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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1475 (Engine Control System - Diagnosis - 4.8L, 5.3L, & 6.0L (DTC P0172 To DTC P0507)) >> Diagnostic Information & Procedures >> DTC P0327 or P0332 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. 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. 2:  This step ensures that the malfunction is present.
  2. 3:  This step tests the KS and the KS jumper harness for an open or a short to ground.
  3. 4:  Tapping on the engine block will simulate an engine knock.
DTC P0327 or P0332

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Connector End Views  or  Powertrain Control Module (PCM) 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 
IMPORTANT: If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical in Engine Mechanical.
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?		 - Go to Step 3  Go to Diagnostic Aids
3 
  1. Disconnect the knock sensor (KS) jumper harness connector located on the left side of the intake manifold.
  2. Set the DMM to the 400 K-ohm scale.
  3. Measure the resistance from the affected KS signal circuit on the sensor side of the KS jumper harness connector to a good ground with the DMM.
Is the resistance within the specified range?		 93-107K Ω Go to Step 4  Go to Step 6 
4 
  1. With the DMM still connected, set the DMM to the 400 mV AC hertz scale.
    2. IMPORTANT: Do not tap on plastic engine components.
  2. Tap on the engine block with a nonmetallic object near the affected KS while observing the signal indicated on the DMM.
Is any signal indicated on the DMM while tapping on the engine block near the KS?		 - Go to Step 5  Go to Step 7 
5
  1. Disconnect the PCM.
  2. Test the affected KS signal circuit between the PCM and the KS jumper harness connector for the following conditions:
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
6
  1. Remove the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
  2. Test the KS signal circuit between the KS jumper harness connector and the KS connector for the following conditions:
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7 Test for an intermittent and for a poor connection at the affected KS. Refer to Testing for Intermittent Conditions and Poor Connections or Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
8 Test for an intermittent and for a poor connection at the KS jumper harness connector. Refer to Testing for Intermittent Conditions and Poor Connections or Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
9 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections or Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the affected KS. Refer to Knock Sensor (KS) Replacement .
Did you complete the repair?		 - 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. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?		 - Go to Step 2  Go to Step 13 
13 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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