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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P1810 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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 compares the indicated range signal to the selected manual valve position.
  2. 5:  This step tests for correct voltage from the PCM to the AT inline 20-way connector.
DTC P1810

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Inspect for correct transmission fluid level. Refer to Transmission Fluid Checking .
Did you perform the fluid checking procedure?		 - Go to Step 3  Go to Transmission Fluid Checking
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. Start the engine and idle at normal operating temperature.
  6. Apply the brake pedal.
  7. Select each transmission range: P, R, N, D4, D3, D2 and D1.
Does each selected transmission range match the scan tool TFP Sw. display?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector, additional DTCs may set.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool TFP Sw. A/B/C parameter indicate HI for all range signal states?		 - Go to Step 5  Go to Step 9 
5 
  1. Turn OFF the ignition.
  2. Install the J 44152  Jumper Harness (20 pins) on the engine side of the AT inline 20-way connector. See Special Tools .
  3. Turn ON the ignition, with the engine OFF.
  4. Using the DMM and the J 35616  GM Terminal Test Kit, measure the voltage from the transmission fluid pressure switch signal A circuit of the J 44152  to ground. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
  5. Measure the voltage from the transmission fluid pressure switch signal B circuit of the J 44152  to ground. See Special Tools .
  6. Measure the voltage from the transmission fluid pressure switch signal C circuit of the J 44152  to ground. See Special Tools .
Does the voltage measure within the specified range at all three terminals?		 10-12 V Go to Step 6  Go to Step 10 
6 Connect a fused jumper wire from the transmission fluid pressure switch signal A circuit of the J 44152  , to ground while monitoring the scan tool TFP Sw. See Special Tools . A/B/C parameter.
When the transmission fluid pressure switch signal A circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 11  Go to Step 7 
7 Connect a fused jumper wire from the transmission fluid pressure switch signal B circuit of the J 44152  , to ground while monitoring the scan tool TFP Sw. See Special Tools . A/B/C parameter.
When the transmission fluid pressure switch signal B circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 11  Go to Step 8 
8 Connect a fused jumper wire from the transmission fluid pressure switch signal C circuit of the J 44152  , signal circuit C, to ground while monitoring the scan tool TFP Sw. See Special Tools . A/B/C parameter.
When the transmission fluid pressure switch signal C circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 11  Go to Step 12 
9 Test the signal circuits of the TFP manual valve position switch that did not indicate HI for a short to ground between the PCM and the AT inline 20-way connector. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
10 Test the signal circuits of the TFP manual valve position switch that did not indicate ignition voltage for an open between the PCM and the AT inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
11 Test the affected signal circuits of the TFP manual valve position switch for a shorted together condition between the PCM and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
12 Test the signal circuits of the TFP manual valve position switch for an open or shorted condition between the TFP manual valve position switch and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs .
Did you find a condition?		 - Go to Step 13  Go to Step 14 
13 Replace the AT wiring harness assembly. Refer to Valve Body and Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 16  -
14 Replace the TFP manual valve position switch. Refer to Valve Body and Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the PCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 16  -
16 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:
    1. Turn ON the ignition, with the engine OFF for at least 2 seconds.
    2. Start the vehicle and idle for 5 seconds.
    3. Drive in D4 until the TCC locks for 10 seconds.
    4. Continue to run the engine for at least 60 seconds from startup.
  4. Select Specific DTC.
  5. Enter DTC P1810.

Has the test run and passed?		 - Go to Step 17  Go to Step 2 
17 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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