DTC P0324, P0326, or P06B6 (LUJ)
Diagnostic Instructions
DTC Descriptor
| 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 a 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
| 1. |
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. |
| 2. |
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. |
| 3. |
If there is no mechanical
condition, test or replace the B68 Knock Sensor. |
| 4. |
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.
|
