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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 P2444 (L26, Nu3) >> Test Description

Test Description

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.

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

  1. 3:  This step tests for the correct operation of the AIR pump. When the AIR pump relay is commanded ON with the scan tool, only the AIR pump relay is energized. When the AIR valve relay is commanded ON with the scan tool, both the AIR pump and the AIR valve relays are energized.
  2. 4:  This step tests for the correct operation of the AIR pump relay.
DTC P2444 (L26, NU3)

Step Action 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 Is the secondary air injection (AIR) pump operating continuously when the ignition is OFF or ON and the engine is OFF? Go to Step 4  Go to Step 3 
3 
  1. Turn ON the ignition, with the engine OFF.
  2. Command the AIR valve relay ON and OFF with the scan tool.
Did the AIR pump turn ON and OFF when commanded ON and OFF?		 Go to Diagnostic Aids Go to Step 4 
4  Remove the AIR pump relay.
Is the AIR pump still operating?		 Go to Step 5  Go to Step 6 
5 Repair the short to voltage in the AIR pump supply voltage circuit. Refer to Wiring Repairs .
Did you complete the repair?		 Go to Step 10  -
6
  1. Turn OFF the ignition.
  2. Probe the control circuit, of the AIR pump relay socket, with a test lamp connected to B+.
  3. Turn ON the ignition, with the engine OFF.
  4. Command the AIR valve relay ON and OFF with the scan tool.
Did the test lamp stay illuminated even when the relay was commanded OFF?		 Go to Step 7  Go to Step 8 
7
  1. Inspect for a short to ground in the control circuit of the AIR pump relay between the relay and the powertrain control module (PCM).
  2. Repair the wiring, as necessary. Refer to Wiring Repairs .
Did you find and repair a wiring short?		 Go to Step 10  Go to Step 9 
8 Replace the AIR pump relay.
Did you complete the repair?		 Go to Step 10  -
9 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 Go to Step 10  -
10
  1. Ensure all components and connectors are installed and secured.
  2. Replace fuses, relays, as necessary.
  3. Turn the ignition ON, with the engine OFF.
  4. Command the AIR valve relay ON and OFF with a scan tool.
Did the AIR pump turn ON and OFF when commanded ON and OFF?		 Go to Step 11  Go to Step 2 
11
  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.
Did a DTC P2444 set?		 Go to Step 2  Go to Step 12 
12 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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