For a complete wiring diagram Refer to Section 8W.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 system checks.When Monitored:The transmission gear ratio is monitored continuously while the transmission is in gear.Set Condition:If there is an excessive change in the Output RPM in any gear.Possible Causes(T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN(T13) SPEED SENSOR GROUND CIRCUIT OPEN(T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND(T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE(T13) SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGEOUTPUT SPEED SENSORPOWERTRAIN CONTROL MODULEAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) 1. CHECK IF THE DTC IS CURRENTStart the engine in Park.Raise the drive wheels off of the ground.Properly support the vehicle.Firmly apply the brakes and place the transmission selector in Drive.Be sure to keep hands and feet clear of rotating wheels.Release the brakes and allow the drive wheels to spin freely.The drive wheels must be turning at this point.With the scan tool, read the Output RPMIs the Output RPM below 100?YesGo To 2NoGo To 82. CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATORTurn the ignition off to the lock position.Remove the Ignition Switch Feed fuse from the TIPM.Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear. The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in personal injury or death.Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit.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)?YesReplace the Output Speed Sensor per the Service Information.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 33. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN

Turn the ignition off to the lock position.Disconnect the PCM C4 harness connector.Disconnect the Output Speed Sensor harness connector.Check connectors - Clean/repair as necessary.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis.Measure the resistance of the (T14) Output Speed Sensor Signal circuit between the Output Speed Sensor harness connector and the appropriate terminal of Miller tool #8815.Is the resistance above 5.0 ohms?YesRepair the (T14) Output Speed Sensor Signal circuit for an open.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 44. CHECK THE (T13) SPEED SENSOR GROUND CIRCUIT FOR AN OPEN

Measure the resistance of the Speed Sensor Ground circuit between the Output Speed Sensor harness connector and the appropriate terminal of Miller tool #8815.Is the resistance above 5.0 ohms?YesRepair the (T13) Speed Sensor Ground circuit for an open.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 55. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between ground and the (T14) Output Speed Sensor Signal circuit.Is the resistance below 5.0 ohms?YesRepair the (T14) Output Speed Sensor Signal circuit for a short to ground.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 66. CHECK THE (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition on, engine not running.With the scan tool under TIPM, actuate the Transmission.Measure the voltage of the (T14) Output Speed Sensor Signal circuit.Is the voltage above 0.5 volt?YesRepair the (T14) Output Speed Sensor Signal circuit for a short to voltage.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 77. CHECK THE (T13) SPEED SENSOR GROUND CIRCUIT FOR A SHORT TO VOLTAGE

With the scan tool under TIPM, actuate the Transmission.Measure the voltage of the (T13) Speed Sensor Ground circuit.Is the voltage above 0.5 volts?YesRepair the (T13) Speed Sensor Ground circuit for a short to voltage.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoUsing 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. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) 8. INTERMITTENT WIRING AND CONNECTORSThe 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 DTC EVENT DATA to help identify the conditions in which the DTC was set.Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply.Were there any problems found?YesRepair as necessary.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoTest Complete.