P0894

DTC P0894





Circuit Description
The powertrain control module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the torque converter clutch (TCC) engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +50 RPM.

When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P0894 sets. DTC P0894 is a type B DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0894 Transmission Component Slipping

Conditions for Running the DTC
^ No TCC stuck ON or stuck OFF DTC P0741 or P0742.
^ No vehicle speed sensor (VSS) DTCs P0502 or P0503.
^ No 1-2 SS valve DTC P0973 or P0974.
^ No 2-3 SS valve DTC P0976 or P0977.
^ No 3-2 SS valve DTC P0787 or P0788.
^ No transmission fluid pressure (TFP) manual valve position switch DTC P1810, P1815 or P1816.
^ The engine speed is greater than 475 RPM for 5 seconds.
^ The engine torque is 100 - 525 Nm (74 - 387 ft. lbs.).
^ The throttle position (TP) angle is 10-99 percent.
^ The vehicle speed is 60 - 200 km/h (37 - 124 mph).
^ The speed ratio is 0.70-2.00, speed ratio is engine speed divided by the transmission output speed.
^ The gear range is D4.
^ The transmission fluid temperature (TFT) is 20 - 130°C (68 - 266°F).
^ The shift solenoid performance diagnostic counters are zero.

Conditions for Setting the DTC
DTC P0894 sets if the following conditions occur for three TCC cycles.
^ The TCC is commanded ON for 3 seconds.
^ The TCC is at 60 percent duty cycle for 5 seconds.
^ The TCC slip speed is 100-550 RPM for 10 seconds.

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 commands maximum line pressure.
^ The PCM inhibits TCC engagement.
^ The PCM inhibits 4th gear if the transmission is in hot mode.
^ The PCM freezes transmission adaptive functions from being updated.
^ 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 P0894 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 fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
^ Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input, turbine, shaft for damage.
^ Refer to Symptoms - Automatic Transmission for more information.

Test Description

Step 1 - Step 6:

Step 7 - Step 9:

Step 10 - Step 11:

Step 12 - Step 15:

The number below refers to the step number on the diagnostic table.
3. This step tests the torque converter for slippage while in a commanded lock-up state.