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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1576 (Automatic Transaxle - 4T45-E - DTC P0843 To DTC P2637) >> DTC P1816 (2.2L) >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. 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 integrity of the engine harness and the TCM by checking for the Signal B state change from HI to LOW. A LOW signal indicates the fault is either in the internal transmission harness or the switch. A HI signal indicates the fault is either in the engine harness or the TCM.
DTC P1816

Step Action Yes No
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
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 Failure Records. Using the Clear DTC Information function erases the Failure Records from the TCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Select TFP Sig. B/Sig. C parameter on the scan tool.
  6. Place the range selector in D4.
Does the scan tool TFP Sig. B/Sig. C parameter indicate HI for both?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections
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. See Special Tools .
  4. Using the J 35616  GM terminal test kit, connect a fused jumper wire from the TFP signal B circuit of the J 44152  to ground. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
  5. Turn ON the ignition, with the engine OFF.
  6. Select the TFP Sig. B/Sig. C parameter.
Does the TFP Sig. B indicate LOW?		 Go to Step 5  Go to Step 4 
4 Test the TFP signal B circuit of the TFP manual valve position switch for an open between the TCM and the AT inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct a condition?		 Go to Step 9  Go to Step 8 
5 Test the TFP signal B circuit of the TFP manual valve position switch for an open between the AT inline 20-way connector and the TFP manual valve position switch. Refer to Testing for Continuity .
Did you find and correct a condition?		 Go to Step 6  Go to Step 7 
6 Replace the automatic transmission wiring harness. Refer to Wiring Harness Replacement .
Did you complete the replacement?		 Go to Step 9  -
7 Replace the TFP manual valve position switch. Refer to Transmission Fluid Pressure Manual Valve Position Switch Replacement .
Did you complete the replacement?		 Go to Step 9  -
8 Replace the TCM. Refer to Control Module References for replacement, setup, and programming.
Is the replacement complete?		 Go to Step 9  -
9 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear DTC Information.
  3. Start and idle the engine in PARK for 5 seconds.
  4. Select the TFP Sig. B/Sig. C parameter on the scan tool.
  5. Move the range selector from PARK to D4.
  6. Ensure that the TFP signal B changes from HI to LOW.
  7. Select Specific DTC.
  8. Enter DTC P1816.

Has the test run and passed?		 Go to Step 10  Go to Step 2 
10 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 - Vehicle System OK
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