The 1-2 shift solenoid (SS) valve controls the fluid flow action
on the 1-2 and the 3-4 shift valves. The 1-2 SS valve is
a normally open exhaust valve that is used with the 2-3 SS in order to allow
four different shifting combinations.
When the powertrain control module (PCM) detects a 1-1-4-4
gear ratio, then DTC P0752 sets. DTC P0752 is a type C DTC.
For California emissions vehicles DTC P0752 is a type B DTC.
The number below refers to the step number on the diagnostic table.
Step
| Action
| Yes
| No
|
1
| Did you perform the Diagnostic System Check - Engine Controls?
| Go to
Step 2
| Go to
Diagnostic System Check - Engine Controls
in Engine Controls - 4.8L, 5.3L, and 6.0L
|
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 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
Intermittent Conditions
in Engine
Controls - 4.8L, 5.3L, and 6.0L
|
3
|
- Inspect the shift solenoid/hydraulic circuit for the following conditions:
• | 1-2 shift valve stuck in the applied position |
• | A cracked 1-2 shift solenoid |
- Clean and inspect the related valves, bores and the valve body for debris
or contamination restricting oil flow. Refer to
Control Valve Body Cleaning and Inspection
in Transmission Unit Repair Manual.
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 condition, only if
traffic and road conditions permit:
Hold the throttle at 40% and accelerate
to 89 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
in Engine Controls - 4.8L, 5.3L, and 6.0L
| System OK
|