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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 P2430 >> 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. 2:  This step determines if DTC P2430 is the result of a hard failure or an intermittent condition. Normal pressure sensor input voltage is approximately 1.6 volts with the ignition ON, AIR pump OFF.
  3. 4:  This step checks for an open or a short in the pressure sensor 5-volt reference.
  4. 5:  This step checks for an open or short in the pressure sensor input circuit.
  5. 8:  This step checks for an open in the pressure sensor ground circuit.
DTC P2430

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-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Backprobe the input circuit of the secondary AIR pressure sensor with a DMM to ground.
Is the pressure sensor input circuit voltage within the specified value?		 1.5-1.6 V Go to Step 3  Go to Step 4 
3
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the input circuit voltage of the AIR pressure sensor while operating the AIR pump.
  3. Command the AIR solenoid and pump ON with the scan tool. Refer to Scan Tool Output Controls .
Did the pressure sensor voltage increase to at least the specified value when the AIR pump was ON?		 1.9-2.1 V Go to Diagnostic Aids Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the pressure sensor electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Use a DMM in order to measure the reference circuit voltage on the harness side of the pressure sensor connector.
Does the voltage equal the specified value?		 5.0 V Go to Step 5  Go to Step 6 
5  Measure the voltage from the pressure sensor input circuit on the harness side using a DMM.
Is the voltage near the specified value?		 4.9 V Go to Step 8  Go to Step 7 
6 Repair the open in the reference voltage circuit of the pressure sensor between the sensor and SP108. Refer to Wiring Repairs in Wiring Systems.
Is the action complete?		 - Go to Step 12  -
7
  1. Inspect the pressure sensor input circuit for an open or a short. Verify that the input circuit is not shorted to the sensor ground circuit.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Was a repair necessary?		 - Go to Step 12  Go to Step 11 
8  Probe the pressure sensor ground circuit on the harness side with a test lamp connected to B+.
Does the test lamp illuminate?		 - Go to Step 10  Go to Step 9 
9 Repair the open in the ground circuit of the pressure sensor between the sensor and the splice in the sensor ground circuit. Refer to Wiring Repairs in Wiring Systems.
Is the action complete?		 - Go to Step 12  -
10 Replace the AIR pressure sensor. Refer to Secondary AIR Injection Pressure Sensor Replacement .
Is the action complete?		 - Go to Step 12  -
11 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Is the action complete?		 - Go to Step 12  -
12
  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.
Does the DTC run and pass?		 - Go to Step 13  Go to Step 2 
13 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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