P0752

DTC P0752





Circuit Description
The 1-2 shift solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The 1-2 SS valve is a normally-open exhaust valve that is used with the 2-3 SS valve, in order to allow 4 different shifting combinations.

When the powertrain control module (PCM) detects a 1-1-4-4 shift pattern, then DTC P0752 sets. DTC P0752 is a type B DTC.

DTC Descriptor
This diagnostic procedure supports this DTC:
DTC P0752 1-2 Shift Solenoid (SS) Valve Performance - No Second or Third Gear

Conditions for Running the DTC
^ No TP sensor DTCs P0122 or P0123.
^ No VSS DTCs P0502 or P0503.
^ No TCC solenoid valve DTC P0740.
^ No TCC stuck ON DTC P0742.
^ No 1-2 SS valve DTC P0753.
^ No 2-3 SS valve DTC P0758.
^ No 3-2 SS valve DTC P0785.
^ No TFP manual valve position switch DTC P1810.
^ No TCC PWM solenoid valve DTC P2761.
^ The engine speed is greater than 450 RPM for 5 seconds.
^ The engine is not in fuel cutoff.
^ The gear range is D4.
^ The TP angle is greater than 10 percent.
^ The transmission fluid temperature is 20 - 130°C (68 - 266°F).
^ The system voltage is 10 - 18 volts.
^ The engine torque is 68 - 542 Nm (50 - 400 ft. lbs.).
^ The transmission output speed is 150 RPM or greater.

Conditions for Setting the DTC
DTC P0752 sets if both of these conditions occur twice:

Condition 1
^ The PCM commands second gear for 1 second.
^ The estimated gear ratio is 3.0-3.3.
^ All conditions are met for 2 seconds.

Condition 2
^ The PCM commands third gear for 1 second.
^ The estimated gear ratio is 0.65-0.9.
^ All conditions are met for 3 seconds.

Action Taken When the DTC Sets
^ The PCM illuminates the malfunction indicator lamp (MIL).
^ The PCM commands D2 line pressure.
^ The PCM inhibits 3-2 downshifts if the vehicle speed is greater than 48 km/h (30 mph) or greater.
^ The PCM inhibits fourth gear in hot mode.
^ The PCM freezes shift adapts 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 P0752 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.

Diagnostic Aids
^ Verify that the transmission meets the specifications in the Shift Speed table.
^ Other internal transmission failures may cause more than one shift to occur.
^ Refer to the Shift Solenoid Valve State and Gear Ratio table.

Test Description





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