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 and
vehicles under 8600 GVW, DTC P0752 is a type B DTC.
The numbers below refer to the step numbers on the diagnostic table.
DTC P0752
Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the Powertrain Diagnostic System Check?
| --
|
Go to Step 2
| Go
to
Diagnostic System Check - Engine Controls
(6.0 L) or
Diagnostic System Check - Engine Controls
(8.1 L) in Engine Controls
|
2
|
- Install a Scan Tool
.
- Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTCs, 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 Freeze Frame and Failure Records.
- Clear the DTCs.
- Select TFP switch A/B/C on the scan tool.
- With the engine operating, apply the brake pedal, and select each
transmission range: D1, D2, D3, D4, N, R, and P.
Refer to
Transmission Fluid Pressure Manual Valve Position Switch Logic
.
Does each selected transmission range match the scan tool TFP switch
display?
| --
|
Go to Step 3
| Go to
DTC P1810
|
3
|
- Raise and support the drive axle assembly.
- Start the engine.
- With the transmission in D4 range, use the scan tool in order
to command FIRST, SECOND, THIRD, and FOURTH gears while accelerating the
vehicle. The vehicle may need to be road tested.
Was a 1-1-4-4 shift pattern only detected?
| --
|
Go to Step 4
| Go to Diagnostic Aids
|
4
|
- Inspect the shift solenoid/hydraulic circuit for a 1-2 SS valve
internal malfunction.
- Inspect the shift solenoid/hydraulic circuits for a stuck 1-2
or 3-4 shift valve.
- Inspect the shift solenoid/hydraulic circuit for damaged seals
on one or both of the shift solenoids. The shift solenoids can cause oil
to leak into the second gear clutch pack.
Refer to
Symptoms - Automatic Transmission
.
Did you find and correct the condition?
| --
|
Go to Step 5
| Go to Diagnostic Aids
|
5
| Perform
the following procedure in order to verify the repair:
- Select DTC.
- Select Clear Info.
- Operate the vehicle under the following conditions, if traffic
and road conditions permit:
• | Accelerate the vehicle with the TP angle greater than 7%
up to 89 km/h (55 mph). |
• | The PCM must see the proper ratio for each commanded gear for
greater than one second in D1, D2, D3, and D4. |
- Select Specific DTC.
- Enter DTC P0752.
Has the test run and passed?
| --
| System OK
|
Go to Step
1
|