P0753

DTC P0753

Schematic:

Circuit Description
The 1-2 Shift Solenoid (SS) valve controls fluid flow acting on the 1-2 shift valve. The solenoid is a normally-open valve that, in conjunction with the 2-3 Shift Solenoid (SS) valve, allows four different shifting combinations. The 1-2 SS valve is attached to the control valve body, within the transmission.
The solenoid receives ignition voltage through the fused power feed circuit. The PCM commands the solenoid ON or OFF by providing a ground path.
When the PCM detects a continuous open, short to ground, or short to voltage in the 1-2 SS valve circuit, then DTC P0753 sets. DTC P0753 is a type A DTC.

Conditions for Running the DTC
- The ignition switch is in the ON position.
- The system voltage is 8 - 18 volts.

Conditions for Setting the DTC
- One of the following conditions occurs for 4.3 seconds:
- The PCM commands the solenoid ON, and the voltage feedback remains high, B+.
- The PCM commands the solenoid OFF, and the voltage feedback remains low, 0 volts.

Action Taken When the DTC Sets
- The PCM illuminates the Malfunction Indicator Lamp (MIL).
- The PCM commands maximum line pressure.
- The PCM inhibits TCC engagement.
- The PCM inhibits 3-2 downshifts above 56 km/h (35 mph).
- The PCM freezes transmission adapt 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 P0753 in PCM history.

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.

Test Description

Steps 1-8:

Steps 9-18:

19-26:

The numbers below refer to the step numbers on the diagnostic table.
8. This step tests the electrical operation of the solenoid.
9. This step tests the PCM and the wiring to the transmission.
17. This step verifies that the circuit has the correct resistance.