DTC P0324, P0326, or P06B6 - LLU
Diagnostic Instructions
DTC Descriptors
DTC P0324 00: Knock Sensor Module
Performance
DTC P0326 00: Knock Sensor Performance
DTC P06B6 00: Control Module Knock Sensor
Processor 1 Performance
Circuit/System Description
The knock sensor enables 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 sensor produces 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 knock sensor
signal. The ECM receives the knock sensor signal through a signal
circuit. The ECM supplies an ground circuit to the knock sensor
through a low reference circuit. The ECM also supplies a shielded
ground circuit to the knock sensor. The ECM learns a knock sensor
noise level at idle and uses calibrated values for the rest of the
engine speed range. The ECM should monitor a normal knock sensor
signal within the noise channel.
Conditions for Running the DTC
• |
The engine speed is greater than
700 RPM. |
• |
The engine speed is between
700-2 500 RPM for DTC P06B6 00. |
• |
The airflow into the engine is between
40-2,000 mg/cylinder. |
• |
This DTC runs continuously within the enabling
conditions. |
• |
DTCs P0324 00, P0326 00 and
P06B6 00 run continuously once the above conditions are
met. |
Conditions for Setting the DTC
P0324 00 or P0326 00
The control module detects an overactive knock sensor.
P06B6 00
The control module detects an internal circuitry fault.
Action Taken When the DTC Sets
DTCs P0324 00, P0326 00 and P06B6 00 are
Type C DTCs.
Conditions for Clearing the DTC
DTCs P0324 00, P0326 00, and P06B6 00 are
Type C DTCs.
Diagnostic Aids
• |
Inspect the knock sensor for physical damage and
proper installation. A knock sensor that is dropped or damaged may
cause a DTC to set. |
• |
Inspect the knock sensor for proper installation.
A knock sensor that is loose or over torqued may cause a DTC to
set. The knock sensor should be free of thread sealant. |
• |
The knock sensor mounting surface should be free
of burrs, casting flash, and foreign material. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Knock Sensor System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Engine idling, observe the DTC information with a scan
tool. Verify DTC P06B6 00 is not set.
⇒ |
If the DTC is set, replace the K20 Engine
Control Module. |
- Ignition OFF, inspect for the following:
• |
Inspect the B68 Knock Sensor for physical
damage. A B68 Knock Sensor that is dropped or damaged may
cause a DTC to set. |
• |
Inspect the B68 Knock Sensor for proper
installation. A B68 Knock Sensor that is loose or over torqued
may cause a DTC to set. The B68 Knock Sensor should be free of
thread sealant. The B68 Knock Sensor mounting surface should
be free of burrs, casting flash, and foreign material. |
• |
The B68 Knock Sensor must be clear of hoses,
brackets, and engine electrical wiring. |
• |
Inspect for loose accessory brackets. |
• |
Inspect for serpentine belt and tensioner
wear. |
⇒ |
If a condition is found, repair as necessary. |
- If there is no mechanical condition, test or replace
the B68 Knock Sensor.
- Operate the vehicle within the conditions for running
the DTC to verify the DTC does not reset. You may also operate the
vehicle within the conditions that you observed from the freeze
frame/failure records data.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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