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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1387 (Engine Control System Diagnosis (DTC P0130 To DTC P0456) -- 1.8L (LV6)) >> Diagnosis >> DTC P0327 >> 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 verifies the resistance of the KS.
DTC P0327

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 OFF the ignition.
  2. Disconnect the knock sensor (KS) electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage across the KS connector, harness side, with a DMM.
Is the voltage within the specified value?		 4.9-5.1 V Go to Step 3  Go to Step 4 
3 
  1. Turn OFF the ignition.
  2. Connect the KS electrical connector.
  3. Disconnect the PCM electrical connector C2.
  4. Measure the resistance between the KS Signal High circuit and the KS Signal Low circuit with the DMM.
Is the resistance near the specified value?		 200K ohm at 20°C (68°F) Go to Diagnostic Aids Go to Step 5 
4
  1. Inspect for a short to ground in the KS Signal High circuit.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 7  Go to Step 6 
5 Replace the knock sensor. Refer to Knock Sensor (KS) Replacement .
Did you complete the replacement?		 - Go to Step 7  -
6 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 7  -
7
  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.
Does the DTC run and pass?		 - Go to Step 8  Go to Step 2 
8 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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