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.
One time after a reset (ignition key turned to the RUN position or after cranking engine).
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.
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Possible Causes
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(T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE |
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(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE |
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(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE |
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POWERTRAIN CONTROL MODULE |
Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
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.
