For a complete wiring diagram Refer to Section 8W.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 (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.When Monitored: One time after a reset (ignition key turned to the RUN position or after cranking engine).Set Condition:A fault is set if voltage greater than 4.5 volts is detected for 7 ms on any of the pressure switch circuits before the relay is energized. The transmission is placed in limp-In. The MIL is on after 10 seconds. of vehicle operation.Possible Causes(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGEPOWERTRAIN CONTROL MODULEAlways perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) 1. CHECK TO SEE IF DTC P0890 IS PRESENTWith the scan tool, view DTCs.Is the status Active for this DTC or is the STARTS SINCE SET counter set at 0?YesGo To 2NoGo To 52. (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.Ignition on, engine not running.With the scan tool under TIPM, actuate the Transmission.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?YesRepair the (T9) OD Pressure Switch Sense circuit for a short to voltage.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 33. (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

With the scan tool under TIPM, actuate the Transmission.Measure the voltage of the (T47) 2/4 Pressure Switch Sense circuit.Is the voltage above 0.5 volt?YesRepair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoGo To 44. (T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

With the scan tool under TIPM, actuate the Transmission.Measure the voltage of the (T50) L/R Pressure Switch Sense circuit.Is the voltage above 0.5 volts?YesRepair the (T50) L/R Pressure Switch Sense 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. If no problems are found, replace and program 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) 5. 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.Were there any problems found?YesRepair as necessary.Perform 42RLE TRANSMISSION VERIFICATION TEST (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE) NoTest Complete.