Conditions for Clearing the MIL/DTC

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 control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

DTC P2564

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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	Turn ON the ignition, with the engine OFF. Monitor the Diagnostic Trouble Code (DTC) Information with a scan tool. Is DTC P0652 also set?	-	Go to DTC P0652	Go to Step 3
3	Start the engine. Select the TC Vane Position Sensor test in Scan Tool Output Controls. With the engine at idle, observe the TC vane position and the desired TC vane position while commanding the TC vane position sensor to 100 percent with the scan tool. Is the TC vane position at or near the desired TC vane position while commanding the TC vane position sensor from 0-100 percent?	-	Go to Step 4	Go to Step 5
4	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 5	Go to Intermittent Conditions
5	Turn OFF the ignition. Disconnect the turbocharger vane position sensor. Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit to a good ground with a DMM. Is the voltage less than the specified value?	4.8 V	Go to Step 7	Go to Step 6
6	Measure the voltage from the signal circuit to a good ground with a DMM. Is the voltage less than the specified value?	4.8 V	Go to Step 8	Go to Step 9
7	Turn OFF the ignition. Disconnect the engine control module (ECM). Test the vane position sensor 5-volt reference circuit for an open and for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 10
8	Turn OFF the ignition. Disconnect the ECM. Test the vane position sensor signal 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 13	Go to Step 10
9	Test for an intermittent and for a poor connection at the vane position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 11
10	Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
11	Replace the turbocharger vane position sensor. Refer to Turbocharger Vane Position Sensor Replacement . Did you complete the replacement?	-	Go to Step 13	-
12	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 13	-
13	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Perform the turbocharger learn procedure. Refer to Turbocharger Learn Procedure . 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 14
14	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