42RLE Automatic Transmission - Electrical Diagnostics: Overview

Theory Of Operation

The powertrain controller receives the throttle position signal from the Throttle Position Sensor (TPS) / Accelerator Pedal Position (APP). The controller provides the TPS/APP with a 5 volt pull up and a sensor ground. The signal is checked for being out of range as well as for intermittent operation (excessive signal changes). The engine controller transmits the throttle value onto the Bus. Most engine controllers will calculate the throttle value if the throttle signal is lost. If an error is detected by the transmission controller and the throttle value is available on the Bus, the Bus value will be used, normal operation will continue, and a TPS/APP code will be set. If an error is detected and the throttle value is not available on the Bus, normal operation will be discontinued, a TPS/APP DTC will be set, and the MIL will be turned on after 5 minutes of calculated operation.

The powertrain controller receives the throttle position signal from the Throttle Position Sensor (TPS) / Accelerator Pedal Position (APP). The controller provides the TPS with a 5 volt pull up and a sensor ground. The signal is checked for being out of range as well as for intermittent operation (excessive signal changes). The engine controller transmits the throttle value onto the Bus. Most engine controllers will calculate the throttle value if the throttle signal is lost. If an error is detected by the transmission controller and the throttle value is available on the Bus, the Bus value will be used, normal operation will continue, and a TPS/APP code will be set. If an error is detected and the throttle value is not available on the Bus, normal operation will be discontinued, a TPS/APP DTC will be set, and the MIL will be turned on after 5 minutes of calculated operation.

If the transmission oil temperature rises above 115° C (240° F), the overheat shift schedule is activated refer to Transmission Operation as a function of Transmission Oil Temperature and the code is set. The DTC is an informational code only and is being set to aid the technician in determining root cause of a customer driveability issue. The code 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 should be added to the vehicle if the customer regularly drives in a manner that overheats the transmission. Extended operation above 115° C (240° F) will reduce the durability of the transmission and should be avoided. Correcting the cooling system malfunction or installing an additional transmission oil cooler will improve transmission durability especially for customers who operate in city/construction stop and go traffic, tow trailers regularly, drive aggressively in low gear or drive regularly in mountainous areas.

Transmission damage may occur if there is 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 72

Scheme 72: Diagnostic Test

Scheme 73

Scheme 74

1) RELATED CHARGING SYSTEM DTC'S With the scan tool, read the Engine DTC's. Are there any Charging System related DTCs also present? Yes Refer to the «CHARGING»(ref-255999) and repair any PCM Charging System DTCs, before proceeding. NOTE: After repairing the PCM Charging System DTCs, perform the Transmission Verification test to verify the transmission was not damaged. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 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) CHECKING (Z904) GROUND CIRCUIT Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. 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 (Z904) Ground circuits in 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 all the Ground circuits? Yes Go To step 4) . No Repair the Ground circuit and/or circuits for an open or high resistance. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
4) CHECKING (INTERNAL) FUSED B(+) CIRCUIT Turn the ignition off to the lock position. Remove the Transmission Control Relay. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the (internal) 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 5) . No Repair the Fused B(+) circuit for an open or high resistance. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) CHECKING THE (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between (INTERNAL) Fused B(+) circuit and the (T16) Transmission Control Relay Output circuit. Ignition on, engine not running. Using a 12-volt test light connected to ground, check all (T16) Transmission Control Relay Output circuits in 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? Yes Go To step 6) . No Repair the (T16) Transmission Control Relay Output circuit(s) for an open or high resistance. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) TRANSMISSION CONTROL RELAY Turn the ignition off to the lock position. Install a substitute Relay in place of the Transmission Control Relay. Start the engine. Using a voltmeter, measure the 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. Is the scan tool voltage within 2.0 volts of the battery voltage? Yes Replace the Transmission Control Relay. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
7) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorts and open circuits. With the scan tool, check the DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, the microprocessor checks the integrity of each RAM location by writing to it and reading back from it. The read value should be the same as the written value. MIL on after 10 seconds of vehicle operation and transmission will be placed in limp-in.

After the controller is reset, 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 memory. MIL on after 10 seconds of vehicle operation and transmission will be placed in limp-in.

The internal watchdog is a separate hardware circuit which continuously monitors the microprocessor. To make sure the transmission is operating properly, the watchdog must receive a signal from the microprocessor within a specific time window. MIL on after 10 seconds of vehicle operation and transmission will be placed in limp-in.

The C1 through C4 (T1, T3, T41, and T42) sense circuits communicate the shift lever position to the PCM. Each circuit is terminated at the transmission with a switch. 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 a certain combination of switches, which will be open and closed, this is called a PRNDL code. There are 4 switches, therefore: there are many possible combinations of open and closed switches (codes). However, there are only 9 valid codes (8 for AutoStick), one for each gear position and three recognized between gear codes. The remainder of the codes should never occur, these are called invalid codes. The following chart shows the normal switch states for each shift lever position.

SLP	T42	T41	T3	T1
P	CL	CL	CL	OP
R	CL	OP	OP	OP
N	CL	CL	OP	CL
OD	OP	OP	OP	CL
3	OP	OP	CL	OP
L	CL	OP	CL	CL

TRS SWITCH STATES

Scheme 75

Scheme 75: Diagnostic Test

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

1) CHECK IF THE DTC P0706 IS CURRENT With the scan tool, erase Transmission DTCs. Cycle the ignition off, then start the vehicle. Firmly apply the brakes and shift into Overdrive. NOTE: Vehicle must remain in Overdrive for at least three seconds. With the brakes firmly applied, shift slowly through all gears (PRNDL) as least three times, pausing momentarily in each gear. NOTE: If all the PRNDL lights box individually then the error was cleared. Shift into park and turn the ignition off to the lock position. Ignition on, engine not running. With the scan tool, read Transmission DTCs. Does the DTC P0706 reset, or do all the PRNDL indicators remain boxed in park or neutral? Yes Go To step 2) . No Go To step 18) .
2) CHECK SHIFTER OPERATION With the scan tool, perform the Shift Lever Position Test. Select the test outcome from the following: Test passes Go To step 18) . Test fails with error code Go To step 3) . Test fails without error code Go To step 17) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. Ignition on, engine not running. With the scan tool, perform the Shift Lever Position Test. When the scan tool instructs you to put the Gear Selector in a particular position, you must do so using the Transmission Simulator. The LED for the gear position in question must be illuminated on the Transmission Simulator, prior to pressing the ENTER key on the scan tool. NOTE: After completion of this procedure, make sure to disconnect the Transmission Simulator, Miller tool #8333 and Electronic Transmission adapter cable kit, Miller tool #8333-1A and reconnect all connectors. Did the Shift Lever Position Test pass? Yes Replace the Transmission Range Sensor per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 4) .
4) IDENTIFY FAULTY CIRCUIT Reconnect all disconnected connectors. Turn the ignition on, engine not running. With the scan tool, monitor the TRS Sense circuits on the Input/Output screen - C1 through C4. Move the shift lever through all gear positions, pausing momentarily in each gear position and watch for one of the circuits to not change state. Pick the one that did not change state. TRS (T1)sense (C4) Go To step 5) . TRS (T3)sense (C3) Go To step 8) . TRS (T41)sense (C1) Go To step 11) . TRS (T42)sense (C2) Go To step 14) .
5) TRS (T1) SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. 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 TRS (T1) Sense circuit from the appropriate terminal of special tool #8815 to the TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the TRS (T1) Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) TRS (T1) SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the TRS (T1) Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the TRS (T1) Sense circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) TRS (T1) SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay from the PDC. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 TRS (T1) Sense circuit at the appropriate terminal of special tool #8815. Is the voltage above 0.5 volt? Yes Repair the TRS (T1) Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) TRS (T3) SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. 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 TRS (T3) Sense circuit from the appropriate terminal of special tool #8815 to the TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the TRS (T3) Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 9) .
9) TRS (T3) SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the TRS (T3) Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the TRS (T3) Sense circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 10) .
10) TRS (T3) SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 TRS (T3) Sense circuit. Is the voltage above 0.5 volt? Yes Repair the TRS (T3) Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
11) TRS (T41) SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C3 harness connector. 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 TRS (T41) Sense circuit from the appropriate terminal of special tool #8815 to the TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the TRS (T41) Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 12) .
12) TRS (T41) SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C3 harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the TRS (T41) Sense circuit Is the resistance below 5.0 ohms? Yes Repair the TRS (T41) Sense circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 13) .
13) TRS (T41) SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C3 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 TRS (T41) Sense circuit. Is the voltage above 0.5 volt? Yes Repair the TRS (T1) Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
14) TRS (T42) SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. 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 TRS (T42) Sense circuit from the appropriate terminal of special tool #8815 to the TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the TRS (T42) Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 15) .
15) TRS (T42) SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the TRS (T42) Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the TRS (T42) Sense circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 16) .
16) TRS (T42) SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the TRS harness connector. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 TRS (T42) Sense circuit. Is the voltage above 0.5 volt? Yes Repair the TRS (T42) Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
17) CHECK AND ADJUST SHIFTER View repair. Repair Adjust the Shift Linkage and/or cable per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
18) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. Check the Shift Linkage and cable for proper operation per the Service Information. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Perform *PRNDL FAULT CLEARING PROCEDURE after completion of any repairs. Were there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 87

Scheme 87: Circuit Schematic

The temperature sensor is used to sense the temperature of the transmission fluid. Transmission fluid temperature can affect shift quality, torque converter operation and when or if some diagnostics are run. A failed temperature sensor could affect the OBD diagnostics. If a problem occurs in the transmission temperature sensor circuit, transmission temperature will be based on a calculated value.

Scheme 88

Scheme 88: Diagnostic Test

1) DETERMINE IF RELATED DTC'S ARE PRESENT With the scan tool, check Transmission DTC's. Are there any Speed Sensor DTCs present? Yes Perform appropriate DTC test(s) in this article. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 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 6) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. 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 Go To step 4) . No Go To step 5) .
4) TRANSMISSION TEMPERATURE SENSOR View repair. Repair Replace Transmission Solenoid/TRS Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the TRS harness connector. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
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. Were there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 89

Scheme 89: Theory Of Operation

Scheme 90

Scheme 91

1) 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 2) . No Go To step 7) .
2) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. 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 Go To step 3) . No Go To step 4) .
3) TRANSMISSION TEMPERATURE SENSOR If there are no possible causes remaining, view repair. Repair Replace TRS Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
4) (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the TRS harness connector 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 Transmission Temperature Sensor Signal circuit from the appropriate terminal of special tool #8815 to the TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the Transmission Temperature Sensor Signal circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (K900) SENSOR GROUND CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the TRS harness connector Disconnect the PCM C2 harness connector NOTE: Check connectors - Clean/repair as necessary. Measure the resistance of the (K900) Sensor Ground circuit from the appropriate terminal of special tool #8815 to the TRS harness connector. Is the resistance above 5.0 ohms? Yes Repair the (K900) Sensor Ground circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 (T54) Transmission Temperature Sensor Signal circuit in the appropriate terminal of special tool #8815. Is the voltage above 0.5 volts? Yes Repair the Transmission Temperature Sensor Signal circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
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. Were there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

1) CHECK TO SEE IF DTC IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0714. 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 4) .
2) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. 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 a non-fluctuating scan tool reading +/- 0.2 volts? Yes Go To step 3) . 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
3) TRANSMISSION TEMPERATURE SENSOR View repair. Repair Replace TRS Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
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. Were there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 92

Scheme 92: Circuit Schematic

Scheme 93

Scheme 93: Diagnostic Test

Scheme 94

Scheme 95

Scheme 96

Scheme 97

1) CHECK TO SEE IF DTC P0715 IS CURRENT Start the engine. Place the shifter in park. With the scan tool, read the Input Speed Sensor RPM. Is the Input Speed Sensor reading below 400 RPM? Yes Go To step 2) . No Go To step 9) .
2) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. Ignition on, engine not running. With the Transmission Simulator, set the "Input/Output Speed" switch to "ON" and the rotary switch to the "3000/1250" position. With the scan tool, read the Input and Output RPM. Does the Input speed read 3000 RPM and the Output speed read 1250 RPM +/- 50 RPM? Yes Go To step 3) . No Go To step 4) .
3) INPUT SPEED SENSOR View repair. Repair Replace the Input Speed Sensor per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
4) (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Input Speed Sensor harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T52) Input Speed Sensor Signal circuit from the appropriate terminal of special tool #8815 to the Input Speed Sensor connector. Is the resistance above 5.0 ohms? Yes Repair the (T52) Input Speed Sensor Signal circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (T13) SENSOR GROUND CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Input Speed Sensor harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance of the (T13) Sensor Ground circuit from the from the appropriate terminal of special tool #8815 to the Input Speed Sensor harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T13) Sensor Ground circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Input Speed Sensor harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the (T52) 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T52) INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Output Speed Sensor harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and (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 volt? Yes Repair the (T52) Input Speed Sensor Signal circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) (T13) SENSOR GROUND CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ and (T16) Transmission Control Relay Output circuits in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T13) Sensor Ground circuit. Is the voltage above 0.5 volts? Yes Repair the (T13) Sensor Ground circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 98

Scheme 98: Diagnostic Test

Scheme 99

Scheme 100

Scheme 101

Scheme 102

1) CHECK TO SEE IF DTC P0720 IS CURRENT Start the engine in park. Raise the drive wheels off of the ground. WARNING: Properly support the vehicle. Firmly apply the brakes and place the transmission selector in drive. WARNING: Be sure to keep hands and feet clear of rotating wheels. Release the brakes and allow the drive wheels to spin freely. NOTE: The drive wheels must be turning at this point. With the scan tool, read the Output RPM Is the Output RPM below 100? Yes Go To step 2) . No Go To step 9) .
2) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. Ignition on, engine not running. With the Transmission Simulator, set the "Input/Output Speed" switch to "ON" and the rotary switch to the "3000/1250" position. With the scan tool, read the Input and Output RPM. Does the Input RPM read 3000 and the Output RPM read 1250 (within 50 RPM)? Yes Go To step 3) . No Go To step 4) .
3) OUTPUT SPEED SENSOR If there are no possible causes remaining, view repair. Repair Replace the Output Speed Sensor per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
4) (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Output Speed Sensor harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T14) Output Speed Sensor Signal circuit from appropriate terminal of special tool #8815 to the Output Speed Sensor harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T14) Output Speed Sensor Signal circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (T13) SENSOR GROUND CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Output Speed Sensor harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance of the Sensor Ground circuit from the appropriate terminal of special tool #8815 to the Output Speed Sensor harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T13) Sensor Ground circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Output Speed Sensor harness connector. NOTE: Check connectors - Clean/repair as necessary. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Output Speed Sensor harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and (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 volt? Yes Repair the (T14) Output Speed Sensor Signal circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) (T13) SENSOR GROUND CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ and (T16) Transmission Control Relay Output circuits in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T13) Sensor Ground circuit. Is the voltage above 0.5 volts? Yes Repair the (T13) Sensor Ground circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

The PCM uses a dual port RAM internal to the controller to send the engine speed signal to the Transmission Control System. The calculated engine RPM is compared to a minimum and maximum value. If the PCM interprets this signal to be out of range when the engine is running the code is set. The MIL illuminates after 10 seconds of vehicle operation and the transmission system defaults to Limp-in mode.

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 data checks. When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding gear ratio error trouble code is set. The transmission will go into Limp-in mode after four gear ratio error events occur in a given driving cycle.

When in 2nd, 3rd, or 4th gear, the torque converter clutch (TCC) can be locked or partially locked when certain conditions are met. The TCC piston is electronically modulated by increasing the duty cycle of the LR/TCC solenoid until the torque converter slip difference (difference between engine and turbine speed) is within 60 RPM. Then the LR/TCC solenoid is fully energized (FEMCC / 100% duty cycle). Torque converter slip is monitored in FEMCC to ensure adequate clutch capacity. The transmission will attempt normal EMCC operation (not in Limp-in) even after the MIL is illuminated. MIL will illuminate after 5 minutes of accumulated slip in FEMCC.

Four solenoids are used to control the friction elements (clutches). The continuity of the solenoids circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the PCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a gear ratio or pressure switch error occurs. In this case, one failure will result in the appropriate DTC being set. The MIL will illuminate and the transmission goes into neutral, if the DTC is set above 35 Km/h (22 MPH), Limp-in mode when vehicle speed is below 35 Km/h (22 MPH).

Scheme 103

Scheme 103: Diagnostic Test

Scheme 104

Scheme 105

1) DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read Transmission DTCs. Are there any TCM Power Input DTCs present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK TO SEE IF P0750 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 for P0750 set at 0? Yes Go To step 3) . No Go To step 8) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. Ignition on, engine not running. With the scan tool, actuate the L/R Solenoid. Monitor the L/R Solenoid LED on the Transmission Simulator. Did the L/R Solenoid LED on the Transmission Simulator blink on and off during actuation? Yes Go To step 7) . No Go To step 4) .
4) (T20) LR SOLENOID CONTROL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T20) LR Solenoid Control circuit from the appropriate terminal of special tool #8815 to the Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T20) LR Solenoid Control circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (T20) LR SOLENOID CONTROL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T20) LR SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 (T20) LR Solenoid Control circuit. Is the voltage above 0.5 volts? Yes Repair the (T20) LR Solenoid Control circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
7) LR SOLENOID/PRESSURE SWITCH ASSEMBLY View repair. Repair Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 106

Scheme 106: Diagnostic Test

Scheme 107

Scheme 108

1) DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read Transmission DTCs. Are there any TCM Power Input DTCs present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK TO SEE IF P0755 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 for P0755 set at 0? Yes Go To step 3) . No Go To step 8) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. Ignition on, engine not running. With the scan tool, actuate the 2/4 Solenoid. Monitor the 2/4 Solenoid LED on the Transmission Simulator. Did the 2/4 Solenoid LED on the Transmission Simulator blink on and off during actuation? Yes Go To step 7) . No Go To step 4) .
4) (T19) 2/4 SOLENOID CONTROL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T19) 2/4 Solenoid Control circuit from the appropriate terminal of special tool #8815 to the Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T19) 2/4 Solenoid Control circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (T19) 2/4 SOLENOID CONTROL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Measure the resistance between ground and the (T19) 2/4 Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T19) 2/4 Solenoid Control circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T19) 2/4 SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 (T19) 2/4 Solenoid Control circuit. Is the voltage above 0.5 volts? Yes Repair the (T19) 2/4 Solenoid Control circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
7) 2/4 SOLENOID/PRESSURE SWITCH ASSEMBLY View repair. Repair Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 109

Scheme 109: Diagnostic Test

Scheme 110

Scheme 111

1) DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read Transmission DTCs. Are there any TCM Power Input DTCs present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK TO SEE IF P0760 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 for P0760 set at 0? Yes Go To step 3) . No Go To step 8) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. 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 during actuation? Yes Go To step 7) . No Go To step 4) .
4) (T60) OD SOLENOID CONTROL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T60) OD Solenoid Control circuit from the appropriate terminal of special tool #8815 to the Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T60) OD Solenoid Control circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (T60) OD SOLENOID CONTROL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T60) OD SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. 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 voltage of the (T60) OD Solenoid Control circuit. Is the voltage above 0.5 volts? Yes Repair the (T60) OD Solenoid Control circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
7) OD SOLENOID/PRESSURE SWITCH ASSEMBLY View repair. Repair Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 112

Scheme 112: Diagnostic Test

Scheme 113

Scheme 114

1) DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read Transmission DTCs. Are there any TCM Power Input DTCs present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK TO SEE IF P0765 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 for P0765 set at 0? Yes Go To step 3) . No Go To step 8) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. 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 during actuation? Yes Go To step 7) . No Go To step 4) .
4) (T59) UD SOLENOID CONTROL CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T59) UD Solenoid Control circuit from the appropriate terminal of special tool #8815 to the Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T59) UD Solenoid Control circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (T59) UD SOLENOID CONTROL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T59) UD SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 (T59) UD Solenoid Control circuit. Is the voltage above 0.5 volts? Yes Repair the (T59) UD Solenoid Control circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) . 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
7) UD SOLENOID/PRESSURE SWITCH ASSEMBLY View repair. Repair Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 115

Scheme 115: Circuit Schematic

The Transmission system uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD elements. The pressure switches are continuously monitored for the correct states in each gear. If a set condition is identified, 1st gear and torque converter lock-up (EMCC) will be inhibited. The vehicle will launch in 2nd gear and shift normally through the gears without allowing EMCC. If during the same key start, the set condition is no longer valid, the transmission will return to normal operation (1st and EMCC available). Limp-in will not occur unless DTC P0841 is accompanied by a code P0706 and the MIL will illuminate after 5 minutes of substituted operation.

GEAR	L/R	2/4	OD
R	OP	OP	OP
P/N	CL	OP	OP
1st	CL	OP	OP
2nd	OP	CL	OP
D	OP	OP	CL
OD	OP	CL	CL
OP = OPEN
CL = CLOSED

PRESSURE SWITCH STATES

Scheme 116

Scheme 116: Diagnostic Test

Scheme 117

Scheme 118

1) DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT With the scan tool, read Transmission DTCs. Are there any TCM Power Input DTCs present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK FOR LOSS OF PRIME DTC With the scan tool, check for other Transmission DTCs. Is the DTC P0944 present also? Yes Perform appropriate DTC test(s) in this article. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) CHECK TO SEE IF P0841 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0841. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 4) . No Go To step 9) .
4) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, turn the Pressure Switch selector to L/R. 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? Yes Go To step 8) . No Go To step 5) .
5) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T50) L/R Pressure Switch Sense circuit from the appropriate terminal of special tool #8815 to the Transmission Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T50) L/R Pressure Switch Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. NOTE: Check connectors - Clean/repair as necessary. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (A104)Fused B+ circuit and (T16) Transmission Control Relay Output circuit. Ignition on, engine not running. Measure the voltage of the (T50) L/R Pressure Switch Sense circuit. Is the voltage above 0.5 volts? Yes Repair the (T50) L/R Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) L/R PRESSURE SWITCH View repair. Repair Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Background: Pressure switches are normally off or open (no pressure applied) and read high (+12 volts). When an element is applied the corresponding pressure switch closes to ground (0 volts) or turns on. The controller tests the OD and 24 pressure switches when they are off (ie. when the corresponding friction element is not applied) by briefly applying the OD and 24 elements which will cause the corresponding pressure switch to close. The test verifies that the switches are operational and that the switch will close when the corresponding element is applied. If a switch fails to respond, it is re-tested. The MIL illuminates and the transmission system defaults to Limp-in mode.

GEAR	L/R	2/4	OD
R	OP	OP	OP
P/N	CL	OP	OP
1st	CL	OP	OP
2nd	OP	CL	OP
D	OP	OP	CL
OD	OP	CL	CL
OP = OPEN
CL = CLOSED

PRESSURE SWITCH STATES

Scheme 119

Scheme 119: Diagnostic Test

Scheme 120

Scheme 121

Scheme 122

1) CHECKING FOR LOSS OF PRIME DTC With the scan tool, check for other Transmission DTCs. Is the DTC P0944 present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK FOR RELATED TRANSMISSION DTC'S With the scan tool, read Transmission DTC's. Are any of the DTCs P0732, P0734 and/or P0846 present also? Yes Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) 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 4) . No Go To step 10) .
4) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, turn the Pressure Switch selector switch to 2/4. With the scan tool, monitor the UD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Wiggle the wires leading to the PCM while pressing and holding the Pressure Switch Test button. Did the 2/4 Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To step 5) . No Go To step 6) .
5) INTERNAL TRANSMISSION View repair. Repair Disassemble and inspect the Valve Body per the Service Information and repair or replace as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/Pressure Switch Assembly. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T47) 2/4 Pressure Switch Sense circuit from the appropriate terminal of special tool #8815 to the Transmission Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T47) 2/4 Pressure Switch Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the (T47) 2/4 Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit. Ignition on, engine not running. Measure the voltage of the (T47) 2/4 Pressure Switch Sense circuit. Is the voltage above 0.5 volts? Yes Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 9) .
9) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 (T16) Transmission Control Relay Output circuit in the Transmission Solenoid/Pressure Switch Assembly harness 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 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Repair the Transmission Control Relay Output circuit for an open or high resistance. If the fuse is open make sure to check for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
10) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

The Transmission system uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD elements. The pressure switches are continuously monitored for the correct states in each gear. The 2/4 pressure switch monitors the fluid pressure to the 2/4 clutch to confirm proper operation of the 2/4 solenoid. If the 2/4 pressure switch is identified as closed in P or N, the code will immediately be set and normal operation will be allowed for that given key start. If the problem is identified for 3 successive ignition cycles, the transmission will go into Limp-in mode.

GEAR	L/R	2/4	OD
R	OP	OP	OP
P/N	CL	OP	OP
1st	CL	OP	OP
2nd	OP	CL	OP
D	OP	OP	CL
OD	OP	CL	CL
OP = OPEN
CL = CLOSED

PRESSURE SWITCH STATES

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 931 kPa (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 123

Scheme 123: Diagnostic Test

Scheme 124

Scheme 125

Scheme 126

1) CHECK FOR RELATED DTCS With the scan tool, check for other transmission DTCs. Is the DTC P0932 present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK IF THE DTC IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0868. 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 10) .
3) CHECK THE PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay from the PDC. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so can result in personal injury or death. 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 and the Electronic Transmission Adapter kit. On the Transmission Simulator select the "OFF" position of the "Input/Output Speed" switch. 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 4) . No Go To step 6) .
4) CHECK THE 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 a Pressure Gauge, 0 to 2000 kPa or 0 to 300 psi to the L/R test port. 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 5) . No Replace the Line Pressure Sensor per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) CHECK FOR A 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 Transmission Oil Filter per the Service Information. Does the Oil Pan contain excessive debris and/or is the Transmission Oil Filter plugged? Yes Repair as necessary. If the Transmission Oil Filter is plugged or there is excessive debris, refer to the Service Information for the proper Hydraulic repair procedure. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Repair internal transmission and inspect the Transmission Oil Pump per the Service Information and replace if necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit. Reconnect all previously disconnected connectors except the Line Pressure Sensor/Variable Force Solenoid Assembly harness connector. Ignition on, engine not running. Measure the voltage of the (F856) 5-volt Supply circuit. Is the voltage above 5.5 volts? Yes Repair the (F856) 5-volt Supply circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN 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 between the Line Pressure Sensor/Variable Force Solenoid Assembly harness connector and 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 9) .
9) CHECK THE (T118) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT Turn the ignition off to the lock position. Disconnect the Line Pressure Sensor/Variable Force Solenoid Assembly harness connector. Disconnect all PCM harness connectors. Measure the resistance between the (T118) Pressure Control Solenoid Control circuit and all other circuits in the Line Pressure Sensor/Variable Force Solenoid Assembly harness connector. Is the resistance below 5.0 ohms between the (T118) Pressure Control Solenoid Control circuit and any other circuit(s) in the Line Pressure Sensor/Variable Force Solenoid Assembly harness connector? Yes Repair the (T118) Pressure Control Solenoid Control circuit for a short to another circuit(s). Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
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 DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

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 931 kPa (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 127

Scheme 127: Diagnostic Test

Scheme 128

1) CHECK FOR RELATED DTCS With the scan tool, check for other Transmission DTCs. Are there any line pressure sensor or transmission relay output DTCs present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK IF THE DTC IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0869. Is the STARTS SINCE SET COUNTER 2 or less? Yes Go To step 3) . No Go To step 9) .
3) CHECK THE PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so can result in personal injury or death. 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 and the Electronic Transmission Adapter kit. 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 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 4) . No Go To step 5) .
4) CHECK THE LINE PRESSURE SENSOR CALIBRATION Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit and reconnect all previously disconnected connectors. Install the Line Pressure Gauge, Miller tool #C-3293, 0 to 2000 kPa or 0 to 300 psi in the L/R pressure port. 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 Pressure Control Solenoid. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Replace the Line Pressure Sensor per the Service information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) CHECK THE (T118) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT FOR AN 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 (T118) Pressure Control Solenoid Control circuit between the Line Pressure Sensor/Variable Force Solenoid Assembly harness connector and the appropriate terminal of Miller tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T118) Pressure Control Solenoid Control circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 6) .
6) CHECK THE (T118) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (T118) Pressure Control Solenoid Control circuit. Is the resistance below 5.0 ohms? Yes Repair the (T118) Pressure Control Solenoid Control circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor/Variable Force Solenoid Assembly 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM C1 harness connector. Disconnect the Line Pressure Sensor/Variable Force Solenoid 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. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
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 DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 129

Scheme 129: Diagnostic Test

Scheme 130

Scheme 131

Scheme 132

1) CHECKING FOR LOSS OF PRIME DTC With the scan tool, check for other Transmission DTC's. Is the DTC P0944 present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK FOR RELATED TRANSMISSION DTC'S With the scan tool, read Transmission DTC's. Are any of the DTCs P0732, P0734 and/or P0846 present also? Yes Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) CHECK TO SEE IF DTC P0870 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0870. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter 2 or less? Yes Go To step 4) . No Go To step 10) .
4) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. NOTE: Check connectors - Clean/repair as necessary. Ignition on, engine not running. With the Transmission Simulator, turn the Pressure Switch selector switch to OD. With the scan tool, monitor the UD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator. Wiggle the wires leading to the PCM while pressing and holding the Pressure Switch Test button. Did the OD Pressure Switch state change to closed and remain closed while wiggling the wires? Yes Go To step 5) . No Go To step 6) .
5) INTERNAL TRANSMISSION View repair. Repair Disassemble and inspect the Valve Body per the Service Information and repair or replace as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/Pressure Switch Assembly. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) (T9) OD PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T9)OD Pressure Switch Sense circuit from the appropriate terminal of special tool #8815 to the Transmission Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T9) OD Pressure Switch Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. NOTE: Check connectors - Clean/repair as necessary. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) (T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit. Ignition on, engine not running. Measure the voltage of the (T9) OD Pressure Switch Sense circuit. Is the voltage above 0.5 volts? Yes Repair the (T9) OD Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 9) .
9) (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) 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 (T16) Transmission Control Relay Output circuit in the Transmission Solenoid/Pressure Switch Assembly harness 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 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Repair the (T16) Transmission Control Relay Output circuit for an open. If the fuse is open make sure to check for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
10) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

The Transmission system uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD elements. The pressure switches are continuously monitored for the correct states in each gear. Normal operation will be experienced if no other codes are present. Transmission Control System will ignore the code. Limp-in condition will only occur if DTC P0871 is present with a DTC P0706.

GEAR	L/R	2/4	OD
R	OP	OP	OP
P/N	CL	OP	OP
1st	CL	OP	OP
2nd	OP	CL	OP
D	OP	OP	CL
OD	OP	CL	CL
OP = OPEN
CL = CLOSED

PRESSURE SWITCH STATES

The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the PCM. It is referred to as the Trans Relay Output circuit or switched battery. After a controller reset (ignition key turned to the run position or after cranking engine), the controller energizes the relay. Prior to this, the PCM verifies that the contacts are open by checking for no voltage at the transmission control relay outputs (switched battery) terminals. After the relay is energized, the PCM monitors the terminals to verify that the voltage is greater than 3 volts. The MIL illuminates and the transmission will be placed in Limp-in.

Scheme 133

Scheme 133: Diagnostic Test

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

1) CHECK TO SEE IF DTC P0882 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0882. 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 11) .
2) CHECK THE (INTERNAL) FUSED B+ CIRCUIT Turn the ignition off to the lock position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Using a 12-volt test light connected to ground, check the (Internal) 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 Go To step 8) .
3) (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and the (T16) Transmission Control Relay Output circuits. Ignition on, engine not running. With the scan tool in Transmission Sensors, read the Switched Battery voltage. Does the Switched Battery voltage read battery voltage? Yes Go To step 4) . No Repair the (T16) Transmission Control Relay Output circuits for an open or high resistance. Note: There are multiple Transmission Control Relay Output circuits. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
4) TRANSMISSION CONTROL RELAY Turn the ignition off to the lock position. Install a substitute Relay in place of the Transmission Control Relay. Ignition on, engine not running. With the scan tool in Transmission Sensors, read the Switched Battery voltage. Does the Switched Battery voltage read battery voltage? Yes Replace the Transmission Control Relay. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) (Z901) TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Using a 12-volt test light connected to 12-volts, check the (Z901) Transmission Control Relay Ground circuit. 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 6) . No Repair the (Z901) Transmission Control Relay Ground circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN Turn the ignition off to the lock position. Remove the Transmission Control Relay. Disconnect the PCM C4 harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T15) Transmission Control Relay Control circuit between the Transmission Control Relay connector and the appropriate terminal of special tool #8815. Is the resistance above 5.0 ohms? Yes Repair the (T15) Transmission Control Relay Control circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
8) CHECK THE FUSED B+ CIRCUIT FOR SHORT TO GROUND Turn the ignition off to the lock position. Remove the Transmission Control Relay. Disconnect the PCM C4 harness connectors. 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 Special Tool #8815 to perform diagnosis. Measure the resistance between ground and the (T16) Transmission Control Relay Output circuit. Is the resistance below 5.0 ohms? Yes Go To step 9) . No Repair the Fused B+ circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
9) (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 10) .
10) TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits. View repair. Repair Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
11) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. With the scan tool, check the EATX EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

Scheme 139

Scheme 139: Circuit Schematic

The transmission relay is used to supply power to the solenoid pack when in normal operating mode, and to turn off power to produce transmission "limp-in" mode. The relay output (which supplies power to the solenoid pack) is fed back to the controller This is referred to as SWITCHED BATTERY. After a controller reset (ignition key turned to the RUN position or after cranking engine), the controller verifies that the relay contacts are open by checking for no voltage on Switched battery line (ie. relay output) before the relay is energized. Transmission locked in Limp-In. MIL on after 10 sec. of vehicle operation.

Scheme 140

Scheme 140: Diagnostic Test

Scheme 141

1) CHECK TO SEE IF DTC P0883 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0883. 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 5) .
2) TRANSMISSION CONTROL RELAY CONTACTS STUCK CLOSED Turn the ignition off to the lock position. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between the Fused B+ circuit and the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
3) (T16) TRANSMISSION RELAY OUTPUT CIRCUIT SHORT TO VOLTAGE 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. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 4) .
4) (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE 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. NOTE: The Transmission Controller will power up the Transmission Control Relay Control circuit for approximately 3.0 seconds after initial ignition on. Wait at least 3.0 seconds before performing the following voltage check. NOTE: A One-trip fault may set for P0888 Relay Always Off, disregard the DTC. Measure the voltage at the (T15) Transmission Control Relay Control circuit after a 3.0 second wait period. Is the voltage above 0.5 volts? Yes Repair the (T15) Transmission Control Relay Control circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

If a vehicle loses power to the PCM, the vehicle will go to the 2nd gear mode since there is no power available to control the transmission solenoids. However if power is restored, the PCM will power-up and normal operation will be restored. This DTC identifies that power to the PCM was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 32 Km/h (20 mph). If a customer shifts to Neutral and cycles the ignition key and quickly shifts to "Drive" while moving before the PCM comes out of its START ROUTINE, the DTC can be set. Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving. The transmission will not be placed in Limp-in. This is an informational DTC to be used when attempting to diagnose an intermittent 2nd gear operation and subsequent return to normal transmission operation.

The transmission relay is used to supply power to the solenoid pack when in normal operating mode, and to turn off power to produce transmission "limp-in" mode. The relay output (which supplies power to the solenoid pack) is fed back to the controller. It is referred to as SWITCHED BATTERY. After a controller reset (ignition key turned to the RUN position or after cranking engine), the controller verifies that the relay contacts are open by checking for no voltage on Switched battery line (ie. transmission control relay output) before the relay is energized. After switched battery is verified for no voltage, the voltage of each of the solenoid pack pressure switches is also checked. Since the solenoid pack is not powered up, there should be no voltage on any of the pressure switches.

Scheme 142

Scheme 142: Diagnostic Test

Scheme 143

Scheme 144

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 5) .
2) (T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. 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 voltage of the (T9) OD Pressure Switch Sense circuit. Is the voltage above 0.5 volt? Yes Repair the (T9) OD Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. 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 voltage of the (T47) 2/4 Pressure Switch Sense circuit. Is the voltage above 0.5 volt? Yes Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 4) .
4) (T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. 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 voltage of the (T50) L/R Pressure Switch Sense circuit. Is the voltage above 0.5 volts? Yes Repair the (T50) L/R Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

To prevent a bump due to A/C clutch engagement, a temporary torque converter partial EMCC condition is established prior to A/C clutch engagement. A message is received over the bus indicating that A/C clutch engagement is imminent. Partial EMCC is then established and a reply message, "OK to engage A/C clutch" is sent via the bus. Partial EMCC will be held for 450 ms before returning to full EMCC. During the transition from full to partial EMCC, a turbine acceleration sum is calculated, if this value exceeds a threshold value for several transitions, degraded transmission fluid is indicated.

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 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 a Line Pressure Sensor or wiring problem and will cause either DTC P0934 or P0935 to set.

Scheme 145

Scheme 145: Diagnostic Test

1) CHECK 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) CHECK THE PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so can result in personal injury or death. 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 and the Electronic Transmission Adapter kit. 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: 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 Replace the Line Pressure Sensor per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR A 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 and the Electronic Transmission Adapter kit. 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 4) .
4) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN 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/Variable Force Solenoid Assembly harness connector and the appropriate terminal of Miller tool #8815. Is the resistance below 5.0 ohms? Yes Go To step 5) . No Repair the (F856) 5-volt Supply circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
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 DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

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 146

Scheme 146: Diagnostic Test

Scheme 147

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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) CHECK THE PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear. WARNING: The Starter Relay must be removed from the PDC. Failure to do so can result in personal injury or death. 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 and the Electronic Transmission Adapter kit. 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: 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 Replace the Line Pressure Sensor per the Service Information. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN Turn the ignition off to the lock position. Disconnect the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit. 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/Variable Force Solenoid Assembly 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 4) .
4) CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN 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/Variable Force Solenoid Assembly 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 5) .
5) CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR A 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) CHECK 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 DTC EVENT DATA to help identify the conditions in which the DTC was set. Where there any problems found? Yes Repair as necessary. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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 ruptured oil filter. The Loss of Prime fault 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.

Pressure switches are normally off or open (no pressure applied) and read high (+12 volts). When an element is applied, the corresponding pressure switch closes to ground (0 volts) or turns on. The controller tests the OD and 2/4 pressure switches when they are off (when the corresponding friction element is not applied) by briefly applying the OD and 2/4 elements which will cause the corresponding pressure switch to close. The test verifies that the switches are operational and that the switch will close when the corresponding element is applied. If a switch fails to respond, it is re-tested. The MIL illuminates and the transmission system defaults to Limp-in mode.

1) CHECK TO SEE IF DTC P0992 IS CURRENT NOTE: The vehicle must be driven to set this DTC. The transmission must at operating temperature with the Engine RPM above 1000 RPM. This DTC is an indication of both the 2/4 and the O/D Hydraulic Pressure Switch DTCs present. Perform the diagnostic procedures for both P0845 and P0870. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. View repair. Repair Perform appropriate DTC test(s) in this article for P0845 and P0870.

Note: This is not a fault code. It exists to provide reference information only. A battery backed RAM is used to maintain some learned values. When the battery is disconnected, this memory is lost. When the battery is reconnected, the loss of learned values will be detected by the controller. The code will be set and the learned values will be initialized to known constants and the learning process will continue. Setting the code has no effect except for re-initialization of learned values.

Scheme 149

Scheme 149: Diagnostic Test

Scheme 150

1) BATTERY WAS DISCONNECTED Has the battery been disconnected, lost its charge, or been replaced recently? Yes Disconnecting or replacing the battery will set this DTC. Erase the DTC. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 2) .
2) WAS QUICK LEARN PERFORMED Has a Quick Learn procedure been performed? Yes Performing Quick Learn will set this DTC. Erase the DTC. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 3) .
3) PCM REPLACED OR DISCONNECTED Has the PCM been replaced or disconnected? Yes Replacing or disconnecting the PCM will set this DTC. Erase the DTC. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 4) .
4) (A209) FUSED B+ CIRCUIT Turn the ignition off to the lock position. Disconnect the PCM C1 harness connector. 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 Special Tool #8815 to perform diagnosis. Using a 12-volt test light connected to ground, check the (A209) Fused B+ circuit. 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 5) . No Repair the Fused B+ circuit for an open. If the fuse is open make sure to check for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) (Z904) GROUND CIRCUITS Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Using a 12-volt test light connected to 12-volts, check the (Z904) Ground circuits in the appropriate terminal of special 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 all the ground circuits? Yes Go To step 6) . No Repair the Ground circuits for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set the 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 «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

This DTC is an informational DTC to inform the technician that transmission has been operating in an open-loop line pressure control for 3220 kilometers (2000 miles) or 1000 2-3 upshifts resulting from a Line Pressure DTC. The 42RLE Transmission is not designed to operate in open-loop line pressure control for an extended period time. This DTC is intended to protect the transmission. If the DTC sets, the transmission controller will place the transmission into limp-in mode.

The Solenoid Switch Valve, an internal, hydraulically operated valve, controls the direction of the transmission fluid when the LR solenoid is energized. When the solenoid switch valve is in the downshifted position and the LR solenoid is energized, fluid is directed to the LR element for 1st gear. When the solenoid switch valve is In the up-shifted position (2nd, 3rd, and 4th gear) and the LR solenoid is energized, fluid is directed into the Lockup Switch Valve which controls the Torque Converter Clutch. When shifting into 1st gear, a special sequence is followed to insure solenoid switch valve movement into the downshifted position. The LR pressure switch is monitored to confirm switch valve movement. If the solenoid switch valve movement is not confirmed (i.e. no LR pressure when the LR solenoid is energized), 2nd gear is substituted for 1st. No 1st gear (2nd gear is substituted). The transmission Torque converter FEMCC operation is inhibited. MIL on after 5 min. of substituted operation.

Scheme 151

Scheme 151: Diagnostic Test

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1) DETERMINING IF RELATED DTCS ARE PRESENT With the scan tool, check for other Transmission DTCs. Is the DTC P0841 present also? Yes Perform appropriate DTC test(s) in this article. No Go To step 2) .
2) CHECK TO SEE IF DTC P1775 IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P1775. 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 9) .
3) PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter. Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A. Ignition on, engine not running. With the Transmission Simulator, turn the Pressure Switch selector switch to LR. With the scan tool, monitor the LR Pressure Switch State while pressing the Pressure Switch Test button. Did the Pressure Switch state change from open to closed when the test button was pressed? Yes Go To step 4) . No Go To step 5) .
4) INTERNAL TRANSMISSION If there are no possible causes remaining, view repair. Repair Repair internal transmission as necessary per the Service Information. Inspect the Solenoid Switch Valve per the Service Information and repair or replace as necessary. If no problems are found, replace the Transmission Solenoid/Pressure Switch Assembly. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
5) (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. Connect a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit. 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 Special Tool #8815 to perform diagnosis. Disconnect the PCM C4 harness connector. Remove the Starter Relay. Using a 12-volt test light connected to ground, check all (T16) Transmission Control Relay Output circuits in the appropriate terminals of special 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 on all Transmission Control Relay Output circuits? Yes Go To step 6) . No Repair the (T16) Transmission Control Relay Output circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
6) (T50) LR PRESSURE SWITCH SENSE CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. 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 Special Tool #8815 to perform diagnosis. Measure the resistance of the (T50) LR Pressure Switch Sense circuit from the appropriate terminal of special tool #8815 to the Transmission Solenoid/Pressure Switch Assembly harness connector. Is the resistance above 5.0 ohms? Yes Repair the (T50) LR Pressure Switch Sense circuit for an open. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 7) .
7) (T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the (T50) LR Pressure Switch Sense circuit. Is the resistance below 5.0 ohms? Yes Repair the (T50) LR Pressure Switch Sense circuit for a short to ground. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Go To step 8) .
8) (T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE Turn the ignition off to the lock position. Disconnect the PCM C4 harness connector. Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector. Remove the Transmission Control Relay. NOTE: Check connectors - Clean/repair as necessary. Connect a jumper wire between the (Internal) Fused B+ circuit and (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector. Ignition on, engine not running. Measure the voltage of the (T50) LR Pressure Switch Sense circuit. Is the voltage above 0.5 volts? Yes Repair the (T50) LR Pressure Switch Sense circuit for a short to voltage. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) 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, then program Pinion Factor in the Front Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-255944-S20276399462007060500000) Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000)
9) INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Test drive and verify if the transmission is launching in 2nd gear and/or no TCC engagement. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Are there 2nd gear launches and/or no TCC engagement? Yes Disassemble and inspect the Valve Body per the Service Information and repair or replace as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid Pressure Switch Assembly. Perform «42RLE TRANSMISSION VERIFICATION TEST - VER 1»(ref-256188-S02428644272007061100000) No Test Complete.

The Solenoid Switch Valve, an internal, hydraulically operated valve, controls the direction of the transmission fluid when the LR solenoid is energized. When the solenoid switch valve is in the downshifted position and the LR solenoid is energized, fluid is directed to the LR element for 1st gear. When the solenoid switch valve is In the up-shifted position (2nd, 3rd, and 4th gear) and the LR solenoid is energized, fluid is directed into the Lockup Switch Valve which controls the Torque Converter Clutch. When doing PEMCC or FEMCC, the LR pressure switch should indicate no pressure if the solenoid switch valve is in the LR position. If the LR pressure switch indicates pressure for some time while in partial or full EMCC, the EMCC operation is aborted and momentarily inhibited to avoid accidental application of the LR clutch. EMCC is attempted again when there is no LR pressure. The fourth detection of LR pressure while in PEMCC or FEMCC will result in setting the DTC. Torque converter EMCC operation inhibited. MIL on after 5 min. of substituted operation.

This DTC is not stored alone. It is stored if a Gear Ratio DTC is detected immediately after shift. The existence of DTC P1790 indicates a mechanical or hydraulic (not electrical) related problems. It should be noted, however, that all mechanical problems don't necessarily result in DTC P1790. When this DTC exists, diagnosing the system should be based on the associated DTC and only mechanical causes should be considered.

The two speed sensors in the transmission system and use a common ground circuit. The loss of this common ground results in the input signal being sensed by both sensors. After a reset and in neutral, and observing a certain Output/Input ratio will increment the Speed Check Fault Counter. Because the speed sensors and the thermistor share the same ground wire, this DTC may indicate a loss of the common speed sensor ground. In some cases this fault will cause a Gear Ratio Error DTC to be set.

The major cause of heat build up in the transmission is torque converter slip. With the transmission in the AutoStick® mode, the torque converter can slip during aggressive driving or heavy loading conditions such as trailer towing or driving up steep grades. In the non autostick mode, internal controller logic prevents the transmission from overheating by managing the shift and EMCC schedule. In the autostick mode, when the transmission or engine temperature approaches an overheat condition, the manual shift overheat DTC sets and the autostick mode is temporarily suspended until the temperature returns to normal.

The NGC controller communicates over the CAN C bus. The transmission controller continuously monitors bus activity. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine Controller is unable to communicate with the Transmission Controller, a DTC will set and the Engine Controller will illuminate the MIL.

Diagnose the U0002 CAN C BUS OFF PERFORMANCE as the U0001 CAN C BUS CIRCUIT test in 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes.

Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS for diagnostic procedures and for further possible causes.

42RLE Automatic Transmission - Electrical Diagnostics: Overview Dodge Charger V

Theory Of Operation

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