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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 638 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P0135 To DTC P0420)) >> Diagnostic Trouble Codes >> DTC P0328 or P0333 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Buick Rendezvous. 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 verifies a condition is present.
  2. 4:  This step is testing for Electromagnetic interference (EMI). If the KS circuits are routed close to high load circuits or components, this DTC may set.
  3. 5:  This step is testing for a poor connection at the component and for an intermittent condition with the wiring.
  4. 6:  This step is testing if the KS is installed correctly. A KS that is not fully seated, may cause this DTC to set.
P0328 or P0333 Knock Sensor (KS) Circuit High Voltage Bank 1 or Bank 2

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) 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 
IMPORTANT: If you can hear an engine knock, repair the engine mechanical condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical in Engine Mechanical - 3.6L (LY7).
  1. Start the engine.
  2. Allow the engine to reach operating temperature.
  3. Operate the vehicle within the Conditions for Running the DTC.
  4. Observe the DTC Info with a scan tool.
Does the DTC fail this ignition?		 - Go to Step 4  Go to Step 3 
3
  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.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Diagnostic Aids
4 
  1. Turn OFF the ignition.
  2. Inspect the knock sensor (KS) circuits for the following conditions:
    • Routed too close to the battery or the battery cables
    • Routed too close to other wiring or components
    • Routed too close to after market add on electrical equipment
    • Routed too close to solenoids, relays, and motors
  3. Repair the condition as necessary.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 5 
5 
  1. Start the engine.
  2. Move the related harnesses and connectors for the KS circuits between the engine control module (ECM) and the KS.
  3. Observe the KS signal voltage parameter with a scan tool.
Does the KS parameter change abruptly while moving the related harnesses?		 - Go to Step 11  Go to Step 6 
6 
  1. Turn OFF the engine.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Inspect the KS for being installed correctly. Make sure the KS fastener is torqued to the specified value.
Did you find and correct the condition?		 23 N.m (17 lb ft) Go to Step 15  Go to Step 7 
7
  1. Swap the suspected KS with the other KS.
  2. Operate the vehicle within the Conditions for Running the DTC.
  3. Observe the DTC Info with a scan tool.
Did the same KS DTC fail?		 - Go to Step 9  Go to Step 8 
8 Did the opposite bank KS DTC fail? - Go to Step 13  Go to Step 12 
9 Test for an intermittent and for a poor connection at the KS. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 10 
10 Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
11 Repair the appropriate KS circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 15  -
12 Repair the poor connection at the KS. Refer to Wiring Repairs and Connector Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 15  -
13 Replace the KS. Refer to the appropriate procedure:
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 15  -
15
  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.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 16 
16 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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