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Test Description

WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. 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 indicated range signal to the actual selected range. A faulty TFP manual valve position switch could set DTC P1810.
  2. 4:  This step tests for proper ratios in each commanded gear state.
DTC P0730

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Checking Procedure .
Did you perform the Transmission 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 DTCs, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM.
  3. Record the DTC Failure Records.
  4. Clear the DTCs.
  5. Start the engine.
  6. Apply the parking brake, and select each transmission range: D1, D2, D3, D4, N, R, and P.
Refer to Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic .Does the scan tool TFP switch A/B/C display match each selected gear range?		 - Go to Step 4  Go to DTC P1810 
4
  1. Drive the vehicle in D3 with the throttle position (TP) sensor above 15%.
  2. Operate the vehicle above 11 km/h (7 mph) for greater than 2 seconds in each specified gear range.
  3. Use the scan tool snapshot mode to record the transmission gear ratio for each commanded gear range: REVERSE, 1st, 2nd, and 3rd.
Are the commanded gear ratios within the values for each specified gear range?		 Reverse: 2.05:1 to 2.12:1
1st: 2.43:1 to 2.51:1
2nd: 1.44:1 to 1.51:1
3rd: 0.97:1 to 1.03:1		 Go to Diagnostic Aids  Go to Step 5 
5
  1. Connect the J 21867  pressure gage to the transmission line pressure tap.
  2. Perform the Line Pressure Check Procedure. Refer to Line Pressure Check Procedure .
Is the line pressure within specifications for each selected gear range?		 - Go to Step 6  Go to Symptoms - Automatic Transmission
6
  1. Inspect for excessive clutch wear. Refer to Clutch Plate Diagnosis .
  2. Repair the condition as necessary. Refer to DIRECT CLUTCH ASSEMBLY DISASSEMBLE , FORWARD CLUTCH ASSEMBLY DISASSEMBLE , FOURTH CLUTCH ASSEMBLY DISASSEMBLE and OVERRUN CLUTCH ASSEMBLY DISASSEMBLE .
Did you complete the repair?		 - Go to Step 8  Go to Step 7 
7
  1. Change the AT fluid and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
    2. IMPORTANT: The Clear TAP function will clear all adapt cells. This may affect transmission performance. The PCM will update the adapt cell values as the vehicle is driven.
  2. Use the scan tool in order to perform the Clear TAP function.
Did you complete the above procedure?		 - Go to Step 8  -
8 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 REVERSE, 1st, 2nd, and 3rd gear.
    • The PCM must see valid gear ratios for the commanded gear.
  4. Select Specific DTC.
  5. Enter DTC P0730.

Has the test run and passed?		 - Go to Step 9  Go to Step 2 
9 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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