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Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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. 5:  If the throttle position (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 with the TP sensor.
  2. 16:  When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests that run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the stored information, Capture info.
DTC P2101

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View References:  Powertrain Control Module (PCM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Are DTCs P2135 and U0107 both set? Go to DTC U0107 Go to Step 3 
3 Is DTC P2135 set? Go to DTC P2135 Go to Step 4 
4
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 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 5 
5 
  1. Turn OFF the ignition.
  2. Remove the air duct from the throttle body assembly.
  3. Disconnect the throttle actuator control motor harness connector.
  4. Turn ON the ignition, with the engine OFF.
  5. With your hand, slowly open the throttle blade to WOT and then to the closed throttle position while observing the TP sensor 1 and TP sensor 2 angle parameters on the 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 6  Go to Step 13 
6
  1. Turn OFF the ignition.
  2. Disconnect the throttle actuator control (TAC) module harness connector containing the throttle actuator control motor circuits.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the throttle actuator control motor circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 15  Go to Step 7 
7 Test each throttle actuator control motor circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 15  Go to Step 8 
8 Test each throttle actuator control motor circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 15  Go to Step 9 
9
  1. Disconnect the other TAC module harness connector.
  2. Test for a short between each throttle actuator control motor circuit and all other TAC module circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 15  Go to Step 10 
10
  1. Turn OFF the ignition.
  2. Connect the TAC module.
  3. Connect a test lamp between the two throttle actuator control motor terminals at the throttle actuator control 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 11  Go to Step 13 
11 Inspect for poor connections at the throttle actuator control motor harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.
Did you find and correct the condition?		 Go to Step 15  Go to Step 12 
12 Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement .
Did you complete the replacement?		 Go to Step 15  -
13 Inspect for poor connections at the TAC module harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.
Did you find and correct the condition?		 Go to Step 15  Go to Step 14 
14 Replace the TAC module. Refer to Throttle Actuator Control (TAC) Module Replacement .
Did you complete the replacement?		 Go to Step 15  -
15
  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 16 
16  Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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