P0752

Circuit Description
The 1-2/3-4 Shift Solenoid (SS) valve is a normally closed shift solenoid that controls the positioning of the 1-2/3-4 shift valve. When de-energized (off), the solenoid is closed and blocks D32/1-2 fluid from acting on. the solenoid end of the 1-2/3-4 shift valve. When energized (on), the solenoid opens and D32/1-2 fluid pressure flows through the solenoid, acts on the solenoid end of the shift valve and moves the valve against spring force.

When the TCM detects a 2-2/3-3 shift pattern, then DTC P0752 will set. DTC P0752 is a type B DTC.

Conditions for Running the DTC
^ Transmission is in drive (D).
^ No Transmission Range Switch DTC P0705.
^ No VSS Assembly DTC P0722.
^ No 1-2/3-4 SS Valve DTC P0753.
^ No 2-3 SS Valve DTC P0758.
^ No TCM Internal Watchdog Operation DTC P1600.
^ No TCM Power Control Relay Circuit-Shorted DTC P1625.
^ No TCC Enable Solenoid Circuit - Electrical DTC P0743.
^ No Throttle Position Signal DTC P1890.

All the above conditions must be present, plus one of the following conditions:

Condition 1:
^ The commanded gear is 1st for greater than 1.5 seconds.
^ Throttle position is greater than 41.1%.
^ Engine speed is between 2400-3008 RPM.
^ Transmission output speed is greater than 704 RPM.
^ Engine torque is greater than 50 N.m (68 lb ft).

Condition 2:
^ The commanded gear is 4th for greater than 0.5 seconds.
^ Throttle position is greater than 15%.
^ Engine speed is 1696-4992 RPM.
^ Transmission output speed is greater than 1696 RPM.
^ Engine torque is greater than 50 N.m (68 lb ft).
^ TCC is commanded on.

Conditions for Setting the DTC
DTC P0752 sets if the following conditions occur two times.

Condition 1:
TCC slip speed is between -711 to 350 RPM for 0.6 seconds.

Condition 2:
TCC slip speed is between 666 to 1000 RPM for 5.0 seconds.

Action Taken When the DTC Sets
^ Early production - The TCM illuminates the Service Transmission Lamp (STL) and sends a MIL request to the ECM on the second consecutive drive trip that the diagnostic runs and fails. The ECM then illuminates the MIL.
^ Late production - The TCM flashes the Sport Mode Lamp and sends a MIL request on the second consecutive drive trip that the diagnostic runs and fails. The TCM then illuminates the MIL.
^ The ECM records the operating conditions in the Freeze Frame at the time of the MIL request from the TCM.
^ The transmission operates in the default mode (maximum line pressure, command 4th gear, inhibit TCC, freeze shift adapts).

Conditions for Clearing the MIL/DTC
^ Early production - The TCM turns off the STL as soon as the fault is no longer present.
^ Late production - The TCM stops flashing the sport mode lamp as soon as the fault is no longer present.
^ The ECM turns off the MIL after three consecutive drive trips during which the TCM sends no MIL request.
^ A History DTC clears after forty consecutive warm-up cycles, if no failures are present by this diagnostic or any other emission related diagnostic.
^ The scan tool clears the MIL/DTC.
^ The TCM cancels the DTC default mode actions when the fault no longer exists and the ignition switch is Off long enough in order to power down the TCM.

Diagnostic Aids
^ Vehicles equipped with Fuel Cap Lamps utilize the Sport Mode lamp to indicate a transmission malfunction. in these vehicles, the Sport Mode Lamp flashes at 200 millisecond intervals when the TCM commands the lamp ON.
^ Vehicles not equipped with Fuel Cap Lamps are equipped with a dedicated Service Transmission Lamp (STL) on the instrument Panel Cluster (IPC). The STL illuminates steadily when the TCM commands the lamp ON.
^ Verify that the transmission meets the specifications in the Shift Speeds table.
^ Other internal transmission failures may cause more than one shift to occur.
^ Refer to the Shift Solenoid Valve State table:

Test Description
The number below refers to the step number on the diagnostic table.
2. This step tests that the TCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.