P1815

Steps 1-5:

Steps 6-12:

Steps 13-18:

DTC P1815
Circuit Description
The automatic Transmission Fluid Pressure (TFP) manual valve position switch consists of six pressure switches. Five of the switches are normally-open, and determine gear range selection. The sixth switch is normally-closed, and detects Torque Converter Clutch (TCC) release fluid pressure. The TFP manual valve position switch also contains the automatic Transmission Fluid Temperature (TFT) sensor. These components are combined into one unit, attached to the control valve body.

The PCM provides battery voltage on the three range signal circuits. By grounding one or more of the switches with fluid pressure from the manual shift valve, the PCM detects the selected gear range. When you disconnect the transmission electrical connector and the ignition is ON, the ground potential for three range signals from the PCM will be removed, and an invalid gear range will be indicated. Refer to Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic.

When the PCM detects a gear range other than PARK/NEUTRAL indicated at start-up, DTC P1815 sets. DTC P1815 is a type B DTC.

Conditions for Running the DTC
^ No VSS DTCs P0502 or P0503.
^ No ISS DTCs P0716 or P0717.
^ No PSA DTC P1810.
^ The engine speed is in transition from 0 RPM to greater than 600 RPM.
^ The vehicle speed is less than 3 km/h (2 mph).
^ The system voltage is 8-18 volts.

Conditions for Setting the DTC
D2, D4 or REVERSE gear is indicated after start-up for 0.25 second.

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 elevates line pressure.
^ The PCM assumes a D4 shift pattern.
^ The PCM freezes transmission adaptive functions.
^ 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 P1815 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 an4 - 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.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the indicated range signal to the manual valve range actually selected.
6. This step tests for correct voltage from the PCM.