P1887

P1887 - TCC RELEASE SWITCH CIRCUIT (L81)









The Torque Converter Clutch (TCC) pressure release switch is part of the Transaxle Fluid Pressure (TFP) switch assembly. The TFP switch assembly is mounted to the transaxle control valve body. The TCC pressure release switch is normally closed. The switch signals the TCM 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 TCM recognizes the TCC is no longer engaged. When the TCM determines the TCC release switch is open (indicating the TCC is not applied) and the TCC slip speed indicates the TCC is applied, then DTC P1887 sets.

DTC PARAMETERS
DTC P1887 will set if twice in a trip TCC pressure release switch is open (TCC release fluid pressure is present) for 6 seconds and the following conditions have been met:
- The engine is running
- The TFP switch assembly indicates D4 range
- The TCC is commanded ON
- The TCC slip speed is -20 to +40 rpm
- The engine torque is greater than 45 Nm (33 ft. lbs.)
- No ISS on TCC system, DTCs have been set

DIAGNOSTIC AIDS
Inspect wiring at TCM, transaxle connector, TFP valve position switch connector, and all other circuit connecting points for the following conditions:
- 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 condition, massage the wiring harness while watching the test equipment for a change.