The 2-3 shift solenoid (SS) valve controls the fluid flow acting on
the 2-3 shift valves. The 2-3 SS valve is a normally-open exhaust valve
that is used with the 1-2 SS valve, in order to allow four different
shifting combinations.
When the PCM detects a 4-3-3-4 shift pattern, then DTC P0756
sets. DTC P0756 is a type A DTC.
The numbers below refer to the step numbers on the diagnostic table.
DTC P0756
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
in Engine Controls - 4.3L or
Diagnostic System Check - Engine Controls
in Engine Controls - 4.8L, 5.3L and 6.0L
|
2
|
- With 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 4-3-3-4 shift pattern?
| --
| Go to
Step 3
| Go to Diagnostic Aids
|
3
|
- Inspect the shift solenoid/hydraulic circuit for the following
conditions:
• | Debris or chips in the AFL oil passage. |
• | Debris or chips restricting oil flow in passage #29 of the case
or through the spacer plate gasket into the valve body. |
• | A cracked 2-3 shift solenoid. |
• | A 2-3 shift valve which is stuck or hung up in the valve
body bore. |
• | A 2-3 shuttle valve which is stuck or hung up in its bore. |
• | Damaged seals on the shift solenoid valves. |
- Clean and inspect the related valves, bores and the valve body
for debris or contamination.
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 64 km/h (40 mph).
- Select Specific DTC.
- Enter DTC P0756.
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 - 4.3L or
Diagnostic Trouble Code (DTC) List
in Engine Controls - 4.8L, 5.3L and 6.0L
| System OK
|