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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 635 (AUTOMATIC TRANSAXLE DIAGNOSTICS (DTC P1820, 3.4l TO DTC U2105, 3.6L) - 4T65-E) >> Diagnosis >> DTC P1887 (3.4L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests the PCMs ability to recognize a grounded circuit.
  2. 4:  A short to ground in this circuit would set DTC P0742.
  3. 5:  A short to ground in this circuit would set DTC P0742.
DTC P1887 (3.4L)

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 - 3.4L
2
  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
    3. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear DTC Information function will erase the stored Freeze Frame and Failure Records from the PCM.
  3. Record the Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. With the scan tool, observe the TCC Release Pressure parameter.
Does the scan tool indicate Yes for TCC Release Pressure?		 - Go to Step 3  Go to Step 6 
3 
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector. Additional DTCs may set.
  3. Connect the J 44152  jumper harness on the engine side of the 20-way connector.
  4. Using the J 35616  GM terminal test kit, connect a fused jumper wire from the TCC release switch signal circuit to a good ground.

    Refer to Automatic Transmission Inline 20-Way Connector End View (3.4L) or Automatic Transmission Inline 20-Way Connector End View (3.6L) .

  5. Turn ON the ignition with the engine OFF.
  6. Observe the TCC Release Pressure parameter.
Does the scan tool indicate Yes for TCC Release Pressure?		 - Go to Step 4  Go to Step 5 
4  Test the signal circuit of the TCC release switch for an open between the PCM and the AT inline 20-way connector.
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 11  Go to Step 10 
5  Test the signal circuit of the TCC release switch for an open between the AT inline 20-way connector and the TFP manual valve position switch.
Refer to:
Did you find a condition?		 - Go to Step 8  Go to Step 9 
6
  1. Using the scan tool, observe TCC Slip Speed and TCC Release Pressure.
  2. Drive the vehicle with the range selector in D4 until the TCC is applied and slip speed is below 50 RPM.
Does the scan tool indicate Yes for TCC Release Pressure?		 - Go to Step 7  Go to Intermittent Conditions in Engine Controls - 3.4L
7 Inspect for the following conditions of mechanical components and hydraulic circuits that could cause TCC release pressure at the TCC release switch when the TCC is applied:
  • The turbine shaft O-ring seal leaking
  • The turbine shaft oil seal rings missing or damaged

    Refer to Torque Converter Assembly Removal in Transmission Unit Repair article.

  • The TCC control valve damaged

    Refer to Control Valve Body Disassemble (Without Touch Activated Power) Control Valve Body Disassemble (With Touch Activated Power) in Transmission Unit Repair article.

  • The #1 checkball damaged
  • The spacer plate release exhaust blocked with debris

    Refer to Control Valve Body and Spacer Plate Assemble in Transmission Unit Repair article.

  • The case cover or spacer plate gaskets improperly installed

    Refer to Case Cover Removal in Transmission Unit Repair article.


Did you complete the repair?		 - Go to Step 11  -
8 Replace the AT wiring harness assembly.
Refer to Wiring Harness Replacement .
Did you complete the replacement?		 - Go to Step 11  -
9 Replace the TFP manual valve position switch.
Refer to Transmission Fluid Pressure (TFP) Manual Valve Position Switch Replacement .
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the PCM.
Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 3.4L.
Did you complete the replacement?		 - Go to Step 11  -
11 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear DTC Information.
  3. Operate the vehicle under the following conditions:
    • Drive the vehicle in D4 until the transmission shifts into 4th gear and the TCC is commanded ON.
    • Observe TCC release pressure on the scan tool.
    • Ensure that the TCC release pressure status is NO for at least 3 seconds.
  4. Select Specific DTC.
  5. Enter DTC P1887.

Has the test run and passed?		 - Go to Step 12  Go to Step 2 
12 With a 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 - 3.4L System OK
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