P1887

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Torque Converter Clutch (TCC) release switch is part of the Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.). The Transaxle Fluid Pressure (TFP) Val. Position Sw. is mounted to the transmission valve body. The TCC release switch is normally-closed.

The switch signals the Powertrain Control Module that the TCC is released. This is accomplished by Torque Converter release fluid pressure acting on the switch contact, and opening circuit 657/1804. When the voltage is high on the circuit, the PCM recognizes that the TCC is no longer engaged.

If 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.

CONDITIONS FOR SETTING THE DTC

^ No Input Speed Sensor DTCs P0716 or P0717.

^ No TCC Solenoid DTCs P0741 or P0742.

^ No TFP Val. Position Sw. DTC P1810.

^ The engine speed is greater than 500 RPM for 5 seconds, and not in fuel shut off.

^ The transmission range switch is in D4.

^ The TCC is commanded ON.

^ The engine torque is 45 - 407 Nm (33 - 300 ft. lbs.).

^ The TCC slip speed is -20 to +40 RPM.

^ The TCC release pressure is present (the switch is open).

^ All of the above conditions are met for 6 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

^ The PCM disables shift adapts.

^ The PCM inhibits TCC operation.

^ The PCM inhibits 4th gear if the transmission is in the hot mode.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the Malfunction Indicator Lamp (MIL) after three consecutive trips without a failure reported.

^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS

^ Inspect the wiring at the PCM, transmission 20-way connector, and all other circuit connection points for the following problems:

- A bent terminal

- A backed out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

- Moisture intrusion

- Corrosion

^ When diagnosing for an intermittent short or open, massage the wiring hamess while watching the test equipment for a change.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

3. This step tests the PCM's ability to recognize an open circuit.

4. This step tests the PCM's ability to recognize a grounded circuit.

13. Because of the harsh conditions inside the transmission, repairing the A/T Wiring Harness is not acceptable. You must replace the A/T Wiring Harness.