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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Control System - 3.8L (DTC P1125 To DTC P2A01)) >> Diagnosis >> DTC P2433 (L26, Nu3) >> Conditions for Clearing the MIL/DTC

Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
DTC P2433 (L26, NU3)

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Start and idle the engine.
  2. Observe the AIR pressure sensor parameter with the scan tool.
Is the voltage more than the specified value?		 4.3 V Go to Step 4  Go to Step 3 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start and idle 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 4  Go to Intermittent Conditions
4 Monitor the DTC Information with the scan tool.
Is DTC P0641 also set?		 - Go to Step 8  Go to Step 5 
5 Test for an intermittent and for a poor connection at the secondary air injection (AIR) control solenoid valve/pressure sensor assembly electrical connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 6 
6
  1. Turn OFF the ignition.
  2. Disconnect the AIR control solenoid valve/pressure sensor assembly electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the AIR pressure sensor parameter with the scan tool.
Is the voltage less than the specified value?		 0.1 V Go to Step 7  Go to Step 9 
7
  1. Turn OFF the ignition.
  2. Connect a jumper wire between each of the terminals in the AIR control solenoid valve/pressure sensor assembly harness connector and the corresponding terminal at the AIR control solenoid valve/pressure sensor assembly. Refer to Using Connector Test Adapters .
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the low reference circuit of the AIR control solenoid valve/pressure sensor assembly at the jumper wire terminal to a good ground with the DMM. Refer to Measuring Voltage Drop in Wiring Systems.
Is the voltage more than the specified value?		 0.2 V Go to Step 10  Go to Step 12 
8
  1. Turn OFF the ignition.
  2. Disconnect the AIR control solenoid valve/pressure sensor assembly electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the AIR pressure sensor parameter with the scan tool.
Is the voltage less than the specified value?		 0.1 V Go to DTC P0641 Go to Step 9 
9 Test the AIR pressure sensor signal circuit between the powertrain control module (PCM) and the AIR control solenoid valve/pressure sensor assembly for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 13 
10 Test the low reference circuit between the PCM and the AIR control solenoid valve/pressure sensor assembly for an open or for high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
11 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 13 
12 Replace the AIR control solenoid valve/pressure sensor assembly. Refer to Secondary Air Injection (AIR) Shut-Off Valve Replacement .
Did you complete the replacement?		 - Go to Step 14  -
13 Replace the PCM. 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 and idle 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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