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Home >> Chevrolet >> 2006 >> Avalanche 2500 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 8.1L - DTC P0506 To DTC U0107 >> DTC P2101 >> Test Description
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Test Description

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

  1. 4:  If the TP indicated angle does not follow the movement of the throttle blade, and no TP sensor DTCs are set, there is a mechanical condition with the throttle shaft or the TP sensor.
  2. 15:  Locating and repairing an individual condition may correct more than one DTC.
DTC P2101

Step Action Yes No
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Is DTC U0107 also set? Go to DTC U0107  Go to Step 3 
3
IMPORTANT: The next test must be started within 15 seconds after the ignition is turned ON.
  1. Turn OFF the ignition for 15 seconds.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the Throttle Position (TP) Sensor 1 and TP Sensor 2 Angle parameters with a scan tool.
  4. Slowly depress the accelerator pedal to wide open throttle (WOT) and slowly return the pedal to the released position.
Does the scan tool indicate both Angle parameters increasing as the pedal is depressed to WOT and decreasing as the pedal is moved to the released position?		 Go to Diagnostic Aids Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Remove the air inlet duct from the throttle body.
  3. Disconnect the throttle body harness connector.
  4. Connect the jumper wires between the TP sensor terminals of the throttle body harness connector and the corresponding TP sensor terminals of the throttle body.
  5. Turn ON the ignition with the engine OFF.
  6. Open the throttle blade to WOT and then to the closed position by hand.
  7. Observe the TP Sensor 1 and TP Sensor 2 Angle parameters with a scan tool.
Does the scan tool indicate both Angle parameters increasing as the throttle plate is moved to WOT, and decreasing as the throttle plate is moved to the closed position?		 Go to Step 5  Go to Step 12 
5
  1. Turn OFF the ignition.
  2. Disconnect the throttle actuator control (TAC) module harness connector containing the TAC motor circuits.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the TAC motor circuits for a short to voltage with a DMM. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 6 
6 Test each TAC motor circuit for an open or high resistance with a DMM. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 7 
7 Test each TAC motor circuit for a short to ground with a DMM. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 8 
8
  1. Disconnect the other TAC module harness connector.
  2. Remove all jumper wires.
  3. Test for a short between each TAC motor circuit and all other TAC module circuits with a DMM. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 14  Go to Step 9 
9
  1. Turn OFF the ignition.
  2. Connect the TAC module.
  3. Connect a test lamp between the two TAC motor circuits at the TAC motor harness connector.
  4. Turn ON the ignition, with the engine OFF, and observe the test lamp.
Did the test lamp illuminate briefly when the ignition was turned ON?		 Go to Step 10  Go to Step 12 
10 Inspect for poor connections at the TAC motor harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals .
Did you find and correct the condition?		 Go to Step 14  Go to Step 11 
11 Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement .
Did you complete the replacement?		 Go to Step 14  -
12 Inspect for poor connections at the TAC module harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals .
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
13 Replace the TAC module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 14  -
14
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 2  Go to Step 15 
15  Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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