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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1508 (Automatic Transmission, 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2761)) >> Diagnosis >> DTC P0894 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  This step tests the torque converter for slippage while in a commanded lock-up state.
DTC P0894

Step Action Value(s) 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
2 Inspect for correct transmission fluid level.
Refer to Transmission Fluid Checking Procedure .
Did you perform the fluid checking procedure?		 - Go to Step 3  Go to Transmission Fluid Checking Procedure
3 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. 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.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
    5. IMPORTANT: It may be necessary to allow multiple TCC cycles to occur in order to verify a slipping condition. It may also be necessary to ensure the transmission is warm before performing this step.
  5. Drive the vehicle in 4th gear with the TCC commanded ON.
Does the scan tool TCC Slip Speed measure within the specified range for 7 seconds?		 130-800 RPM Go to Step 4  Go to Diagnostic Aids
4
  1. Inspect the torque converter clutch (TCC) solenoid valve for the following conditions:
  2. Inspect the torque converter clutch pulse width modulation (TCC PWM) solenoid valve for the following conditions:
Did you find and correct the condition?		 - Go to Step 14  Go to Step 5 
5
  1. Inspect the 1-2 shift solenoid (SS) valve for the following conditions:
  2. Inspect the 2-3 shift solenoid (SS) valve for the following conditions:
  3. Inspect the 3-2 shift solenoid valve assembly for the following conditions:
Did you find and correct the condition?		 - Go to Step 14  Go to Step 6 
6 Inspect the valve body assembly for the following conditions:
  • Stuck regulator apply valve
  • Scored regulator apply valve body

    Refer to Control Valve Body Disassemble in the 4L60-E section of the Transmission Unit Repair Manual.


Did you find and correct the condition?		 - Go to Step 13  Go to Step 7 
7 Inspect the torque converter assembly for the following conditions:
  • Front stator shaft bushing for wear
  • Stator roller clutch not holding
  • External damage/leaks

    Refer to Torque Converter End Play Inspection in the 4L60-E section of the Transmission Unit Repair Manual.


Did you find and correct the condition?		 - Go to Step 13  Go to Step 8 
8 Inspect the oil pump assembly for the following conditions:
  • A stuck converter clutch valve
  • The converter clutch valve is assembled backwards
  • A mispositioned converter clutch valve retaining ring
  • A cocked converter clutch outer valve spring
  • A mispositioned pump to case gasket
  • Restricted orifice cup plugs
  • Damaged orifice cup plugs
  • Over-tightened, or unevenly tightened pump body to cover bolts

Refer to Oil Pump Cover Disassemble in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 9 
9 Inspect the input housing and shaft assembly for the following conditions:
  • Cut turbine shaft O-ring seal
  • Damaged turbine shaft O-ring seal
  • Restricted turbine shaft retainer and ball assembly
  • Damaged turbine shaft retainer and ball assembly

Refer to Input Housing and Shaft Assembly Inspection in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
10
  • Inspect the 2-4 band assembly for the following conditions:
    • Worn 2-4 band
    • Damaged 2-4 band
    • Mispositioned 2-4 band
    • Misassembled 2-4 band
    • The band anchor pin is not engaged

      Refer to 2-4 Band Assembly Installation in the 4L60-E section of the Transmission Unit Repair Manual.

  • Inspect the 2-4 servo assembly for the following conditions:
    • Restricted apply passages in the 2-4 servo assembly
    • Blocked apply passages in the 2-4 servo assembly
    • Nicks or burrs on the 2nd apply piston pin
    • Damaged 2nd apply piston pin
    • Incorrect 2nd apply piston pin
    • Nicks or burrs on the pin bore in the case
    • Damaged fourth servo piston
    • Misassembled fourth servo piston
    • Damaged servo bore in the case
    • Missing piston seals
    • Cut piston seals
    • Damaged piston seals
    • Porosity in the pistons
    • Porosity in the cover
    • Porosity in the case
    • Damaged piston seal grooves
    • Plugged orifice cup plug
    • Missing orifice cup plug
Refer to 2-4 Servo Disassemble , 2-4 Servo Pin Length Check and 2-4 Servo Assembly Installation in the 4L60-E section of the Transmission Unit Repair Manual.Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
11 Inspect the forward clutch assembly for the following conditions:
  • Worn clutch plates
  • Porosity in the forward clutch piston
  • Damaged forward clutch piston
  • Missing forward clutch piston inner and outer seals
  • Cut forward clutch piston inner and outer seals
  • Damaged forward clutch piston inner and outer seals
  • Missing input housing to forward clutch housing O-ring seal
  • Cut input housing to forward clutch housing O-ring seal
  • Damaged input housing to forward clutch housing O-ring seal
  • Damaged forward clutch housing
  • Damaged forward clutch housing retainer and ball assembly
  • Forward clutch housing retainer and ball assembly is not sealing

Refer to Forward Clutch Assembly Assemble in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
12 Inspect the 3-4 clutch assembly for the following conditions:
  • Worn clutch plates
  • Porosity in the 3-4 clutch piston
  • Damaged 3-4 clutch piston
  • Missing 3-4 clutch inner and outer seals
  • Cut 3-4 clutch inner and outer seals
  • Damaged 3-4 clutch inner and outer seals
  • Damaged 3-4 clutch spring assembly
  • Damaged 3-4 clutch apply ring
  • Damaged piston seal grooves
  • Plugged orifice cup plug
  • Missing orifice cup plug

Refer to 3-4 Clutch Assemble and 3-4 Clutch Plate Travel Check in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Intermittent Conditions in Engine Controls
13
  1. Change the AT fluid and filter.
  2. Inspect for correct transmission fluid level.

    Refer to Transmission Fluid Checking Procedure .

  3. Add new AT fluid as necessary.
    4. IMPORTANT: The Clear TAPS function will clear all adapt cells. This may affect transmission performance. The PCM will update the transmission adapt cell values as the vehicle is driven.
  4. Using the scan tool, perform the Clear TAPS function.
Did you complete the above procedure?		 - Go to Step 14  -
14 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    • Drive the vehicle in D4, with the TCC ON, and a throttle position at 20%.
    • Ensure that the scan tool TCC Slip Speed is -20 to +50 RPM for at least 7 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0894.

Has the test run and passed?		 - Go to Step 15  Go to Step 2 
15 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 System OK
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