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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1381 (Engine Control System Diagnosis (DTC P0505 To DTC P2445) -- 1.8L (LNK)) >> Diagnosis >> DTC P2444 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. 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. 1:  The Diagnostic System Check-Engine Controls prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 3:  This step checks for the correct operation of the AIR pump.
  3. 4:  This step checks for the correct operation of the AIR pump relay.
DTC P2444

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-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Is the AIR pump operating continuously when the ignition is 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 solenoid and AIR pump ON with the scan tool. Refer to Scan Tool Output Controls .
Did the AIR pump operate for approximately 5 seconds and then turn 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 circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 10  -
6
  1. Turn OFF the ignition.
  2. Probe the control circuit, cavity 3 of the relay socket, with a test lamp connected to B+.
  3. Command the AIR pump 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 PCM.
  2. Repair the wiring as necessary. Refer to Wiring Repairs in Wiring Systems.
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 Powertrain Control Module (PCM) Replacement .
Did you complete the repair?		 Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start 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 11 
11 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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