastic and it includes four integral mounting bosses, which are secured to the instrument panel structure with screws. Two connector receptacles are integral to the back of the switch housing. One connects the WIN to the vehicle electrical system through a dedicated takeout and connector of the instrument panel wire harness. The other is a dedicated connector for the coaxial cable input from the optional remote start system external antenna module.

The WIN is an integrated electronic receiver that replaces the ignition switch. The WIN communicates with other electronic modules in the vehicle over the Controller Area Network (CAN) data bus.

The WIN interfaces with the Remote Keyless Entry (RKE) FOBIK and the Tire Pressure Monitor (TPM) sensors (if equipped) using Radio Frequency (RF) communication. It also communicates with the TPM trigger transponders (if equipped) and steering column lock module (if equipped) using a Local Interface Network (LIN) data bus connection.

The WIN provides a switched 12-volt source through an isolated switch for the steering column lock module required for certain export market vehicles. It also contains a key removal inhibit solenoid, an electronic Brake Transmission Shift Interlock (BTSI) solenoid, a key-in warning contact and it serves as the real time vehicle clock by transmitting the clock information to other electronic modules over the CAN data bus.

The WIN cannot be adjusted or repaired, but is flash update capable. If ineffective or damaged, the entire WIN must be replaced. When replacing the WIN, you must also replace the steering column lock module (if equipped).

IGNITION SWITCH

The Wireless Ignition Node (WIN) incorporates an integral ignition switch that consists of four rotary positions with three detent positions and one spring-loaded position. The one extreme clockwise position is a spring-loaded momentary contact "START" position. When released from the "START" position, the switch will automatically return to the detent "ON" position. The other position includes a detent "ACCESSORY" position and a detent "LOCK" position.

The WIN reads the position of the ignition switch and transmits the data via the CAN data bus. These positions include "LOCK" with ignition key-out, "LOCK" with ignition key-in, "ACCESSORY" "RUN" and "START".

SENTRY KEY IMMOBILIZER SYSTEM (SKIS)

Upon failure of proper Sentry Key Immobilizer (SKIS) communication to the Powertrain Control Module, (PCM), the PCM will not allow the vehicle to crank. The engine will not re-crank on the key cycle that the failure occurred, a full key down sequence must be performed for the engine to crank again. Refer to Operation .

REMOTE KEYLESS ENTRY (RKE)

The Remote Keyless Entry (RKE), transmitter uses Radio Frequency (RF) signals to communicate with the WIN, and the WIN relays the RKE requests to other modules in the vehicle over the CAN data bus. Refer to Operation .

TIRE PRESSURE MONITORING (TPM)

The Tire Pressure Monitoring (TPM) system uses radio and sensor technology to monitor tire air pressure levels. Refer to Tire Pressure Monitoring , Operation .

REMOTE START WITH/EXTENDED RANGE ANTENNA

For further information concerning the Remote Start, refer to Operation .

BRAKE TRANSMISSION SHIFTER INTERLOCK (BTSI)

The Brake Transmission Shifter/Ignition Interlock (BTSI) is controlled by the WIN. The BTSI prevents the transmission gear shifter from being moved out of PARK without a driver in place. For more information view the Brake Transmission Shift Interlock Mechanism for the related transmission.

PARK SHIFT INTERLOCK

The key removal inhibit solenoid internal to the WIN prevents the FOB with Integrated KEY (FOBIK) from being rotated in the ignition switch to the LOCK position for all vehicles with an automatic transmission unless the transmission shift lever is in the PARK position. The WIN module monitors a hard wired input from a switch integral to the automatic transmission shifter module to control this feature. The key removal inhibit solenoid is electronically disabled internally by the WIN on vehicles with a manual transmission.