Step
| Action
| Value(s)
| Yes
| No
|
1
| Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
| --
|
Go to Step 2
| Go to A Powertrain On Board Diagnostic (OBD) System Check
|
2
| Have
you performed the transmission fluid checking procedure?
| --
|
Go to Step 3
| Go to
Transmission Fluid Check
|
3
|
- Install the Scan Tool
®.
- Turn the ignition switch to the Run position.
- The engine is not running.
Important: Use the scan tool to record the failure records, because when you clear
the DTCs, the Clear Info function will erase this data.
- Record P1811 failure records.
Are any of the following DTCs set: P0120, P0121, P0122, P0123, P1121,
P1122, P1524, P0502, P0503, P0711, P0712 or P0218?
| --
|
Go to Step 4
|
Go to Step 5
|
4
| Diagnose those DTCs first.
Is the diagnosis and repair complete?
| --
|
Go to Step 14
| --
|
5
|
- Use the scan tool snapshot mode in order to record the shift times.
- Drive the vehicle in D4 in order to obtain a 1-2, a 2-3, and 3-4
upshift.
- Record the shift times.
Did all the shift times exceed the specified value?
| 0.65 seconds
|
Go to Step 6
|
Go to Step 8
|
6
| Perform the line
pressure check.
Refer to
Line Pressure Check
.
Is the line pressure within specifications
| --
| Go to Diagnostic Aids
|
Go to Step 7
|
7
| Inspect the transmission for the following conditions:
• | Low fluid level caused by external leaks |
• | Out-of-position fluid filter |
• | Internal fluid passage leaks |
• | Casting porosity or damage |
• | Damaged gasket or spacer plate |
• | Out-of-position gasket or spacer plate |
• | Contaminated PC Sol. Valve |
• | Damaged PC Sol. Valve |
• | Stuck pressure regulator valve train |
• | Leaking pressure regulator valve train |
• | Stuck torque signal valve train |
• | Leaking torque signal valve train |
• | Inadequate oil pump suction |
Refer to
Transmission Overhaul
, in Unit Repair.
Did you find and correct the condition?
| --
|
Go to Step 14
| --
|
8
| Did the 1-2 shift time exceed
the specified value?
| 0.65 seconds
|
Go to Step 9
|
Go to Step 10
|
9
|
- Inspect the 1-2 shift circuit for the following conditions:
• | Leaking 1-2 accumulator piston seals |
• | Rolled 1-2 accumulator piston seals |
• | Cut 1-2 accumulator piston seals |
• | Leaking 2nd clutch piston seals |
• | Rolled 2nd clutch piston seals |
• | Cut 2nd clutch piston seals |
• | Burned 2nd clutch plates |
• | Damaged 2nd clutch plates |
• | Broken 2nd clutch springs |
• | Out-of-position 2nd clutch springs |
• | Damaged 2nd clutch pistons |
• | Leaking driven sprocket support seals |
• | Damaged driven sprocket support seals |
• | Internal fluid passage leaks |
• | Casting porosity or damage |
• | Damaged gasket or spacer plate |
• | Out-of-position gasket or spacer plate |
• | Slipping forward clutch |
• | Damaged sprag clutch (not holding) |
• | 2nd roller clutch damaged (not holding) |
- Repair the 1-2 shift circuit.
Refer to
Transmission Overhaul
, in Unit Repair.
Did you find and correct the condition?
| --
|
Go to Step 14
| --
|
10
| Did the 2-3 shift
time exceed the specified value?
| 0.65 seconds
|
Go to Step 11
|
Go to Step 12
|
11
|
- Inspect the 2-3 shift circuit for the following conditions:
• | Leaking 2-3 accumulator piston seals |
• | Rolled 2-3 accumulator piston seals |
• | Cut 2-3 accumulator piston seals |
• | Leaking direct clutch piston seals |
• | Rolled direct clutch piston seals |
• | Cut direct clutch piston seals |
• | Burned direct clutch plates |
• | Damaged direct clutch plates |
• | Broken direct clutch springs |
• | Out-of-position direct clutch springs |
• | Damaged direct clutch pistons |
• | Leaking driven sprocket support seals |
• | Damaged driven sprocket support seals |
• | Damaged driven sprocket support |
• | Damaged sprag clutch (not holding) |
• | Internal fluid passage leaks |
• | Casting porosity or damage |
• | Damaged gasket or spacer plate |
• | Out-of-position gasket or spacer plate |
- Repair the 2-3 shift circuit.
Refer to
Transmission Overhaul
, in Unit Repair.
Did you find and correct the condition?
| --
|
Go to Step 14
| --
|
12
| Did the 3-4 shift
time exceed the specified value?
| 0.65 seconds
|
Go to Step 13
| --
|
13
|
- Inspect the 3-4 shift circuit for the following conditions:
• | Leaking 3-4 accumulator piston seals |
• | Rolled 3-4 accumulator piston seals |
• | Cut 3-4 accumulator piston seals |
• | Leaking intermediate/4th servo piston seals |
• | Rolled intermediate/4th servo piston seals |
• | Cut intermediate/4th servo piston seals |
• | Burned intermediate/4th band |
• | Out-of-position intermediate/4th band |
• | Damaged intermediate/4th band |
• | Slipping intermediate/4th band |
• | Internal fluid passage leaks |
• | Casting porosity or damage |
• | Damaged gasket or spacer plate |
• | Out-of-position gasket or spacer plate |
• | Slipping direct clutch |
• | Damaged intermediate/4th servo pin |
• | Seized intermediate/4th servo pin |
• | Damaged intermediate/4th servo piston |
• | Cracked intermediate/4th servo cover |
• | Leaking intermediate/4th servo cover |
- Repair the 3-4 shift circuit.
Refer to
Transmission Overhaul
, in Unit Repair.
Did you find and correct the condition?
| --
|
Go to Step 14
| --
|
14
| In order to verify
your repair, perform the following procedure:
- Select DTC.
- Select Clear Info.
- Operate the vehicle under the following conditions:
• | Drive the vehicle in D4 in order to obtain 1-2, 2-3, and 3-4 upshifts. |
• | Shift times must be less than 0.65 seconds. |
- Select Specific DTC. Enter DTC P1811.
Has the test run and passed?
| --
| System
OK
|
Begin the diagnosis again. Go to Step 1
|