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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 863 (Engine Controls Diagnostic (DTC P0172 To DTC P0455) -- 5.7L) >> Diagnosis >> DTC P0327 or P0332 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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 verifies the malfunction is present.
  2. 3:  This test will isolate the knock sensor from the rest of the circuit.
  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:  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 
IMPORTANT: If an engine knock can be heard, repair the engine mechanical condition before proceeding with this diagnostic.
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the engine within the Conditions for Running the DTC as close to the Freeze Frame/Failure Records data that you observed.
Does the scan tool indicate that this diagnostic failed this ignition?		 - Go to Step 3  Go to Diagnostic Aids
3 
  1. Remove the left engine sight shield.
  2. Disconnect the knock sensor (KS) jumper harness connector located on the left side of the intake manifold.
  3. Set the DMM to the 400K ohm scale.
  4. Measure the resistance of the affected KS using the DMM connected to battery ground.
Is the resistance of the knock sensor within the specified range?		 93-107K Ω Go to Step 4  Go to Step 6 
4 
  1. Connect the DMM between the affected KS signal circuit on the sensor side and a good ground.
  2. Set the DMM to the 400 mV AC hertz scale. Refer to Measuring Frequency in Wiring Systems.
    3. IMPORTANT: Do not tap on plastic engine components.
  3. Tap on the engine block 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 connector. Refer to Powertrain Control Module (PCM) Replacement .
  2. Test the KS signal circuit between the PCM and the KS jumper harness connector for the following:
    • An open or high resistance
    • A short to voltage
    • A short to ground
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
6
  1. Remove the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
  2. Test for an open, high resistance or a short to ground in the signal circuit between the knock sensor jumper harness connector, located at the left side of the intake manifold and the KS connector. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7
  1. Inspect the KS signal circuit for a poor connection at the affected KS. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  2. If you find a poor connection repair the connector as necessary. Refer to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
8 Replace the KS. Refer to Knock Sensor (KS) Replacement .
Did you complete the replacement?		 - Go to Step 12  -
9
  1. Inspect the KS signal circuit for a poor connection at the KS jumper harness connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  2. If you find a poor connection, repair the connector as necessary. Refer to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
10
  1. Inspect the KS signal circuit for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  2. If you find a poor connection, repair the connector as necessary. Refer to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
11 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - 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 as specified in the supporting text.
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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