P1887
DTC P1887 (3.5L)
Circuit Description
The torque converter clutch (TCC) release switch is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFP manual valve position switch is attached to the control valve body. The TCC release switch is normally-closed.
The switch signals the powertrain control module (PCM) that the TCC is released. This is accomplished by torque converter release fluid pressure acting on the switch contact, thus opening the switch. When the voltage is high on the circuit, the PCM recognizes that the TCC is no longer engaged.
When the PCM determines that the TCC release switch is open, indicating that the TCC is not applied, and the TCC slip speed indicates that the TCC is applied, then DTC P1887 sets. DTC P1887 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P1887 Torque Converter Clutch (TCC) Release Switch Circuit
Conditions for Running the DTC
^ No MAF DTCs P0101, P0102 or P0103.
^ No MAP DTCs P0107 or P0108.
^ No ISS DTCs P0716 or P0717.
^ No TCC DTCs P0741 or P0742.
^ No TCC electrical DTC P2761.
^ The engine is running for 5 seconds or more and not in fuel cut off.
^ The engine torque is greater than 41 Nm (30 ft. lbs.).
^ The TCC is commanded ON.
^ The TCC slip speed is -20 to +60 RPM.
Conditions for Setting the DTC
The TCC release switch is open, release fluid pressure present, for 6 seconds, twice during the same trip.
Action Taken When the DTC Sets
^ The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
^ The PCM forces the TCC OFF.
^ The PCM inhibits TCC engagement.
^ The PCM freezes transmission adaptive functions.
^ The PCM inhibits 4th gear when in HOT mode.
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
^ The PCM stores DTC P1887 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
^ The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
^ A scan tool can clear the MIL/DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids
Ensure the wiring harness is not stretched too tightly or other components are pressing on the connector body. Also, inspect for proper clearance to any other components and wiring. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the ability of the PCM to recognize a grounded circuit.
7. This step tests for a mechanical or hydraulic condition.
