DTC P0326 - Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor) High Voltage ( click HERE
Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. A 5 volt reference is supplied to the sensor and there is a signal return from the knock sensor to the PCM (powertrain control module). The sensor signal wire informs the PCM when a knock occurs and in what degree of severity. The PCM will ****** the spark timing to avoid pre-detonation. Most PCMs have the ability to learn spark knock trends in the engine during normal operation.
If the PCM determines that the knock is out of the ordinary or that the noise level is abnormally high, P0326 may set. If the PCM senses that the knock is severe and cannot be eliminated by retarding the spark timing, P0326 may set. Keep in mind that knock sensors cannot distinguish between a knock from pre-detonation or one from engine problems.
If an engine knock can be heard, fix the source of the mechanical
problem first then retest. Make sure the proper octane of fuel was used
in the engine. Using lower octane fuel than what is specified can cause a
ping or pre-detonation and may cause P0326.
Unplug the knock sensor and check for water or corrosion in the
connector. If the knock sensor has a seal, verify there is no coolant
from the engine block fouling the sensor. Repair as necessary.
Turn ignition to run position with engine off. Ensure that 5 Volts
are present at the KS connector. If there is, check for proper
resistance between KS terminal and engine ground. You will need a
vehicle specification for this. If resistance is out of specification,
replace the knock sensor. If resistance is normal, plug KS back in and
idle the engine. Using a scan tool in datastream, observe KS value. Does
it indicate a knock is present at idle? If so, replace the knock
sensor. If the knock sensor shows no knock at idle, then tap on the
engine block while observing the knock signal. If it doesn't show a
signal that corresponds with the taps, replace the knock sensor. If it
does, verify the knock sensor wiring isn't routed next to ignition
wires. If there was no 5 volts present at the knock sensor connector
while unplugged with KOEO (Key on engine off) then go back to the PCM
connector. Turn ignition off and clip the knock sensor 5 volt reference
wire in a location that is easy to repair (Or remove the wire from the
PCM connector). With KOEO, check for 5 volts on the PCM side of the
clipped wire. If 5 volts isn't present, suspect a bad PCM. If 5 volts IS
present, repair short in 5 volt reference circuit.
Since the reference circuit is a shared circuit, you will need to
check all engine sensors that are fed a 5 volt reference. Unplug each
sensor one at a time until the reference voltage returns. When it
returns the last sensor you plugged in is the shorted sensor. If no
sensors are shorted, check the wiring harness for short to voltage on
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