Buick Regal: DTC P0324, P0326, P0331, P06B6, or P06B7
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
DTC P0324
Knock Sensor System Performance
DTC P0326
Knock Sensor 1 Performance
DTC P0331
Knock Sensor 2 Performance
DTC P06B6
Control Module Knock Sensor Processor 1 Performance
DTC P06B7
Control Module Knock Sensor Processor 2 Performance
Diagnostic Fault Information
Circuit/System Description
The knock sensors enable the engine control module (ECM) to control the
ignition timing for the best
possible performance while protecting the engine from potentially damaging
levels of detonation. The
knock sensors produce an alternating current (AC) voltage signal that varies
depending on the vibration
level during engine operation. The ECM adjusts the spark timing based on the
amplitude and the
frequency of the two knock sensor signals. The ECM receives each knock sensor
signal through a
dedicated circuit. The ECM learns a minimum knock sensor noise level for all of
the engine speed
ranges and monitors the normal knock sensor signal. The ECM monitors the
internal knock sensor
processor test circuits which perform the open circuit diagnostic.
Conditions for Running the DTCs
P0324
- Engine is running for 2 s or greater.
- Engine speed is 8, 500 RPM or less.
- Engine air flow is between 0 - 2000 mg per cylinder.
- The engine coolant temperature (ECT) is -40ºC (-40ºF) or warmer.
- The intake air temperature (IAT) sensor is -40ºC (-40ºF) or warmer.
AND
- Engine speed is 550 RPM or greater for 300 or more cumulative
revolutions.
OR
- Engine speed is 8500 RPM or greater for 400 or more cumulative
revolutions.
P0326 and P0331
- Engine is running for 2 s or greater.
- Engine speed is 8, 500 RPM or less.
- Engine air flow is between 20 - 2000 mg per cylinder.
- The engine coolant temperature (ECT) is -40ºC (-40ºF) or warmer.
- The intake air temperature (IAT) sensor is -40ºC (-40ºF) or warmer.
AND
- Engine speed is 500 RPM or greater for 200 or more cumulative
revolutions.
OR
- Engine speed is 2000 RPM or greater for 200 or more cumulative
revolutions.
OR
- Engine speed is 8500 RPM or greater for 200 or more cumulative
revolutions.
P06B6 and P06B7
- Engine is running for 2 s or greater.
- Engine speed is between 400 - 8, 500 RPM for 150 or more cumulative
revolutions.
- Engine air flow is between 20 - 2000 mg per cylinder.
The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTCs
P0324
The ECM detects that either knock sensor signal performance is out of the
normal calibrated range due
to excessive engine knock on a per cylinder basis.
P0326
The ECM detects that the knock sensor 1 signal performance is out of the
normal calibrated range due to
a low signal level.
P0331
The ECM detects that the knock sensor 2 signal performance is out of the
normal calibrated range due to
a low signal level.
P06B6 and P06B7
The ECM has detected a fault in the knock sensor processor open circuit
diagnostic internal test circuit.
Action Taken When the DTCs Set
- DTCs P0324, P0326, P0331, P06B6, and P06B7 are Type B DTCs.
- The ignition timing is retarded to reduce the potential of engine
damaging spark knock.
Conditions for Clearing the DTCs
DTCs P0324, P0326, P0331, P06B6, and P06B7 are Type B DTCs.
Reference Information
Description and Operation
Electronic Ignition System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Engine Running.
2. Verify DTC P0325, P0327, P0328, P0330, P0332, P0333, P06B6, or P06B7 is not
set.
- If DTC P0325, P0327, P0328, P0330, P0332, or P0333 is set with P06B6
or P06B7
Refer to DTC P0325, P0327, P0328, P0330, P0332, or P0333.
- If only DTC P06B6 or P06B7 is set
Replace the K20 Engine Control Module.
- Go to next step: If none of the DTCs are set
3. Ignition OFF.
4. Verify none of the conditions listed below exist:
- B68 Knock Sensor or wiring harness damage.
- Incorrect B68 Knock Sensor installation. Refer to Fastener
Specifications.
- B68 Knock Sensor and engine mounting surface burrs, casting flash, and
foreign material.
- Close proximity of hoses, brackets, and engine wiring.
- Loose brackets.
- Loose or broken accessory drive belts, brackets, components.
- An engine mechanical condition. Refer to Symptoms - Engine Mechanical.
- Contaminated or poor quality fuel.
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no conditions exist
5. 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
data.
Test or replace the appropriate B68 Knock Sensor.
- Go to next step: If the DTC does not set
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Knock Sensor Replacement (Position 2) or Knock Sensor Replacement
(Position 1)
- Control Module References for engine control module replacement,
programming, and setup.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Diagnostic
System Check - Vehicle
Review the description of Strategy Based Diagnosis: Strate
SEE MORE:
Turbocharger Heat Shield Bolt [3x]
CAUTION: Refer to Fastener Caution.
NOTE: In the event that a bolt breaks upon removal of components, perform
an extraction of the broken bolt.
Tighten 14 N.m (10 lb ft)
Turbocharger Heat Shield
TURBOCHARGER REPLACEMENT
Removal Procedure
CAUTION: If a tur
Warning:
Sitting in a reclined position when
the vehicle is in motion can be
dangerous. Even when buckled
up, the seat belts cannot do
their job.
The shoulder belt will not be
against your body. Instead, it will
be in front of you. In a crash, you
could go into it, receiving neck or
other injuries.