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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0218-P0731)) >> DTC P0561 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 3:  This step observes battery feed.
  2. 4:  This step observes ignition feed.
  3. 7:  This step observes accessories for voltage fluctuations.
DTC P0561

Step Action Value Yes No
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install the 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 for reference. The Clear Info function will erase the data.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Start the engine and observe the charge indicator on the instrument panel cluster (IPC).
Does the charge indicator illuminate or the driver information center (DIC) display a charging system message?		 - Go to Charging System Test Go to Step 3 
3 
  1. Turn the ignition OFF.
  2. Disconnect the 80-way connector at the TCM.
  3. Install the J 39700  breakout box, the J-47275  breakout box adapter and the J 47275-1 magnetic overlay. See Special Tools .
  4. Using the DMM, and in sequence, measure voltage at connector terminals 10 and 70 and ground.
Is voltage within the specified value?		 B+ Go to Step 4  Go to Step 5 
4 
  1. Using the DMM, measure voltage at connector terminal 63 and ground.
  2. Turn ON the ignition, with the engine OFF.
Is voltage within the specified value?		 B+ Go to Step 7  Go to Step 6 
5 Test the battery positive voltage circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Diagnostic Aids
6 Test the ignition feed circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
7 
  1. Start the engine.
  2. Operate all accessories. Refer to Checking Aftermarket Accessories .
Did voltage fluctuate by the specified amount?		 4 V Go to Step 8  Go to Step 9 
8 Determine the cause of the accessory voltage drop. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Diagnostic Aids
9
IMPORTANT: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
Replace the TCM. Refer to Control Module References for replacement, setup, and programming.Did you complete the replacement?		 - Go to Step 10  -
10 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Using the scan tool, monitor TCM voltage.
  3. Select Specific DTC.
  4. Enter DTC P0561.

Has the test run and passed?		 - Go to Step 11  Go to Step 2 
11 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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