DTC P0752 4.2L
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 the following DTC:
DTC P0752 1-2 Shift Solenoid Valve Performance - No Second or Third Gear
Conditions for Running the DTC
| • | 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 TP sensor DTCs P1120 or P1220. |
| • | No TFP manual valve position switch DTC P1810. |
| • | No TCC PWM solenoid valve DTC P1860. |
| • | The engine speed is greater than 450 RPM for 5 seconds. |
| • | The engine is not in fuel cutoff. |
| • | The TP angle is 10 percent or greater. |
| • | The transmission fluid temperature is 20-130°C (68-266°F). |
| • | The system voltage is 10-18 volts. |
| • | The transmission output speed is 150 RPM or greater. |
| • | The transfer case ratio in 4WD Low is 0.9-1.2. |
| • | The transfer case ratio in 4WD High is 2.6 to 2.85. |
Conditions for Setting the DTC
DTC P0752 sets if both of the following conditions occur twice:
Condition 1
| • | The PCM commands second gear for 1 second. |
| • | The torque converter efficiency is greater than or equal to 0.5. |
| • | The estimated gear ratio is 3.0-3.3. |
| • | The engine torque is 34-542 N·m (25-400 lb ft). |
| • | All conditions are met for 2 seconds. |
Condition 2
| • | The PCM commands third gear for 1 second. |
| • | The torque converter efficiency is greater than or equal to 0.5. |
| • | The estimated gear ratio is 0.65-0.9. |
| • | The engine torque is 68-542 N·m (50-400 lb ft). |
| • | All conditions are met for 3 seconds. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) 2nd trip. |
| • | 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 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 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 fault no longer exists
and/or 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. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.
DTC P0752 (4.2L)
Step
| Action
| Yes
| No
|
1
| Did you perform the Diagnostic System Check - Vehicle?
| Go to
Step 2
| Go to
Diagnostic System Check - Vehicle
in Vehicle DTC Information
|
2
|
- Install a scan tool.
- Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the powertrain control module (PCM).
- Record the DTC Freeze Frame and Failure Records.
- Clear the DTC.
- Drive the vehicle in D4 range under the following conditions:
Accelerate the vehicle, ensuring that the PCM commands 1st, 2nd, 3rd, and 4th gears.
Did you detect a 1-1-4-4 shift pattern?
| Go to
Step 3
| Go to
Testing for Intermittent Conditions and Poor Connections
in Wiring Systems
|
3
| Inspect the shift solenoid/hydraulic circuit for the following conditions:
| • | An internal malfunction |
| • | Damaged seals on the shift solenoid valve |
Did you find and correct the condition?
| Go to
Step 4
| --
|
4
| Perform the following procedure in order to verify the repair:
- Select DTC.
- Select Clear Info.
- Drive the vehicle in D4 range under the following conditions, only if traffic and road conditions permit:
Hold the throttle at 20 percent and accelerate to 88 km/h (55 mph).
- Select Specific DTC.
- Enter DTC P0752.
Has the test run and passed?
| Go to
Step 5
| Go to
Step 2
|
5
| With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?
| Go to
Diagnostic Trouble Code (DTC) List - Vehicle
in Vehicle DTC Information
| System OK
|
DTC P0752 5.3L
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 transmission control module (TCM) 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 the following DTC:
DTC P0752 1-2 Shift Solenoid Valve Performance - No Second or Third Gear
Conditions for Running the DTC
| • | No OSS DTCs P0722 or P0723. |
| • | No TCC performance DTC P0742 or P0894. |
| • | No shift solenoid electrical DTCs P0973, P0974, P0976, or P0977. |
| • | Ignition voltage between 8-18 volts. |
| • | The engine run time is greater than 5 seconds. |
| • | The engine torque is greater than 50 N·m (37 lb ft). |
| • | The transmission fluid temperature is 20-130°C (68-266°F). |
| • | The throttle position is 10 percent or greater. |
| • | The output shaft speed is 150 RPM or greater. |
Conditions for Setting the DTC
Condition 1
| • | The TCM commands second gear. |
| • | The estimated gear ratio is 2.88:1-3.33:1. |
| • | All conditions are met for 2.25 seconds. |
Condition 2
| • | The TCM commands third gear. |
| • | The estimated gear ratio is 0.30:1-0.8:1. |
| • | All conditions are met for 3 seconds. |
Action Taken When the DTC Sets
| • | The TCM requests the ECM to illuminate the malfunction indicator lamp
(MIL) during the second consecutive trip in which the Conditions for Setting the DTC
are met. |
| • | The TCM commands maximum line pressure. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM inhibits 3-2 downshifts if the vehicle speed
is greater than 40 km/h (25 mph). |
| • | At the time of the first failure, the TCM records the operating conditions
when the Conditions for Setting the DTC are met. The TCM stores this information as
a Failure Record. |
| • | At the time of the second failure, the ECM records the operating conditions
when the Conditions for Setting the DTC are met. The ECM stores this information as
a Freeze Frame. |
| • | The TCM stores DTC P0752 in TCM history during the second consecutive
trip in which the Conditions for Setting the DTC are met. |
Conditions for Clearing the DTC
| • | The ECM turns OFF the MIL after the 4th consecutive drive trip in which
the TCM does not send a MIL illumination request. |
| • | A scan tool can clear the DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up
cycles without a non-emission related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the ignition is OFF long
enough in order to power down the TCM. |
Diagnostic Aids
| • | If you clear DTC P0752, and then cannot reset DTC P0752,
the following conditions may exist: |
| - | Restricted fluid circuits |
Test Description
The number below refers to the step number on the diagnostic table.
-
This step tests that the TCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.
DTC P0752
Step
| Action
| Yes
| No
|
1
| Did you perform the Diagnostic System Check - Vehicle?
| Go to
Step 2
| Go to
Diagnostic System Check - Vehicle
|
2
|
- Install a scan tool.
- Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the transmission control module (TCM).
- Record the DTC Freeze Frame and Failure Records.
- Clear the DTC.
- Drive the vehicle in D4 range under the following conditions:
Accelerate the vehicle, ensuring that the TCM commands 1st, 2nd, 3rd, and 4th gears.
Did you detect a 1-1-4-4 shift pattern?
| Go to
Step 3
| Go to Diagnostic Aids
|
3
| Inspect the shift solenoid/hydraulic circuit for the following conditions:
| • | An internal malfunction |
| • | Damaged seals on the shift solenoid valve |
Did you find and correct the condition?
| Go to
Step 4
| --
|
4
| Perform the following procedure in order to verify the repair:
- Select DTC.
- Select Clear Info.
- Drive the vehicle in D4 range under the following conditions, only if traffic and road conditions permit:
Hold the throttle at 20 percent and accelerate to 88 km/h (55 mph).
- Select Specific DTC.
- Enter DTC P0752.
Has the test run and passed?
| Go to
Step 5
| Go to
Step 2
|
5
| With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?
| Go to
Diagnostic Trouble Code (DTC) List - Vehicle
| System OK
|
