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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1077 (Automatic Transmission - ALLISON, Diagnosis (DTC P0873 To DTC P2810)) >> Diagnosis >> DTC P2810 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 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. 2:  This step tests ignition voltage.
  2. 3:  This step tests the command signal from the TCM.
  3. 4:  This step tests the resistance value of the external harness and solenoid.
  4. 5:  This step tests the resistance value of the solenoid, and tests the internal wiring harness for open/shorts.
  5. 6:  This step tests the resistance value of the solenoid.
DTC P2810

Step Action Value Yes No
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Automatic Transmission? - Go to Step 2  Go to Diagnostic System Check - Automatic Transmission
2 
  1. Install the scan tool.
  2. Start the engine.
    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 Record Records.
  4. Clear the DTC.
  5. Using the scan tool, observe ignition voltage.
Is the voltage within the specified range?		 9-18 V Go to Step 3  Go to DTC P0562 for low voltage or DTC P0563 for high voltage
3 
  1. Turn the ignition OFF.
  2. Disconnect the C2 connector (RED) at the TCM.
  3. Install the J 39700  breakout box and the J 43799  breakout box adapter.
  4. Using a DMM, measure voltage between connector C2 terminal 30 and terminal 32.
  5. Turn the ignition ON, with the engine OFF.
  6. Using the scan tool, command G solenoid to ON.
Is the voltage within the specified range when G solenoid is commanded ON.		 B+ Go to Step 4  Go to Step 10 
4 
  1. Turn the ignition OFF.
  2. Using a DMM, measure the resistance between connector C2 terminal 30 and terminal 32.
Is the resistance reading within the specified range?		 22.0 ohm @ 20°C (68°F) Go to Diagnostic Aids Go to Step 5 
5 
  1. Turn the ignition OFF.
  2. Connect the C2 connector (RED) at the TCM.
  3. Disconnect the wiring harness from the transmission 20-way connector.
  4. Using a DMM, measure resistance on the transmission side of the 20-way connector terminals R and S.
Is the resistance within the specified range?		 22.0 ohm @ 20°C (68°F) Go to Step 6  Go to Step 7 
6  Inspect the engine wiring harness circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 11  -
7
  1. Connect the transmission 20-way connector.
  2. Remove the oil pan. Refer to Oil Pan Replacement .
  3. Remove the AT internal wiring harness at G solenoid connector.
  4. Using a DMM, measure the resistance of G solenoid.
Is the solenoid resistance within the specified value?		 22.0 ohm @ 20°C (68°F) Go to Step 8  Go to Step 9 
8 Replace the AT internal wiring harness. Refer to Wiring Harness Replacement .
Did you complete the replacement?		 - Go to Step 11  -
9 Replace G solenoid. Refer to Control Valve Solenoid Replacement (Solenoid A, B) or Control Valve Solenoid Replacement (Solenoid C, D, E, F, G) .
Did you complete the replacement?		 - Go to Step 11  -
10
IMPORTANT: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
Replace the TCM. Refer to Transmission Control Module (TCM) Replacement .Did you complete the replacement?		 - Go to Step 11  -
11 Perform the following procedure in order to verify the repair:
  1. Clear the DTC.
  2. Drive the vehicle under normal operating conditions.
  3. Select Specific DTC.
  4. Enter DTC P2810.

Has the test run and passed?		 - System OK Go to Step 1 
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