545RFE Automatic Transmission - Electrical Diagnostics: Overview Dodge Dakota III

Theory Of Operation

Due to the integration of the Powertrain and Transmission Control Modules the New Generation Control Module III will be referred to as the Powertrain Control Module (PCM). The 3-wire TPS (4.7L V-8 Engine) provides the PCM with an input signal voltage that represents the throttle blade position of the throttle body. The Throttle Position Sensor (TPS) is connected to the throttle blade shaft. As the position of the throttle blade changes, the output voltage of the TPS changes.

The PCM supplies approximately 5.0 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range from 0.26 volts at minimum throttle opening (idle), to 4.49 volts at maximum opening (wide open throttle).

The Accelerator Pedal Position Sensor (APPS) is currently used only with the 5.7L V-8 engine. The APPS is a linear potentiometer. It provides the PCM with a voltage signal proportional to the angle, or position of the accelerator pedal. The APPS signal along with inputs from other sensors is used by the PCM to calculate the throttle plate position.

A mechanical cable is used between the accelerator pedal and the APPS assembly. Although a cable is used between the accelerator pedal and the APPS assembly, a mechanical cable is not used between the accelerator pedal and the throttle body. The throttle plate position is electronically controlled by the PCM.

Due to the integration of the Powertrain and Transmission Control Modules the New Generation Control Module III will be referred as the Powertrain Control Module (PCM). The 4.7L V-8 Throttle Positioning Sensor (TPS) provides the PCM with an input signal voltage that represents the throttle blade position of the throttle body. The TPS is connected to the throttle blade shaft. As the position of the throttle blade changes, the output voltage of the TPS changes.

The 5.7L V-8 Accelerator Pedal Position Sensor (APPS) is a linear potentiometer that provides the PCM with a voltage signal proportional to the angle, or position of the accelerator pedal. The APPS signal along with inputs from other sensors is used by the PCM to calculate the throttle plate position which is electronically controlled.

Due to the integration of the Powertrain and Transmission Control Modules the New Generation Control Module III will be referred as the Powertrain Control Module (PCM). The 4.7L V-8 Throttle Positioning Sensor (TPS) provides the PCM with an input signal voltage that represents the throttle blade position of the throttle body. The TPS is connected to the throttle blade shaft. As the position of the throttle blade changes, the output voltage of the TPS changes.

The 5.7L V-8 Accelerator Pedal Position Sensor (APPS) is a linear potentiometer that provides the PCM with a voltage signal proportional to the angle, or position of the accelerator pedal. The APPS signal along with inputs from other sensors is used by the PCM to calculate the throttle plate position which is electronically controlled.

The DTC is intended as an informational DTC to aid the technician in determining the root cause of a customer driveability issue. The DTC is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler is needed to support the customers driving behavior.

Friction element distress could result from an insufficient supply voltage to properly control the solenoids. To prevent this possibility, the battery voltage is monitored and the system is placed in logical limp-in if the battery voltage drops below the limit.

Scheme 464

Scheme 465

Scheme 466

1. 1) RELATED CHARGING SYSTEM DTC'S With the scan tool, read the Engine DTC's. Are there any related Charging System DTC's also present? Yes Refer to the Charging System category and repair any Engine Charging System DTC's, before testing DTC P0562. NOTE: After repairing the Engine Charging System DTC's, perform the Transmission Verification test to verify the transmission was not damaged. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CONDITION P0562 PRESENT NOTE: Generator, battery, and charging system must be fully functional before performing this test. With the scan tool, read Transmission DTC's. With the scan tool, Check the STARTS SINCE SET counter for P0562. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter set at 0? Yes Go To step 3) . No Go To step 7) .
3. 3) CHECKING (Z908, Z977) GROUND CIRCUITS Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool #8815. NOTE: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Using a 12-volt test light connected to 12-volts, check the PCM (Z908, Z977) Ground circuits at the appropriate terminals of Miller tool #8815. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly for the PCM (Z908, Z977) Ground circuits? Yes Go To step 4) . No Repair the (Z908, Z977) Ground circuit(s) for an open or high resistance. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) CHECKING (A104) FUSED B+ CIRCUIT Remove the Transmission Control Relay. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the (A104) Fused B+ circuit at the Transmission Control Relay connector. Does the test light illuminate brightly? Yes Go To step 5) . No Repair the (A104) Fused B+ circuit for an open or high resistance. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
5. 5) CHECKING THE (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT Turn the ignition off to the lock position. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, check all (T16) Transmission Control Relay Output circuits at the appropriate terminals of Miller tool #8815. Does the test light illuminate brightly? Yes Go To step 6) . No Repair the (T16) Transmission Control Relay Output circuit for an open or high resistance. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) TRANSMISSION CONTROL RELAY Turn the ignition off to the lock position. Reconnect all previously disconnected connectors. Install a substitute Relay in place of the Transmission Control Relay. Start the engine. Using a voltmeter, measure the vehicles battery voltage. With the scan tool, monitor the Transmission Switched Battery Voltage. Compare the scan tool Transmission Switched Battery voltage to the actual battery voltage reading on the voltmeter. Is the scan tool voltage within 1.0 volt of the battery voltage? Yes Replace the Transmission Control Relay. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
7. 7) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The controller is programmed during manufacturing with generic software to facilitate testing. This software does not have the proper calibrations to control a transmission in a vehicle. The check for generic software is made at power-up. If generic software is found , the MIL will light immediately and the MIL will stay on even if the fault is cleared, until the proper software is installed. Note: Transmission will be placed in limp-in mode.

After the controller is reset (ignition turned to the RUN position), the microprocessor checks the integrity of each RAM location by writing to it and reading back from it. The read value should be same as value written.

After the controller is reset (ignition turned to the RUN position) the microprocessor checks the integrity of the program memory (ROM). A checksum is calculated by adding all used bytes in the program memory. The sum should be the same as a known constant stored in the program memory.

The internal Watchdog (WD) is a separate hardware circuit that continuously monitors the microprocessor. To insure the proper operation of the EATX controller the watchdog must receive a signal from the microprocessor within a specific time window (14ms +/- 1ms) to prevent a system shutdown after a short delay (570ms). The microprocessor periodically tests the WD's ability to provide this shutdown function using a three phase test

1) Send the signal too late > 15ms

2) Send the signal too early < 13ms

3) Delay test < 590ms

If the watchdog input signal arrives too early or too late, the Watchdog Fault line will go low and the watchdog delay will start to time out. The delay will be reset by the correct timing of watchdog signal sent during subsequent operations.

The Delay Test checks the delay time out. The Delay Monitor line is pulled low, which forces the delay to start timing out. At the end of the delay time the Transmission Relay will be turned off. The delay test, upon detection of the relay turning off, will immediately turn the relay back on before shutdown can occur.

The T1, T2, T3, T41, or T42 (C1 - C5) Sense circuits communicate the shift lever position to the Transmission Control System. Each circuit is terminated at the transmission by a switch (TRS). Each switch can be either open or closed, depending on the shift lever position. The PCM can decode this information and determine the shift lever position.

Each shift lever position has it own unique combination of closed and open switches. This is called a PRNDL code. There are 5 switches, therefore: there are many possible combinations of open and closed switches (codes). There are 12 valid codes: two for neutral, one for each other gear position (5), and five temporary (transition zone) codes. The remainder of the codes should never occur, these are called invalid codes.

The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as a thermister. The temperature of the transmission fluid can affect a variety of electronically controlled transmission operations such as shift quality, torque converter lock-up, and when and/or if certain OBDII or system self-diagnostic test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value if a fault is detected in the Transmission Temperature Sensor circuit.

The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as a thermister. The temperature of the transmission fluid can affect a variety of electronically controlled transmission operations such as shift quality, torque converter lock-up, and when and/or if certain OBDII or system self-diagnostic test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value if a fault is detected in the Transmission Temperature Sensor circuit.

Scheme 467

1. 1) DETERMINE IF RELATED DTC'S ARE PRESENT With the scan tool, check Transmission DTC's. Are there any line pressure sensor or throttle position sensor DTCs present? Yes Refer to the Transmission category and perform the appropriate symptom. No Go To step 2) .
2. 2) CHECK TO SEE IF DTC IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0712. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 3) . No Go To step 5) .
3. 3) TRANSMISSION TEMPERATURE SENSOR Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, turn the Input/Output switch to OFF. With the scan tool, monitor the TRANS TEMP VOLTS while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator. Compare the scan tool readings with the numbers listed on the Transmission Simulator. Do the readings on the Transmission Simulator match the scan tool readings +/- 0.2 volts? Yes Replace Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM C4 harness connector and connect Miller tool #8815. NOTE: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance between ground and the (T54) Transmission Temperature Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T54) Transmission Temperature Sensor Signal circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
5. 5) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as a thermister. The temperature of the transmission fluid can affect a variety of electronically controlled transmission operations such as shift quality, torque converter lock-up, and when and/or if certain OBDII or system self-diagnostic test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value if a fault is detected in the Transmission Temperature Sensor circuit.

Scheme 468

1. 1) DETERMINE IF RELATED DTC'S ARE PRESENT With the scan tool, check Transmission DTC's. Are there any line pressure sensor or throttle position sensor DTCs present? Yes Refer to the Transmission category and perform the appropriate symptom. No Go To step 2) .
2. 2) CHECK TO SEE IF DTC IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0713. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 3) . No Go To step 5) .
3. 3) TRANSMISSION TEMPERATURE SENSOR Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Note: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, turn the Input/Output switch to OFF. With the scan tool, monitor the TRANS TEMP VOLTS while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator. Compare the scan tool readings with the numbers listed on the Transmission Simulator. Do the readings on the Transmission Simulator match the scan tool readings +/- 0.2 volts? Yes Replace Transmission Solenoid/TRS assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) (T54) TRANSMISSION SENSOR SIGNAL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T54) Transmission Temperature Sensor Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T54) Transmission Temperature Sensor Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the Transmission Temperature Sensor Signal circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
5. 5) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission Temperature Sensor is a variable resistor that changes with temperature, or otherwise known as a thermister. The temperature of the transmission fluid can affect a variety of electronically controlled transmission operations such as shift quality, torque converter lock-up, and when and/or if certain OBDII or system self-diagnostic test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value if a fault is detected in the Transmission Temperature Sensor circuit.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent which may result in the DTCs P0715 and/or P0720 to set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the signal from the input speed sensor at idle in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set when at a stop.

Scheme 469

Scheme 470

Scheme 471

Scheme 472

Scheme 473

Scheme 474

1. 1) CHECK TO SEE IF DTC P0715 IS CURRENT Start the engine in park. With the scan tool, monitor the Input Speed Sensor RPM. Is the Input Speed Sensor RPM below 400 RPM? Yes Go To step 2) . No Go To step 9) .
2. 2) INPUT SPEED SENSOR Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, set the selector switch to 3000/1000 and the Input/Output switch to ON. With the scan tool, monitor the Input and Output Speed Sensor RPM. Does the Input speed read 3000 RPM and the Output speed read 1000 RPM +/- 50 RPM? Yes Replace the Input Speed Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 3) .
3. 3) (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool #8815. NOTE: Make sure to leave the Speed Sensor, Transmission Solenoid/TRS Assembly, and Line Pressure Sensor harness connectors disconnected. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Remove the Transmission Control Relay. Place a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T52) Input Speed Sensor Signal circuit. Is the voltage above 0.5 volts? Yes Repair the (T52) Input Speed Sensor Signal circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) (T13) SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE Measure the voltage of the (T13) Speed Sensor Ground circuit. Is the voltage above 0.5 volts? Yes Repair the (T13) Speed Sensor Ground circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Measure the resistance of the (T52) Input Speed Sensor Signal circuit between the Input Speed Sensor harness connector and the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T52) Input Speed Sensor Signal circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T13) SPEED SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (T13) Speed Sensor Ground circuit between the Input Speed Sensor harness connector and the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the Input Speed Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T52) Input Speed Sensor Signal circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (T13) SPEED SENSOR GROUND CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T13) Speed Sensor Ground circuit. Is the resistance below 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
9. 9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (codes P0731 through P0736).

2) An excessive change in input or output speeds indicating signal intermittent will result in codes P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the signal from the input speed sensor at idle in neutral. Since the input speed sensor has 60 teeth and the output speed sensor has 30 teeth, this results in a an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

Scheme 475

Scheme 476

Scheme 477

1. 1) CHECK TO SEE IF DTC P0720 IS CURRENT Turn the ignition off to the lock position. CAUTION: Properly support the vehicle and raise all drive wheels off the ground. Release the parking brake. Start the engine in park. Place the transmission gear selector in drive, release foot from brake. WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS. With the scan tool, monitor the Output Speed Sensor RPM. Is the Output Speed Sensor RPM below 100 RPM? Yes Go To step 2) . No Go To step 9) .
2. 2) OUTPUT SPEED SENSOR Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, set the selector switch to 3000/1000 and the Input/Output switch to ON. With the scan tool, monitor the Input and Output Speed Sensor RPM Does the Input Speed read 3000 RPM and the Output Speed read 1000 RPM, +/- 50 RPM? Yes Replace the Output Speed Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 3) .
3. 3) (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T14) Output Speed Sensor Signal circuit from the Output Speed Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T14) Output Speed Sensor Signal circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) (T13) SPEED SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (T13) Speed Sensor Ground circuit from the Output Speed Sensor harness connector to the appropriate terminal in the Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T14) Output Speed Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T14) Output Speed Sensor Signal circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T13) SPEED SENSOR GROUND CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T13) Speed Sensor Ground circuit. Is the resistance below 5.0 ohms? Yes Repair the (T13) Speed Sensor Ground circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Remove the Transmission Control Relay. Place a jumper wire between the Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T14) Output Speed Sensor Signal circuit. Is the voltage above 0.5 volts? Yes Repair the (T14) Output Speed Sensor Signal circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (T13) SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE Measure the voltage of the (T13) Speed Sensor Ground circuit. Is the voltage above 0.5 volts? Yes Repair the (T13) Speed Sensor Ground circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
9. 9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission Control System calculates the engine RPM by directly reading the engine crank position sensor. It compares the calculated value to the engine speed sensor signal transmitted from the Engine Control System over the controllers internal bus. The calculated engine RPM is also compared to a minimum and a maximum value. Note: Due to the integration of the Powertrain Control Module (PCM) and Transmission Control Module (TCM), bus communication between the modules is internal and unserviceable.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

1. 1) DETERMINING IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's If any of these DTC's are present, perform their respective tests first. Are there any Transmission; solenoid, line pressure, speed sensor, and/or loss of prime DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. If any of these DTCs are present, they may cause a Speed Ratio Error. Perform the test for P0944 first if it is present. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK DTC EVENT DATA With the scan tool, read and record the DTC EVENT DATA. NOTE: Make sure to record all DTC EVENT DATA stored in the scan tool for future reference in this test procedure. Does the DTC EVENT DATA display information for the DTC P0734? Yes Go To step 4) . No Go To step 3) .
3. 3) CHECK FOR OTHER DTC In the DTC EVENT DATA recorded earlier, does the DTC EVENT DATA show the DTC P1790, with Target Gear = 4th, or with both the 4C and OD clutches applying? Yes Go To step 4) . No Go To step 6) .
4. 4) CHECK INPUT RPM In the DTC EVENT DATA recorded earlier, does the Input RPM read zero? Yes Refer to the Transmission category and perform the diagnostic procedure for P0715 (Input Speed Sensor Error). Diagnose the DTC as if it is set and current. No Go To step 5) .
5. 5) CHECK LINE PRESSURE READING In the DTC EVENT DATA recorded earlier, is the line pressure reading more than 10 PSI below the desired line pressure reading? Yes Remove the Transmission Oil pan and check the Transmission Oil filter for improper installation or plugged, if Primary oil filter is OK, check the main regulator valve in pump. If excessive debris is in the oil pan, check clutches and repair as necessary. Refer to the Service Information for proper repair procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) CHECK TRANSMISSION FOR SLIPPAGE Erase DTCs and road test the vehicle. Check the transmission operation in reverse and all forward gears. During the road test, was there any obvious slippage noted in 4th gear or a runaway during the 3-4 shift? Yes Go To step 8) . No Go To step 7) .
7. 7) CHECK IF DTC RESET With the scan tool, check for Transmission DTCs after the road test. Did the DTC P0734 reset? Yes Go To step 8) . No Test Complete.
8. 8) CHECK INTERNAL TRANSMISSION - Remove the Transmission Oil Pan and Valve Body per the Service Information and check for the following: - Excessive debris in the oil pan. - Remove the Valve Body and check if the accumulator cover is intact and the 4C tower seal is not cut or split. - OD and 4C accumulator pistons for cracks and/or cut seals. - Solenoid Switch Valve and its plugs for stickiness or wear. - Cut or missing #5 and/or #6 check ball. - OD bleed orifice on top of the Valve Body - Air check the OD and 4C hydraulic clutch circuits for excessive leakage. Refer to the Service information. NOTE: Both the OD and 4C hydraulic clutch circuits contain a small bleed orifice. A small amount of air leakage is considered normal. The OD hydraulic clutch circuit bleed orifice connects to the Reverse input clutch hydraulic cavity. A small amount of air leakage into the Reverse hydraulic clutch circuit is considered normal. Were there any problems found? Yes Repair as necessary. Refer to the Service Information for proper repair procedures. No Go To step 9) .
9. 9) TRANSMISSION SOLENOID/TRS ASSEMBLY Was there no reverse gear during the road test? Yes Go To step 10) . No Replace the Solenoid/TRS Assembly per the Service Information.
10. 10) CHECK ROAD TEST RESULTS During the road test, was there no 2nd gear and no 4th gear, but 3rd gear (limp-in) was OK? Yes Go To step 11) . No Go To step 12) .
11. 11) CHECK FOR BROKEN REVERSE SUN GEAR WELD Working through the windows in the bottom of the case, check for a broken Reverse Sun gear weld to the reaction carrier as follows: (1) Hold the Transmission Output Shaft by holding the Transmission Manual Lever in the park position. (2) Rotate the Input Annulus gear and drive shell, (the drum that encloses the two rearmost carriers). (3) Check to see if the reaction carrier (the frontmost carrier, whose outer shell is splined to the 2C clutch) is rotating faster than the drive shell is being turned. Is the reaction carrier turning faster than the drive shell? Yes Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the reaction carrier per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
12. 12) CHECK FOR NO REVERSE Remove the Transmission per the Service Information and inspect the weld on the reverse carrier hub. Were there any problems found? Yes Repair as necessary. Refer to the Service Information for proper repair procedures. No Disassemble and inspect the input clutch assembly. Check the OD and Reverse clutch seals, discs, and bleed orifice (in the OD/Reverse clutch piston). Check the OD hub and shaft. Repair as necessary. Refer to the Service Information for proper repair procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

1. 1) DETERMINING IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's If any of these DTC's are present, perform their respective tests first. Are there any Transmission; solenoid, line pressure, speed sensor, and/or loss of prime DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. If any of these DTCs are present, they may cause a Speed Ratio Error. Perform the test for P0944 first if it is present. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK EATX DTC EVENT DATA With the scan tool, read and record the EATX DTC EVENT DATA. NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this test procedure. Does the EATX DTC EVENT DATA display information for the DTC P0735? Yes Go To step 4) . No Go To step 3) .
3. 3) CHECK TARGET GEAR In the EATX DTC EVENT DATA recorded earlier, does the DTC EVENT DATA show the DTC P1790, with Target gear = 5th, or with both the 2C and OD clutches applying? Yes Go To step 4) . No Go To step 6) .
4. 4) CHECK INPUT RPM In the EATX DTC EVENT DATA recorded earlier, does the Input RPM read zero? Yes Refer to the Transmission category and perform the diagnostic procedure for P0715 (Input Speed Sensor Error). Diagnose the DTC as if it is set and current. No Go To step 5) .
5. 5) CHECK LINE PRESSURE READING In the EATX DTC EVENT DATA recorded earlier, is the line pressure reading more than 10 PSI below the desired line pressure reading? Yes Remove the Transmission Oil pan and check the Transmission Oil filter for improper installation or plugged, if Primary oil filter is OK, check the main regulator valve in pump. If excessive debris is in the oil pan, check clutches and repair as necessary. Refer to the Service Information for proper repair procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) CHECK TRANSMISSION FOR SLIPPAGE Erase DTCs and road test the vehicle. Check the transmission operation in reverse and all forward gears. During the road test, was there any obvious slippage noted in 5th gear or a runaway during the 4-5 shift? Yes Go To step 8) . No Go To step 7) .
7. 7) CHECK IF DTC RESET With the scan tool, check for Transmission DTCs after the road test. Did the DTC P0735 reset? Yes Go To step 8) . No Test Complete.
8. 8) CHECK INTERNAL TRANSMISSION Remove the Transmission Oil Pan and Valve Body, per the Service Information, and check for the following: - Excessive clutch and or metal debris in the oil pan. - If the accumulator cover is intact and the 2C tower seal is not cut or split. - OD and 2C accumulator pistons for cracks or cut seals. - Solenoid Switch Valve and its plugs for stickiness or wear. - Cut or missing #5, #6, or #7 check ball. - OD bleed orifice on top of the valve body. - Air check the OD and 2C hydraulic clutch circuits for excessive leakage. Refer to the Service information. NOTE: Both the OD and 2C hydraulic clutch circuits contain a small bleed orifice. A small amount of air leakage is considered normal. The OD hydraulic clutch circuit bleed orifice connects to the Reverse input clutch hydraulic cavity. A small amount of air leakage into the Reverse hydraulic clutch circuit is considered normal. Were there any problems found? Yes Repair as necessary. Refer to the Service Information for proper repair procedures. No Replace the Transmission Solenoid/TRS Assembly per the Service Information.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) Once in a particular gear, if the gear ratio varies from the correct gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent may result in the DTCs P0715 and/or P0720 being set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the pulses from the input speed sensor when at a stop in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set.

When in 2nd, 2nd Prime, 3rd, or 4th gear, the torque converter clutch (TCC) can be engaged when certain conditions are met. The TCC piston is electronically modulated by increasing the duty cycle of the LR Solenoid until the torque converter slip difference (difference between engine and transmission input speed) is within 60 RPM. Then the LR solenoid is fully energized (FEMCC / 100% duty cycle). Torque converter slip is monitored in FEMCC to ensure adequate clutch capacity.

The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Scheme 478

Scheme 479

Scheme 480

1. 1) RELATED TRANSMISSION RELAY DTC'S PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK TO SEE IF P0750 IS PRESENT Ignition on, engine not running. With the scan tool, erase all Transmission DTC's. Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, actuate the LR Solenoid. Monitor the LR Solenoid LED on the Transmission Simulator. Did the LR Solenoid LED on the Transmission Simulator blink on and off? Yes Go To step 3) . No Go To step 4) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the LR Solenoid for the period of 2 minutes with the Transmission Simulator still connected. After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did the DTC P0750 reset during the actuation test? Yes Go To step 4) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) (T20) LR SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T20) LR Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T20) LR Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T20) LR Solenoid Control circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T20) LR SOLENOID CONTROL CIRCUIT OPEN Connect Miller tool #8815 to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T20) LR Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T20) LR Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T20) LR SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T20) LR Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T20) LR Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Scheme 481

Scheme 482

Scheme 483

1. 1) RELATED TRANSMISSION RELAY DTC'S PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK TO SEE IF P0755 IS PRESENT Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, actuate the 2C Solenoid. Did the 2C Solenoid LED blink on and off on the Transmission Simulator? Yes Go To step 3) . No Go To step 4) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the 2C Solenoid for the period of 2 minutes with the Transmission Simulator still connected. After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did the DTC P0755 reset during the actuation test? Yes Go To step 4) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) (T219) 2C SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T219) 2C Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T219) 2C Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T219) 2C Solenoid Control circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T219) 2C SOLENOID CONTROL CIRCUIT OPEN Connect Miller tool #8815 to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T219) 2C Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T219) 2C Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T219) 2C SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T219) 2C Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T219) 2C Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Scheme 484

Scheme 485

Scheme 486

1. 1) RELATED TRANSMISSION RELAY DTC'S PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK TO SEE IF P0760 IS PRESENT Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, actuate the OD Solenoid. Monitor the OD Solenoid LED on the Transmission Simulator. Did the OD Solenoid LED on the Transmission Simulator blink on and off? Yes Go To step 3) . No Go To step 4) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the OD Solenoid for the period of 2 minutes with the Transmission Simulator still connected. After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did the DTC P0760 reset during the actuation test? Yes Go To step 4) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) (T60) OD SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T60) OD Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T60) OD Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T60) OD Solenoid Control circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T60) OD SOLENOID CONTROL CIRCUIT OPEN Connect Miller tool #8815 to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller special tool #8815 to perform diagnosis. Measure the resistance of the (T60) OD Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T60) OD Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T60) OD SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T60) OD Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T60) OD Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Scheme 487

Scheme 488

Scheme 489

1. 1) RELATED TRANSMISSION RELAY DTC'S PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK TO SEE IF P0765 IS PRESENT Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, actuate the UD Solenoid. Monitor the UD Solenoid LED on the Transmission Simulator. Did the UD Solenoid LED on the Transmission Simulator blink on and off? Yes Go To step 3) . No Go To step 4) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the UD Solenoid for the period of 2 minutes with the Transmission Simulator still connected. After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did the DTC P0765 reset during the actuation test? Yes Go To step 4) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) (T59) UD SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T59) UD Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T59) UD Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T59) UD Solenoid Control circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T59) UD SOLENOID CONTROL CIRCUIT OPEN Connect Miller tool #8815 to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T59) UD Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T59) UD Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T59) UD SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T59) UD Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T59) UD Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Scheme 490

Scheme 491

Scheme 492

1. 1) RELATED TRANSMISSION RELAY DTC'S PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK TO SEE IF P0770 IS PRESENT Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, actuate the 4C Solenoid. Monitor the 4C Solenoid LED on the Transmission Simulator. Did the 4C Solenoid LED on the Transmission Simulator blink on and off? Yes Go To step 3) . No Go To step 4) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the 4C Solenoid for the period of 2 minutes with the Transmission Simulator still connected. After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did the DTC P0770 reset during the actuation test? Yes Go To step 4) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) (T259) 4C SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T259) 4C Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T259) 4C Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T259) 4C Solenoid Control circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T259) 4C SOLENOID CONTROL CIRCUIT OPEN Connect Miller tool #8815 to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller special tool #8815 to perform diagnosis. Measure the resistance of the (T259) 4C Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T259) 4C Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T259) 4C SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T259) 4C Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T259) 4C Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

Scheme 493

For the Transmission circuit diagram (Refer to TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - SCHEMATICS AND DIAGRAMS) .

The Transmission system uses five pressure switches to monitor the fluid pressure in the L/R, 2C, 4C, UD, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.

Scheme 494

Scheme 495

Scheme 496

1. 1) OTHER RELATED DTC'S PRESENT Ignition on, engine not running. With the scan tool, check for other transmission DTC's. Are there any Loss of Prime and/or Transmission Control Relay related DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. If the DTC P0944 is present, perform its respective test first. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CONDITION P0841 PRESENT With the scan tool, check the EATX DTC EVENT DATA for P0841. NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this test procedure. Does the EATX DTC EVENT DATA show the DTC P0841? Yes Go To step 3) . No Refer to the Symptom Category and perform diagnostics for the DTC reported in the EATX DTC EVENT DATA.
3. 3) DTC SET IN REVERSE Does the EATX DTC EVENT DATA show the DTC P0841 set while in Reverse? Yes Go To step 10) . No Go To step 4) .
4. 4) L/R PRESSURE SWITCH CLOSED Does the EATX DTC EVENT DATA show the L/R Pressure Switch reading CLOSED when the DTC P0841 was set? Yes Go To step 5) . No Go To step 14) .
5. 5) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. Turn the Pressure Switch selector to L/R on the Transmission Simulator. With the scan tool, monitor the L/R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Did the L/R Pressure Switch state change from open to closed while pressing the Pressure Switch Test button on the Transmission Simulator? Yes Go To step 6) . No Go To step 10) .
6. 6) POOR WIRING AND CONNECTIONS Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) DTC SET IN FIRST GEAR With the EATX DTC EVENT DATA recorded earlier, check what gear the transmission was in when the DTC P0841 was set. Does the EATX DTC EVENT DATA show the Present Gear as first gear when the DTC P0841 was set ? Yes Go To step 8) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
8. 8) NO. 1 CHECK BALL CUT OR DAMAGED Turn the ignition off to the lock position. Remove the Transmission Valve Body per the Service Information. Check the No. 1 Check Ball for any possible cuts or damage. Is the No. 1 Check Ball cut or damaged? Yes Replace the No. 1 Check Ball and check for clutch debris in the transmission oil pan. If there is excessive debris, perform internal repairs to the L/R Clutch assembly. Refer to the Service Information for proper repair procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) REVERSE CARRIER SNAP RING DISLODGED OR TRANSMISSION SOLENOID/TRS ASSEMBLY Looking through the windows in the bottom of the case, check whether the snap ring at the front of the Reverse (center) Carrier has dislodged. NOTE: It may be necessary to pry the Input Annulus Gear Shell rearward to check this snap ring. Is the Reverse Carrier Snap Ring dislodged? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333 if connected in a previous step or disconnect the Transmission Solenoid /TRS Assembly harness connector. Disconnect the PCM C4 harness connector and connect Miller tool #8815. NOTE: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T50) L/R Pressure Switch Sense circuit from the Solenoid/TRS Assembly harness connector to the appropriate terminal of the Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T50) L/R Pressure Switch Sense circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 11) .
11. 11) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T50) L/R Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T50) L/R Pressure Switch Sense circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 12) .
12. 12) PCM POWERS AND GROUNDS Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 13) .
13. 13) ROAD TEST THE VEHICLE With the scan tool, clear the DTC and road test the vehicle. Try to duplicate the conditions in which the DTC originally set using the EATX DTC EVENT DATA recorded earlier. Did the DTC P0841 reset? Yes Replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 17) .
14. 14) LOW LINE PRESSURE In the EATX DTC EVENT DATA recorded earlier, compare the Line Pressure and the Desired Line Pressure. Is the Line Pressure less than 40 psi, and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check for low fluid level. Check the Primary Oil Filter seal for a split, crack, or improperly installed. Refer to the Service Information for the proper installation procedure. If the fluid level and Primary Oil Filter are OK, check the Main Regulator Valve in the Oil Pump per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 15) .
15. 15) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect all PCM harness connectors. Measure the resistance between the (T50) L/R Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T50) L/R Pressure Switch Sense circuit and all other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T50) L/R Pressure Switch Sense circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 16) .
16. 16) ROAD TEST THE VEHICLE With the scan tool, clear the DTC and road test the vehicle. Try to duplicate the conditions in which the DTC originally set using the EATX DTC EVENT DATA recorded earlier. Did the DTC P0841 reset? Yes Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 17) .
17. 17) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission Control System tests the pressure switches when they are off. The test verifies that the switches are operational (They will close with pressure applied). The Transmission Control System verifies that the switch closes when the corresponding element is applied. If a switch fails to close, it is re-tested. If it fails the second test, the DTC will set, the MIL will illuminate and the transmission system will default to the orderly Shutdown routine.

Scheme 497

Scheme 498

Scheme 499

Scheme 500

Scheme 501

1. 1) DETERMINING IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's Is there any Loss of Prime, Transmission Control Relay, and/or Line Pressure Sensor DTCs present? Yes Refer to the Transmission category and perform the appropriate symptom. If the DTC, P0944-LOSS OF PRIME is present, perform its respective test first. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) DTC P0755 PRESENT With the scan tool, check Transmission DTCs. Is the DTC P0755 also present? Yes Refer to the symptom list and perform diagnostics for P0755-2C SOLENOID CIRCUIT. No Go To step 3) .
3. 3) DTCS P0732, P0735 AND/OR P0846 PRESENT With the scan tool, check for other transmission DTC's Are the DTCs P0732, P0735, and/or P0846 present also? Yes Go To step 12) . No Go To step 4) .
4. 4) CHECK TO SEE IF DTC P0845 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0845. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 5) . No Go To step 17) .
5. 5) LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least 5 seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 PSI in each position? Yes Go To step 6) . No Go To step 10) .
6. 6) CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa or 30 PSI when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) LINE PRESSURE SENSOR OPERATION Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition on, engine not running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the 3 line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and +/-14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition off to the lock position. Connect the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500, and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500, and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500, and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings +/- 10 psi? Yes Go To step 11) . No Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
11. 11) WIRING AND CONNECTORS Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Remove the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Install the Transmission Simulator, Miller tool #8333. On the Transmission Simulator, turn the Pressure Switch selector switch to 2C. Ignition on, engine not running. With the scan tool, monitor the 2C Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the 2C Pressure Switch. Did the 2C Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To step 12) . No Go To step 14) .
12. 12) CHECK FOR EXCESSIVE DEBRIS Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Remove and inspect the Transmission Oil Pan per the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Refer to the Service Information for the proper procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 13) .
13. 13) CHECK THE 2C HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the 2C clutch hydraulic circuit, in the 2C/4C clutch retainer, for leakage per the Service Information. NOTE: The 2C hydraulic clutch circuit contains a small bleed orifice, a small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the 2C clutch piston, piston seals and bleed orifice assembly. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the 2C Accumulator piston and seals. Check for an extra check ball downstream from the #7 check ball pocket and repair as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
14. 14) CHECK THE (T147) 2C PRESSURE SWITCH SENSE CIRCUIT FOR AN OPEN Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Measure the resistance of the (T147) 2C Pressure Switch Sense circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T147) 2C Pressure Switch Sense circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 15) .
15. 15) CHECK THE (T147) 2C PRESSURE SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T147) 2C Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T147) 2C Pressure Switch Sense circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 16) .
16. 16) (T147) 2C PRESSURE SWITCH SENSE CIRCUIT SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between the (T147) 2C Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T147) 2C Pressure Switch Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T147) 2C Pressure Switch Sense circuit for a short to another circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
17. 17) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. If the EATX DTC EVENT DATA shows the DTC P0845 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.

Line pressure is measured by the Line Pressure Sensor (LPS) and regulation is achieved by changing the duty cycle of the Pressure Control Solenoid (PCS) controlled by the Transmission Control System. (5% duty cycle = solenoid off = max line pressure, 62% duty cycle = solenoid on = min line pressure). The Transmission Control System calculates the desired line pressure based on inputs from both the engine and transmission.

The Transmission Control System calculates torque input to the transmission and uses it as the primary input to the desired line pressure calculation. This is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level 827 or 931kPa (120 or 135 PSI) during shifts and in Park and Neutral to ensure consistent shift quality. The desired line pressure is continuously being compared to the actual line pressure. If the actual line pressure is consistently lower than the target while driving, the line pressure low DTC P0868 will set.

Scheme 502

Scheme 503

1. 1) CHECK FOR RELATED DTC'S With the scan tool, check for other transmission DTC's Is the DTC P0932 present also? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CONDITION P0868 PRESENT With the scan tool, check the STARTS SINCE SET counter for P0868. NOTE: This counter only applies to the last DTC set. Is the START SINCE SET COUNTER 2 or less? Yes Go To step 3) . No Go To step 11) .
3. 3) CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Line Pressure, firmly push the Line Pressure Sensor harness connector towards the Transmission. Did the Line Pressure change to about 207 kPa or 30 PSI when the connector was pushed? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, monitor the Line Pressure during the following steps. Using the Transmission Simulator, set the rotary knob to each of the 3 line pressure positions. NOTE: All three scan tool Line Pressure readings should be steady and +/-14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator. Did the Line Pressure read within +/-14 kPa or 2.0 PSI in all three positions? Yes Go To step 5) . No Go To step 7) .
5. 5) LINE PRESSURE SENSOR Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333 and reconnect all previously disconnected connectors. Install the Line Pressure Adaptor, Miller tool #8259, and the Pressure Gauge, Miller tool #C-3293, 0 to 2000 kPa or 0 to 300 PSI. Start the engine in park. Monitor the line pressure readings of both the scan tool and the pressure gauge and compare the two readings. Is the line pressure gauge reading within 34 kPa or 5 PSI of the scan tool reading? Yes Go To step 6) . No Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) PLUGGED TRANSMISSION OIL FILTER Turn the ignition off to the lock position. Remove and inspect the Transmission Oil Pan for excessive debris per the Service Information. Remove and inspect the Primary Oil Filter per the Service Information. NOTE: Make sure the Primary Transmission Oil Filter and/or O-ring is not cracked or split. Does the Oil Pan contain excessive debris and/or is the Primary Oil Filter cracked or plugged? Yes Repair the plugged, cracked, or split Primary Transmission Oil Filter and/or O-ring. If the Primary Transmission Oil Filter is plugged refer to the Service Information for the proper Hydraulic repair procedure. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Repair internal transmission and inspect the Transmission Oil Pump per the Service Information and replace if necessary. If no problem is found, replace the Solenoid/TRS Assembly. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
7. 7) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO VOLTAGE Disconnect the Transmission Simulator, Miller tool #8333. Reconnect all previously disconnected connectors except the Line Pressure Sensor harness connector. Ignition on, engine not running. Measure the voltage of the (F856) 5-volt Supply circuit in the Line Pressure Sensor harness connector. Is the voltage above 5.5 volts? Yes Repair the (F856) 5-volt Supply circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C1 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 10) .
10. 10) (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT SHORT TO ANOTHER CIRCUIT Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect all PCM harness connectors. Measure the resistance between the (T140) Pressure Control Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T140) Pressure Control Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T140) Pressure Control Solenoid Control circuit for a short to another circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
11. 11) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

Line pressure is measured by the Line Pressure Sensor (LPS) and regulation is achieved by changing the duty cycle of the Pressure Control Solenoid (PCS) controlled by the Transmission Control System. (5% duty cycle = solenoid off = max line pressure, 62% duty cycle = solenoid on = min line pressure). The Transmission Control System calculates the desired line pressure based on inputs from both the engine and transmission.

The Transmission Control System calculates torque input to the transmission and uses it as the primary input to the desired line pressure calculation. This is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level 827 or 931kPa (120 or 135 PSI) during shifts and in Park and Neutral to ensure consistent shift quality. The desired line pressure is continuously being compared to the actual line pressure. If the actual line pressure is consistently higher than the highest desired line pressure ever used in the current gear, the line pressure high DTC P0869 will set.

Scheme 504

Scheme 505

1. 1) CHECK FOR RELATED DTC'S With the scan tool, check for other Transmission DTC's Is the DTC P0932 or P0888 present also? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CONDITION P0869 PRESENT With the scan tool, check the STARTS SINCE SET counter for P0869. Is the DTC P0932 or P0888 present also? Yes Go To step 3) . No Go To step 10) .
3. 3) CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Transmission Line Pressure. Firmly push the Line Pressure Sensor harness connector inward towards the Transmission. Did the Line Pressure change to about 207 kPa or 30 PSI when the sensor connector was pushed? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, monitor the Line Pressure during the following step. Using the Transmission Simulator, set the rotary switch to each of the 3 line pressure positions. NOTE: All three scan tool Line Pressure readings should be steady and +/-14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator. Did the Line Pressure read within +/-14 kPA or 2.0 PSI in all three positions? Yes Go To step 5) . No Go To step 6) .
5. 5) CHECK LINE PRESSURE SENSOR CALIBRATION Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333 and reconnect all previously disconnected connectors. Install the Line Pressure Adaptor, Miller tool #8259, and Pressure Gauge, Miller tool #C-3293, 0 to 2000 kPa or 0 to 300 PSI. Start the engine in park. Monitor the Line Pressure readings on the scan tool and the pressure gauge. Compare the Line Pressure readings between the scan tool and the pressure gauge. Is the pressure gauge reading within 34 kPa or 5 PSI of the scan tool reading? Yes Repair the internal transmission and inspect the Transmission Oil Pump per the Service Information and replace if necessary. If no problem is found, replace the Transmission Solenoid/TRS Assembly, possible cause is a stuck Pressure Control Solenoid. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the Line Pressure Sensor per the Service information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the Powertrain Control Module C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T140) Pressure Control Solenoid Control circuit from the appropriate terminal of Miller tool #8815 to the Solenoid/TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T140) Pressure Control Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T140) Pressure Control Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T140) Pressure Control Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Disconnect the PCM C1 harness connector. Disconnect the Line Pressure Sensor harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the Powertrain Control Module per the Service Information. With the scan tool perform the QUICK LEARN procedure. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission Control System tests the pressure switches when they are off. The test verifies that the switches are operational (They will close with pressure applied). The Transmission Control System verifies that the switch closes when the corresponding element is applied. If a switch fails to close, it is re-tested. If it fails the second test, the DTC will set, the MIL will illuminate and the transmission system will default to the orderly Shutdown routine.

Scheme 506

Scheme 507

Scheme 508

1. 1) DETERMINING IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's Is there any Loss of Prime, Transmission Control Relay, and/or Line Pressure Sensor DTCs present? Yes Refer to the Transmission category and perform the appropriate symptom. If the DTC, P0944-LOSS OF PRIME is present, perform its respective test first. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) DTC P0760 PRESENT With the scan tool, check Transmission DTCs. Is the DTC P0760 also present? Yes Refer to the symptom list and perform diagnostics for P0760-OD SOLENOID CIRCUIT. No Go To step 3) .
3. 3) OTHER DTCS PRESENT With the scan tool, check for other transmission DTC's Are any of the DTCs, P0733, P0734 ,P0735 and/or P0871 present also? Yes Go To step 12) . No Go To step 4) .
4. 4) CHECK TO SEE IF DTC P0870 IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0870. Is the STARTS SINCE SET COUNTER 2 or less? Yes Go To step 5) . No Go To step 17) .
5. 5) LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least 5 seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 PSI in each position? Yes Go To step 6) . No Go To step 10) .
6. 6) CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa or 30 PSI when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) LINE PRESSURE SENSOR OPERATION Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition on, engine not running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the 3 line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and +/-14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect Transmission Simulator. Disconnect the PCM C4 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition off to the lock position. Connect the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500, and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500, and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500, and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings +/- 10 psi? Yes Go To step 11) . No Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
11. 11) WIRING AND CONNECTORS Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Remove the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Install the Transmission Simulator, Miller tool #8333. On the Transmission Simulator, turn the Pressure Switch selector switch to OD. Ignition on, engine not running. With the scan tool, monitor the OD Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the OD Pressure Switch. Did the OD Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To step 12) . No Go To step 14) .
12. 12) CHECK FOR EXCESSIVE DEBRIS Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Remove and inspect the Transmission Oil Pan per the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Refer to the Service Information for the proper procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 13) .
13. 13) CHECK OD HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the OD hydraulic clutch circuit (in the case) for leakage per the Service Information. NOTE: The OD hydraulic clutch circuit contains a small bleed orifice which connects to the Reverse hydraulic clutch circuit. A small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the OD/Rev clutch piston seals, bleed orifice assembly, reaction shaft support seal rings, and machining of the main mating faces on the pump housing, pump valve body, and reaction shaft support. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the OD Accumulator piston and seals. Check for an extra check ball downstream from the #6 check ball pocket and repair as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
14. 14) (T9) OD PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Measure the resistance of the (T9) OD Pressure Switch Sense circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T9) OD Pressure Switch Sense circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 15) .
15. 15) (T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T9) OD Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T9) OD Pressure Switch Sense circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 16) .
16. 16) (T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between the (T9) OD Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T9) OD Pressure Switch Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T9) OD Pressure Switch Sense circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
17. 17) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. If the EATX DTC EVENT DATA shows the DTC P0870 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.

The Transmission Control System tests the pressure switches when they are off. The test verifies that the switches are operational (They will close with pressure applied). The Transmission Control System verifies that the switch closes when the corresponding element is applied. If a switch fails to close, it is re-tested. If it fails the second test, the DTC will set, the MIL will illuminate and the transmission system will default to the orderly Shutdown routine.

Scheme 509

Scheme 510

Scheme 511

1. 1) DETERMINING IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's Is there any Loss of Prime, Transmission Control Relay, and/or Line Pressure Sensor DTCs present? Yes Refer to the Transmission category and perform the appropriate symptom. If the DTC, P0944-LOSS OF PRIME is present, perform its respective test first. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) DTC P0765 PRESENT With the scan tool, check Transmission DTCs. Is the DTC P0765 also present? Yes Refer to the symptom list and perform diagnostics for P0765-UD SOLENOID CIRCUIT. No Go To step 3) .
3. 3) OTHER DTCS PRESENT With the scan tool, check for other transmission DTC's Are any of the DTCs, P0731, P0732, P0733, P0876, and/or P1736 present also? Yes Go To step 12) . No Go To step 4) .
4. 4) CHECK TO SEE IF DTC P0875 IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0875. Is the STARTS SINCE SET COUNTER 2 or less? Yes Go To step 5) . No Go To step 17) .
5. 5) LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least 5 seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 PSI in each position? Yes Go To step 6) . No Go To step 10) .
6. 6) CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa or 30 PSI when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) LINE PRESSURE SENSOR OPERATION Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition on, engine not running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the 3 line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and +/-14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition off to the lock position. Connect the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500, and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500, and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500, and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings +/- 10 psi? Yes Go To step 11) . No Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
11. 11) WIRING AND CONNECTORS Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Remove the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Install the Transmission Simulator, Miller tool #8333. On the Transmission Simulator, turn the Pressure Switch selector switch to UD. Ignition on, engine not running. With the scan tool, monitor the UD Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the UD Pressure Switch. Did the UD Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To step 12) . No Go To step 14) .
12. 12) CHECK FOR EXCESSIVE DEBRIS Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Remove and inspect the Transmission Oil Pan per the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Refer to the Service Information for the proper procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 13) .
13. 13) CHECK UD HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the UD hydraulic clutch circuit (in the case) for leakage per the Service Information. NOTE: The UD hydraulic clutch circuit contains a small bleed orifice. A small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the UD clutch piston, piston seals and bleed orifice, reaction shaft support seal rings, and machining of the main mating faces of the pump housing, pump valve body, and reaction shaft support. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the UD Accumulator piston and seals. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
14. 14) (T29) UD PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Measure the resistance of the (T29) UD Pressure Switch Sense circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T29) UD Pressure Switch Sense circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 15) .
15. 15) (T29) UD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T29) UD Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T29) UD Pressure Switch Sense circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 16) .
16. 16) (T29) UD PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between the (T29) UD Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T29) UD Pressure Switch Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T29) UD Pressure Switch Sense circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
17. 17) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. If the EATX DTC EVENT DATA shows the DTC P0875 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.

Scheme 512

1. 1) CHECK IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay, Line Pressure, and/or Loss of Prime DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. If a Loss of Prime DTC is present, perform its respective test first. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK FOR PRESSURE SWITCH DTCS Are there two or more other pressure switch rationality DTC's present in addition to P0876? Yes Go To step 3) . No Go To step 4) .
3. 3) CHECK IF ALL PRESSURE SWITCHES READ CLOSED With the scan tool, read and record all EATX DTC EVENT DATA. NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this test procedure. Does the EATX DTC EVENT DATA show all pressure switches reading CLOSED? Yes Refer to the symptom category and perform diagnostics for P0888. Diagnose the symptom as if the DTC is current. No Go To step 4) .
4. 4) CHECK FOR OTHER DTCS With the scan tool, check for other transmission DTC's. Is the DTC P2704 present also? Yes Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) CHECK EATX DTC EVENT DATA With the scan tool, read and record the DTC EVENT DATA. NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this test procedure. Does the DTC EVENT DATA display information for the DTC P0876? Yes Go To step 6) . No Refer to the symptom list and perform diagnostics for the DTC listed in the EATX DTC EVENT DATA. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) CHECK IF DTC EVENT DATA WAS SET IN PARK, NEUTRAL OR REVERSE Refer to the DTC EVENT DATA recorded earlier. Did the DTC P0876 set in Park, Neutral, or Reverse? Yes Go To step 10) . No Go To step 7) .
7. 7) CHECK FOR UD PRESSURE SWITCH STATUS Refer to the DTC EVENT DATA recorded earlier. Did the DTC P0876 set with the UD Pressure Switch closed? Yes Go To step 10) . No Go To step 8) .
8. 8) CHECK LINE PRESSURE In the EATX DTC EVENT DATA recorded earlier, compare the Line Pressure and the Desired Line Pressure. Is the Line Pressure less than 40 PSI, and significantly below the Desired Line Pressure? Yes Repair as necessary to correct low line pressure. Check fluid level and adjust as necessary. If fluid level is OK, check the Primary Oil Filter seal for a split, crack, or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (T29) UD PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Measure the resistance between the (T29) UD Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T29) UD Pressure Switch Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T29) UD Pressure Switch Sense circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, turn the Pressure Switch selector switch to the UD position. With the scan tool, monitor the UD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Did the state of the UD Pressure Switch change while pressing the Pressure Switch Test button? Yes Go To step 14) . No Go To step 11) .
11. 11) (T29) UD PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM C4 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (T29) UD Pressure Switch Sense circuit from the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the special tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T29) UD Pressure Switch Sense circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 12) .
12. 12) (T29) UD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T29) UD Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T29) UD Pressure Switch Sense circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 13) .
13. 13) (T29) UD PRESSURE SWITCH SENSE CIRCUIT SHORT TO ANOTHER CIRCUIT Disconnect all PCM harness connectors. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. Measure the resistance between the (T29) UD Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T29) UD Pressure Switch Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T29) UD Pressure Switch Sense circuit for a short to another circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
14. 14) WIGGLE TEST WITH SIMULATOR Perform the steps in the previous test while wiggling the wiring harness and connectors pertaining to the UD Pressure Switch. Did the state of the UD Pressure Switch change while pressing the Pressure Switch Test button? Yes Repair the wiring harness and/or connectors as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 15) .
15. 15) CHECK FOR TRANSMISSION SOLENOID/TRS ASSEMBLY FOR A SHORT TO GROUND Disconnect the Transmission Simulator and reconnect the Transmission Solenoid/TRS Assembly harness connector. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Measure the resistance between ground and the (T29) UD Pressure Switch Sense circuit in the appropriate terminal of Miller tool #8815. Is the resistance below 5.0 ohms? Yes Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 16) .
16. 16) CHECK IF DTC RESETS Reconnect all previously disconnected connectors. With the scan tool, erase all transmission DTCs. Test drive the vehicle. Using the EATX DTC EVENT DATA recorded earlier, try to duplicate the conditions in which the DTC originally set. Does the DTC P0876 reset? Yes Go To step 17) . No Go To step 18) .
17. 17) CHECK FOR CUT NO. 2 CHECK BALL Remove the Valve Body per the Service Information. Check the No. 2 check ball for cuts or damage. Is the No. 2 check ball cut or damaged? Yes Replace the No. 2 check ball. Check for excessive clutch debris in the oil pan. If excessive debris is present, check the UD Clutch and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Check for excessive clutch debris in the oil pan. If excessive debris is present, check the UD Clutch and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
18. 18) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

If a vehicle loses power to the Transmission Control System, the solenoids (LR, 2C, OD, UD, 4C) will go to their respective power off state. Some solenoids are normally vented and some are normally applied in their power off state. The transmission is designed to be in 3rd gear with all of the solenoids in this state. However, if power is restored, the Transmission Control System will power-up and normal operation will be restored.

This code identifies that power to the Transmission Control System was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 32 km/h (20 MPH). This DTC does not indicate a problem with the transmission or Transmission Control System, instead, it suggests intermittent problems in the fused ignition switch output, fused B(+), or ground circuits to the TCM. Alternately, if a person performs a rolling restart maneuver, the DTC can be set. Therefore it is critical that this DTC be investigated if the vehicle is experiencing intermittent 3rd gear operation and a subsequent return to normal operation.

The transmission control relay is used to supply power to the solenoids and pressure switches when the transmission is in normal operating mode. The relay output is fed back to the TCM through pins 16, 17, and 36. It is referred to as "Transmission Control Relay Output". This circuit does not supply power to the TCM, it is only a sense circuit. When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in "limp-in" or "default" mode. Note: Inadequate Transmission Control Relay Output voltage can also cause DTCs P0846, P0869, P0871, P0876 or P0988 to set. This does not indicate an internal transmission or solenoid/TRS problem. Repairing the P0888 fault should also eliminate the related DTCs.

Scheme 513

Scheme 514

Scheme 515

Scheme 516

1. 1) CHECK TO SEE IF DTC P0888 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0888. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter equal to 0? Yes Go To step 2) . No Go To step 9) .
2. 2) (A104) FUSED B+ CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the (A104) Fused B+ circuit in the Transmission Control Relay connector. NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Go To step 3) . No Repair the (A104) Fused B+ circuit for an open. If the fuse is open make sure to check for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
3. 3) (Z915) TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN Turn the ignition off to the lock position. Using a 12-volt test light connected to 12-volts, check the (Z915) Transmission Control Relay Ground circuit in the Transmission Control Relay connector. Does the test light illuminate brightly? Yes Repair the (Z915) Transmission Control Relay Ground circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) TRANSMISSION CONTROL RELAY Install a substitute relay in place of the Transmission Control Relay. Start the vehicle. With the scan tool, check transmission DTCs. Did the DTC P0888 reset? Yes Replace the Transmission Control Relay. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Disconnect the Transmission Solenoid/TRS Assembly harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Connect a jumper wire between the (A104) Fused B+ circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, check all four (T16) Transmission Control Relay Output circuits in the PCM C4 harness connector and Transmission Solenoid/TRS Assembly harness connector. Does the test light illuminate brightly on all four (T16) Transmission Control Relay Output circuits? Yes Go To step 6) . No Repair the (T16) Transmission Control Relay Output circuit(s) for an open or high resistance. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) (T16) TRANSMISSION RELAY OUTPUT CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Measure the resistance between ground and the (T16) Transmission Control Relay Output circuit. Is the resistance below 5.0 ohms? Yes Repair the (T16) Transmission Control Relay Output circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T15) Transmission Control Relay Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T15) Transmission Control Relay Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN Measure the resistance of the (T15) Transmission Control Relay Control circuit between the Transmission Control Relay connector and the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T15) Transmission Control Relay Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
9. 9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission control relay is used to supply power to the solenoids and pressure switches (Transmission Solenoid/TRS Assembly) when the transmission is in normal operating mode. When the relay is off, no power is supplied and the transmission is in "limp-in" mode. The relay output is fed back to the PCM through pins C4-19, C4-28 and C4-38 and are referred to as "Transmission Control Relay Output".

Immediately after a controller reset (ignition key turned to the "run" position or after cranking engine), the TCM verifies that the relay contacts are open by checking for no voltage at the transmission control relay output terminals. After this is verified, the voltage at the pressure switches are checked. There should be no voltage on the pressure switches at this time. The PCM will then activate the relay.

Scheme 517

1. 1) CHECK TO SEE IF DTC P0890 IS PRESENT With the scan tool, Check the STARTS SINCE SET counter for P0890. NOTE: This counter only applies to the last DTC set. Is the "Starts Since Set" counter set at 0? Yes Go To step 2) . No Go To step 4) .
2. 2) PRESSURE SWITCH SENSE CIRCUITS SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Disconnect the Transmission Solenoid/TRS Assembly harness connector. Remove the Transmission Control Relay. NOTE: Note: Check connectors - Clean/repair as necessary. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Connect a jumper wire between the Fused B+ circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T147) 2C, (T48) 4C, (T50) LR, (T9) OD, and (T29) UD Pressure Switch Sense circuits in Miller tool #8815. Is the voltage above 0.5 volt on any of the measured circuits? Yes Repair the (T147) 2C, (T48) 4C, (T50) LR, (T9) OD, and/or (T29) UD Pressure Switch Sense circuit(s) for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 3) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY Turn the ignition off. Remove the jumper wire. NOTE: Do not reinstall the Transmission Relay. Reconnect the Transmission Solenoid/TRS Assembly harness connector. Ignition on, engine not running. Measure the voltage of the (T147) 2C, (T48) 4C, (T50) LR, (T9) OD, and (T29) UD Pressure Switch Sense circuits in Miller tool #8815. Is the voltage above 0.5 volts on any of the sense circuits? Yes Replace the Transmission Solenoid/TRS Assembly. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission Control Relay is used to supply power (Transmission Control Relay Output) to the Transmission Solenoid/TRS Assembly when in normal operating mode and to pins C4-19, C4-28 and C4-38 of the PCM. The purpose of the Transmission Control Relay is to allow the PCM to turn off the power to the Transmission Solenoid/TRS Assembly in event that the transmission should need to be placed into "limp-in" mode due to a DTC.

After a PCM reset, (ignition switch turned to the run position, or after cranking engine) the PCM verifies that the Transmission Control Relay contacts are open by checking for voltage on the Transmission Control Relay Output circuit before the Transmission Control Relay is energized. If voltage is detected, the DTC will set.

Scheme 518

Scheme 519

Scheme 520

1. 1) CHECK TO SEE IF DTC P0891 IS CURRENT With the scan tool, check the STARTS SINCE SET counter. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter set to 0? Yes Go To step 2) . No Go To step 6) .
2. 2) TRANSMISSION CONTROL RELAY Turn the ignition off to the lock position. Disconnect the Transmission Control Relay. NOTE: Note: Check connectors - Clean/repair as necessary. Measure the resistance between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output Circuit of the Transmission Control Relay. Is the resistance above 5.0 ohms? Yes Go To step 3) . No Replace the Transmission Control Relay. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
3. 3) (T16) TRANSMISSION RELAY OUTPUT CIRCUIT SHORT TO VOLTAGE Ignition on, engine not running. Measure the voltage at the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Is the voltage above 0.5 volts? Yes Go To step 4) . No Go To step 5) .
4. 4) TRANSMISSION SOLENOID/TRS ASSEMBLY Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. Measure the voltage at the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Is the voltage above 0.5 volts? Yes Repair the (T16) Transmission Control Relay Output circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
5. 5) (T15)TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Disconnect the Transmission Solenoid/TRS Assembly harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Connect a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T15) Transmission Control Relay Control circuit. Is the voltage above 0.5 volts? Yes Repair the (T15) Transmission Control Relay Control circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

Line pressure is electronically controlled by the Transmission Control System and is measured by the Line Pressure Sensor (LPS). The desired line pressure is continuously being compared to the actual line pressure and is regulated by electronically changing the duty cycle of the Pressure Control Solenoid (PCS). (5% duty cycle = solenoid off = max line pressure, 62% duty cycle = solenoid on = min line pressure).

The Transmission Control System calculates the desired line pressure based on inputs from the transmission and engine. A calculated torque input to the transmission is used as the primary input of the desired line pressure calculation and is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level 827 to 931kPa (120 to 135 PSI) during shifts and in Park and Neutral to ensure consistent shift quality.

Line pressure is electronically controlled by the Transmission Control System and is measured by the Line Pressure Sensor (LPS). The desired line pressure is continuously being compared to the actual line pressure and is regulated by electronically changing the duty cycle of the Pressure Control Solenoid (PCS). (5% duty cycle = solenoid off = max line pressure, 62% duty cycle = solenoid on = min line pressure).

The Transmission Control System calculates the desired line pressure based on inputs from the transmission and engine. A calculated torque input to the transmission is used as the primary input of the desired line pressure calculation and is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level 827 to 931 kPa (120 to 135 PSI) during shifts and in Park and Neutral to ensure consistent shift quality.

The monitored Line Pressure Sensor voltage should always be between 0.35 and 4.75 volts. Any monitored voltages outside these parameters indicate an Line Pressure Sensor or wiring problem and will cause either DTC P0934 or P0935 to set.

Scheme 521

1. 1) CHECK TO SEE IF DTC IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0934. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 2) . No Go To step 6) .
2. 2) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. Ignition on, engine not running. With the scan tool, under Transmission Sensors, monitor the Line Pressure. Using the Transmission Simulator, set the rotary switch to each of the 3 line pressure positions. NOTE: The readings should be within +/-14 kPa or 2.0 PSI on the scan tool to the pressure readings specified on Transmission Simulator. Does the Line Pressure on the scan tool match the line pressures on the Transmission Simulator? Yes Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 3) .
3. 3) (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector and connect Miller tool #8815. Disconnect the Transmission Simulator, Miller tool #8333. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance between ground and the (T38) Line Pressure Sensor Signal circuit. Is the resistance below 5.0 ohms? Yes Repair the (T38) Line Pressure Sensor Signal circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Disconnect the PCM C1 harness connector and connect Miller tool #8815. Measure the resistance of the (F856) 5-volt Supply circuit between Line Pressure sensor harness connector and the appropriate terminal of Miller tool #8815. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Disconnect the PCM C1 harness connector and connect Miller tool #8815. Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

Line pressure is electronically controlled by the Transmission Control System and is measured by the Line Pressure Sensor (LPS). The desired line pressure is continuously being compared to the actual line pressure and is regulated by electronically changing the duty cycle of the Pressure Control Solenoid (PCS). (5% duty cycle = solenoid off = max line pressure, 62% duty cycle = solenoid on = min line pressure).

The Transmission Control System calculates the desired line pressure based on inputs from the transmission and engine. A calculated torque input to the transmission is used as the primary input of the desired line pressure calculation and is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level 827 to 931 kPa (120 to 135 PSI) during shifts and in Park and Neutral to ensure consistent shift quality.

The monitored Line Pressure Sensor voltage should always be between 0.35 and 4.75 volts. Any monitored voltages outside these parameters indicate an Line Pressure Sensor or wiring problem and will cause either DTC P0934 or P0935 to set.

Scheme 522

Scheme 523

Scheme 524

1. 1) CHECK TO SEE IF DTC IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0935. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 2) . No Go To step 6) .
2. 2) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, monitor the Line Pressure. Using the Transmission Simulator, set the rotary switch to each of the 3 line pressure positions. NOTE: The readings should be within +/-14 kPa or 2.0 PSI on the scan tool of the pressure reading specified on Transmission Simulator. Does the 3 line pressures on the scan tool match the Line pressure readings on the Transmission Simulator? Yes Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 3) .
3. 3) (K900) SENSOR GROUND CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM C2 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (K900) Sensor Ground circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (K900) Sensor Ground circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 4) .
4. 4) (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT OPEN Disconnect the PCM C4 harness connector and connect Miller tool #8815. Measure the resistance of the (T38) Line Pressure Sensor Signal circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T38) Line Pressure Sensor Signal circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Remove the Transmission Control Relay. Connect a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T38) Line Pressure Sensor Signal circuit. Is the voltage above 5.5 volts? Yes Repair the (T38) Line Pressure Sensor Signal circuit for a short to voltage. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
6. 6) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Loss of prime test is used to prevent transmission defaults and erroneous fault codes during temporary loss of pump prime that may occur with low transmission fluid under severe braking conditions, start-up, etc. and to point towards more subtle problems such as a plugged or cracked oil filter.

The Loss of Prime DTC is set by a loss of hydraulic pressure in the transmission system. This condition, if sustained, will result in the vehicle being unable to move.

The Transmission Control System tests the pressure switches when they are off. The test verifies that the switches are operational (They will close with pressure applied). The Transmission Control System verifies that the switch closes when the corresponding element is applied. If a switch fails to close, it is re-tested. If it fails the second test, the DTC will set, the MIL will illuminate and the transmission system will default to the orderly Shutdown routine.

Scheme 525

Scheme 526

Scheme 527

1. 1) DETERMINING IF RELATED DTC'S ARE PRESENT With the scan tool, check for other transmission DTC's Is there any Loss of Prime, Transmission Control Relay, and/or Line Pressure Sensor DTCs present? Yes Refer to the Transmission category and perform the appropriate symptom. If the DTC P0944 is present, perform its respective test first. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) DTC P0770 PRESENT With the scan tool, check Transmission DTCs. Is the DTC P0770 also present? Yes Refer to the symptom list and perform diagnostics for P0770. No Go To step 3) .
3. 3) OTHER DTCS PRESENT With the scan tool, check for other transmission DTC's Are the DTCs P0988 and/or P1736 present also? Yes Go To step 12) . No Go To step 4) .
4. 4) CHECK TO SEE IF DTC P0987 IS CURRENT With the scan tool, check if the DTC P0987-4C HYDRAULIC PRESSURE TEST FAILURE is active or stored. Is the DTC P0987-4C HYDRAULIC PRESSURE TEST FAILURE active? Yes Go To step 5) . No Go To step 17) .
5. 5) LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least 5 seconds in each range. Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 PSI in each position? Yes Go To step 6) . No Go To step 10) .
6. 6) CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission. Did the Line Pressure reading on the scan tool change to about 207 kPa or 30 PSI when the connector was pushed inward? Yes Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 7) .
7. 7) LINE PRESSURE SENSOR OPERATION Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch. Ignition on, engine not running. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the 3 line pressure positions on the Transmission Simulator. NOTE: All three scan tool Line Pressure readings should be steady and +/-14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator. Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions? Yes Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 8) .
8. 8) (F856) 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect Transmission Simulator. Disconnect the PCM C1 harness connector and connect Miller tool #8815. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis. Measure the resistance of the (F856) 5-volt Supply circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 9) .
9. 9) (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply circuit. Is the resistance below 5.0 ohms? Yes Repair the (F856) 5-volt Supply circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
10. 10) COMPARE SCAN TOOL TO PRESSURE GAUGE Turn the ignition off to the lock position. Connect the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Refer to the Service Information for proper installation procedure. CAUTION: Apply parking brake. Start the engine. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear. CAUTION: Do not overheat transmission. With the gear selector in park, raise the RPM to 1500, and compare line pressure readings. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500, and compare the line pressure readings. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500, and compare the line pressure readings. Does the scan tool Line Pressure readings match the Pressure Gauge readings +/- 10 psi? Yes Go To step 11) . No Replace the Line Pressure Sensor per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
11. 11) WIRING AND CONNECTORS Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Remove the Line Pressure Adapter, Miller tool #8259 and 0-300 psi Test Gauge, Miller tool #C-3293-SP. Install the Transmission Simulator, Miller tool #8333. On the Transmission Simulator, turn the Pressure Switch selector switch to 4C. Ignition on, engine not running. With the scan tool, monitor the 4C Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the 4C Pressure Switch. Did the 4C Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To step 12) . No Go To step 14) .
12. 12) CHECK FOR EXCESSIVE DEBRIS Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333. Remove and inspect the Transmission Oil Pan per the Service Information. Does the Transmission Oil Pan contain excessive debris or contamination? Yes Repair the cause of the excessive debris in the Transmission Oil Pan. Refer to the Service Information for the proper procedures. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 13) .
13. 13) CHECK 4C HYDRAULIC CLUTCH CIRCUIT Remove the Valve Body and air check the 4C hydraulic clutch circuit (in the case) for leakage per the Service Information. NOTE: The 4C hydraulic clutch circuit contains a small bleed orifice. A small amount of air leakage is normal. Was there excessive air leakage noticed during the air check? Yes Repair as necessary. Check the 4C clutch piston, piston seals and bleed orifice assembly. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Disassemble and inspect the Valve Body and repair as necessary. Inspect the 4C Accumulator piston and seals. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
14. 14) (T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Simulator, Miller tool #8333 and connect Miller tool #8815. Disconnect the PCM C4 harness connector. Measure the resistance of the (T48) 4C Pressure Switch Sense circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T48) 4C Pressure Switch Sense circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 15) .
15. 15) (T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T48) 4C Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T48) 4C Pressure Switch Sense circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 16) .
16. 16) (T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHER CIRCUITS Disconnect all PCM harness connectors. Disconnect the Transmission Solenoid/TRS Assembly harness connector. NOTE: Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between the (T48) 4C Pressure Switch Sense circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T48) 4C Pressure Switch Sense circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T48) 4C Pressure Switch Sense circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
17. 17) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. If the EATX DTC EVENT DATA shows the DTC P0987 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring. Where there any problems found? Yes Repair as necessary. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Test Complete.

The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown.

The PCM uses a battery backed RAM (Random Access Memory) is used to maintain some learned values. When the battery B(+) is disconnected, the memory is lost. When the B(+) is restored, this memory loss is detected by the Transmission Control System. The DTC is set and the learned values are initialized to known constants or previously learned values from EEPROM (Electronic Erasable Programmable Read Only Memory). This results in the reinitialization of some parameters.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent which may result in the DTCs P0715 and/or P0720 to set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the signal from the input speed sensor at idle in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set when at a stop.

The Solenoid Switch Valve (SSV) controls the direction of the transmission fluid when the L/R Solenoid is energized. The SSV will be in the downshifted position in 1st gear, thus directing the fluid to the L/R clutch circuit. In 2nd through 5th gears, it will be in the upshifted position and directing the fluid into the torque converter clutch (TCC).

When shifting into 1st gear, a special hydraulic sequence is performed to ensure SSV movement into the downshifted position. The L/R Pressure Switch is monitored to confirm SSV movement. If movement is not confirmed (the L/R pressure switch does not close), EMCC is inhibited until SSV operation is confirmed.

The Solenoid Switch Valve (SSV) controls the direction of the transmission fluid when the L/R Solenoid is energized. The SSV will be in the downshifted position in 1st gear, thus directing the fluid to the L/R clutch circuit. In 2nd through 5th gears, it will be in the upshifted position and directing the fluid into the torque converter clutch (TCC).

When in 2nd, 2nd Prime, 3rd, 4th, or 5th gear, the Torque Converter Clutch (TCC) can be engaged when certain conditions are met. The TCC piston is electronically modulated by increasing the duty cycle of the L/R solenoid until the torque converter slip difference (difference between engine and transmission input speed) is within 60 RPM. Then the L/R solenoid is fully energized (FEMCC / 100% duty cycle). Torque converter slip is monitored in FEMCC to ensure adequate clutch capacity.

This DTC will only be stored along with a gear ratio DTC. If this DTC is set, it indicates a probable hydraulic (line pressure) or mechanical problem exists. Diagnosing the transmission should be based on the associated speed ratio DTC and mechanical causes should be considered first.

The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks

1) When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (DTCs P0731-36).

2) An excessive change in input or output speeds indicating signal intermittent which may result in the DTCs P0715 and/or P0720 to set.

3) If the common speed sensor ground circuit is lost, both sensor inputs will read the signal from the input speed sensor at idle in neutral. Since the input speed sensor reads 60 teeth from the input clutch hub and the output speed sensor reads 30 teeth from the park gear, the result is an apparent speed ratio of 1:2 and may cause the DTC P1794 to set when at a stop.

The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTC's, which indicates an internal transmission problem.

The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTC's, which indicates an internal transmission problem.

The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTC's, which indicates an internal transmission problem.

The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTC's, which indicates an internal transmission problem.

The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTC's, which indicates an internal transmission problem.

The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC. Note: This DTC is strictly an electrical fault and does not apply to any internal transmission failures.

Scheme 528

Scheme 529

Scheme 530

1. 1) RELATED TRANSMISSION RELAY DTC'S PRESENT With the scan tool, check for other transmission DTC's. Are there any Transmission Control Relay DTC's present? Yes Refer to the Transmission category and perform the appropriate symptom. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 2) .
2. 2) CHECK THE WIRING AND CONNECTORS Turn the ignition off to the lock position. Remove the Starter Relay. NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install Transmission Simulator, Miller tool #8333. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the scan tool, actuate the MS Solenoid. Monitor the MS Solenoid LED on the Transmission Simulator. Did the MS Solenoid LED on the Transmission Simulator blink on and off? Yes Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 3) .
3. 3) TRANSMISSION SOLENOID/TRS ASSEMBLY With the scan tool, continue to actuate the MS Solenoid for the period of 2 minutes with the Transmission Simulator still connected. After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs. Did the DTC P2706 reset during the actuation test? Yes Go To step 4) . No Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .
4. 4) (T118) MS SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333. Disconnect the PCM harness connectors. Measure the resistance between the (T118) MS Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector. Is the resistance below 5.0 ohms between the (T118) MS Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector? Yes Repair the (T118) MS Solenoid Control circuit for a short to other circuit(s). Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 5) .
5. 5) (T118) MS SOLENOID CONTROL CIRCUIT OPEN Connect Miller tool #8815 to the PCM C4 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller special tool #8815 to perform diagnosis. Measure the resistance of the (T118) MS Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T118) MS Solenoid Control circuit for an open. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Go To step 6) .
6. 6) (T118) MS SOLENOID CONTROL CIRCUIT SHORT TO GROUND Measure the resistance between ground and the (T118) MS Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T118) MS Solenoid Control circuit for a short to ground. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) . No Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN. Perform «45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1»(ref-247638-S13671592912007020100000) .

Scheme 531

For the Transmission circuit diagram (Refer to TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - SCHEMATICS AND DIAGRAMS) .

Some NGC controllers communicate with other controllers over the CAN C bus. The transmission controller continuously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller, therefor if the Engine Controller is unable to communicate with the Transmission Controller, the Engine Controller will light the MIL.

Communication over the CAN bus is continuously monitored between the Engine Control System and the Transmission Control System. Due to the integration of both systems into one module, (Powertrain Control Module) the bus communication between the systems is internally transmitted over the duel port ram.

Some NGC controllers communicate with other controllers over the CAN C bus. The transmission controller continuously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller, therefor if the Engine Controller is unable to communicate with the Transmission Controller, the Engine Controller will light the MIL.

Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS .

Some NGC controllers communicate with other controllers over the CAN C bus. The transmission controller continuously monitors the bus activity and receives the messages it needs. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller, therefor if the Engine Controller is unable to communicate with the Transmission Controller, the Engine Controller will light the MIL.