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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1862 (Engine Controls And Fuel - 3.5L (L66) - DTC P0223 To DTC P0499) >> DTC P0325 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 1:  The Diagnostic System Check - Vehicle 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 checks whether DTC P0325 is the result of a hard failure or an intermittent condition.
  3. 4:  This step tests the KS signal circuit and the PCM. Shorting the signal circuit to 5 volts enables validation of the signal wire and the PCM recognition of a voltage input. The EGR valve is the most convenient 5-volt supply for performing this test.
  4. 7:  After replacing the PCM a new minimum throttle position and idle speed must also be established.
DTC P0325

Step Action Values Yes No
Connector End View Reference:  Powertrain Control Module 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. Install a scan tool.
  2. Start the engine.
  3. Observe the Knock Control parameter on the scan tool while performing several acceleration events.
Did the Knock Control parameter switch from Inactive to Active at least once during AA acceleration event?		 - Go to Step 3  Go to Step 4 
3
  1. Perform the scan tool Clear DTC Information function.
  2. Operate the vehicle within the Freeze Frame conditions as specified.
Does DTC P0325 set?		 - Go to Step 4  Go to Diagnostic Aids In This Test
4 
  1. Turn OFF the ignition.
  2. Disconnect the knock sensor connector.
  3. Connect a fused jumper wire to the knock sensor (KS) signal circuit and the 5-volt reference circuit of the exhaust gas recirculation (EGR) position sensor.
  4. Turn ON the ignition with the engine OFF.
Is the DC voltage within the specified range?		 3.8-4.0 V Go to Step 5  Go to Step 6 
5 Replace the KS. Refer to Knock Sensor Replacement .
Is the action complete?		 - Go to Step 8  -
6
  1. Check for an open or a short in the KS signal circuit.

    Ensure that the terminal connection at the sensor is good.

  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and repair a wiring condition?		 - Go to Step 8  Go to Step 7 
7 
  1. Replace the powertrain control module (PCM). Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
Did you complete the replacement?		 - Go to Step 8  -
8
  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 as specified in the supporting text or until the DTC P0325 diagnostic test has run.
Does the DTC run and pass?		 - Go to Step 9  Go to Step 2 
9 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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