I am getting my check engine light to come on over and over again, and it seems that the code has to do with the Knock sensor (1)....anyone know if this can be fixed by me, or do I need to take it into the dealer. I can reset it, but under hard throttle it comes back on.

 

If I remember correctly this is the part that doesn't do real well when people waash their engine. Definitely not something to leave unrepaired.

CIRCUIT DESCRIPTION
The Knock Sensor (KS) system detects engine detonation. The PCM retards the spark timing based on the signals from the knock sensors. The knock sensors produce an AC voltage. The knock sensor voltages are an input to the PCM. The amount of AC voltage produced is proportional to the amount of knock.

An operating engine produces a normal amount of engine mechanical vibration (noise). The knock sensors produce an AC voltage signal from this noise. When an engine operates, the PCM learns the minimum and maximum frequency of the noise the engine produces. When the PCM determines that this frequency is less than or greater than the expected amount, a knock sensor DTC sets.

CONDITIONS FOR RUNNING THE DTC


The engine speed is between 1650 RPM and 3000 RPM .
The MAP is less than 49 kPa (7.1 psi) .
The engine coolant temperature is greater than 60°C (140°F) .
The throttle angle is greater than the idle throttle angle.
The engine has been operating for longer than 20 second .
CONDITIONS FOR SETTING THE DTC
The PCM determines that this frequency is less than or greater than the expected amount for less than 3.0 seconds .

ACTION TAKEN WHEN THE DTC SETS


The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC


The PCM turns the malfunction indicator lamp (MIL) OFF after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A last test failed (current DTC) clears when the diagnostic runs and does not fail.
A History DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
Use a scan tool in order to clear the MIL/DTC.
DIAGNOSTIC AIDS

IMPORTANT:


Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Diagrams.
Inspect the knock sensor for proper installation. A knock sensor that is loose or over torqued may cause DTC P0327 to set.
The knock sensor jumper harness is located at the left rear of the intake manifold near the crankcase vent.
For an intermittent, refer to Symptoms. See: Diagnostic Information and Procedures\Symptoms
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.


This verifies the malfunction is present. The scan tool will display DTC Ran=Yes and Pass=Int if the failure is intermittent. This indicates the diagnostic passed this ignition cycle and failed this ignition cycle. At this point the resistance of the knock sensors should be verified to be in the correct range. If the knock sensor resistances are correct, inspect the KS system wiring connections. When inspecting the KS system connections, start at the KS system jumper harness connector located behind the intake manifold. Then inspect the connections at the PCM. Refer to the wiring schematic for the correct connector and terminal. Then inspect the connections at the appropriate knock sensor. Failure Records data does not include the parameter KS Activity, however other parameters may aid in locating the conditions under which an intermittent occurred.
This test isolates the Knock Sensor from the rest of the circuit.
Tap on the engine block in the location of the appropriate knock sensor.

 

Thanks for the education, I am at $700 at the local dealer here in town, the can only get the Knock sensor to glitch in between 1500 to 3000 rpm, so I told them to replace it, and since they were already in there and had to take the intake off to change my oil pressure sending unit, and the other knock sensor too......I hope I get no more codes after this!!!!

 

Well after removal of my intake manifold, the found that my drain tray had came a loose and oil was running down directly onto the wire harness on the inside of where the knock sensor attaches, so the are replacing the wire harness, and both knock sensors too and fixing the windage tray......quick way to spend a grand!!!!!! In mostly labor!