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Home >> Pontiac >> 2004 >> Sunfire Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Automatic Transaxle - 4T40-E/4T45-E Diagnosis (DTC P0748 (3.4L) To P1887)) >> Diagnostic Information and Procedures >> DTC P1887 (3.4L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Am and 2004 Oldsmobile Alero. 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 ability of the PCM to recognize a grounded circuit.
  2. 7:  This step tests for a mechanical or hydraulic condition.
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 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. Select TCC Release Pressure on the scan tool.
Does the scan tool indicate TCC release pressure is present?		 - 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. Install the J 44152  jumper harness (20 pins) on the engine side of the AT inline 20-way connector.
  4. Using the J 35616  GM-approved terminal test kit, connect a fused jumper wire from the TCC release switch signal circuit of the J 44152  to ground.

    Refer to Automatic Transmission Inline 20-Way Connector End View .

  5. Turn ON the ignition, with the engine OFF.
Does the scan tool indicate TCC release pressure is present?		 - Go to Step 4  Go to Step 5 
4 Test the signal circuit of the TCC release switch for an open between the PCM connector C2 and the AT inline 20-way connector.
Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.
Did you find and correct the 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 Testing for Continuity in Wiring Systems.
Did you find the condition?		 - Go to Step 8  Go to Step 9 
6
  1. Use the scan tool snapshot mode in order to record TCC Slip Speed and TCC Release Pressure.
  2. Operate the vehicle under the following conditions:
    • Road test the vehicle with gear select lever in D4.
    • Increase the vehicle speed until the TCC is applied.
    • Ensure that slip speed is less than 60 RPM.
With the TCC applied and slip speed less than 60 RPM does the scan tool indicate TCC release pressure is present?		 - Go to Step 7  Go to Intermittent Conditions in Engine Controls - 3.4L
7 
  1. Inspect for the following conditions:
    • Leaking torque converter O-ring seal (41)
    • Cut torque converter O-ring seal (41)

      Refer to Case and Associated Parts in Component Location .

    • Debris or flash blocking the channel plate (27) at the TCC release exhaust passage (48)

      Refer to Case and Associated Parts in Component Location or Channel Plate Passages in Component Location .

    • Leaking oil pump bearing and seal assembly (200) seal
    • Cut oil pump bearing and seal assembly (200) seal
    • Oil pump bearing and seal assembly (200) installed backwards

      Refer to Oil Pump Cleaning and Inspection in Transmission Unit Repair article.

    • Misaligned valve body to spacer plate gasket (22)
    • Misaligned spacer plate to channel plate gasket (24)
    • Channel plate (27) turbine shaft sleeve installed backwards, or with no press fit
    • Valve body spacer plate (23), release exhaust orifice (46), blocked by debris, valve body to spacer plate gasket (22), or spacer plate to channel plate gasket (24)

      Refer to Control Valve Body Assembly and Gasket Removal in Transmission Unit Repair article.

    • Cut turbine shaft to sprocket seal (33)
    • Missing turbine shaft to sprocket seal (33)

      Refer to Drive, Driven Sprockets and Drive Link Disassemble in Transmission Unit Repair article.

  2. Repair any of the above conditions as necessary.
Did you complete the repair?		 - Go to Step 11  -
8 Replace the automatic transmission wiring harness.
Refer to Wiring Harness Replacement .
Did you complete the repair?		 - 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 repair?		 - 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 Info.
  3. Operate the vehicle under the following conditions:
    • Drive the vehicle in D4 in order to obtain 74 km/h (45 mph).
    • With the TCC commanded ON and engaged, TCC release pressure must not be present for 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 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 - 3.4L System OK
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