P0327

CIRCUIT DESCRIPTION

Schematic:

The PCM uses a Knock Sensor (KS) to detect engine detonation (spark knock). The knock sensor produces an AC signal at all engine speeds, and loads. The PCM makes adjustments to the spark timing based on the amplitude and frequency of the KS signal.

A knock sensor module is no longer used to diagnose the knock sensor system. The circuitry is integrated into the PCM. The PCM uses the knock sensor to determine the amount of normal engine noise (noise channel) for a wide range of engine speeds and loads. The PCM compares the actual knock sensor signal to the learned noise channel. The PCM uses the noise channel to diagnose the knock sensor and related wiring. If the PCM detects a loss of the noise channel, DTC P0327 will set.

CONDITIONS FOR RUNNING THE DTC
^ Engine speed is more than 3000 RPM.
^ ECT is more than 40°C (104°F)
^ System voltage is between 11 and 18 volts.
^ Throttle angle is more than 5 percent

CONDITIONS FOR SETTING THE DTC
The PCM detects a KS signal less than 0.5 volt.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the malfunction indicator lamp (MIL).
^ The PCM will store the conditions present when the DTC set as Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS

NOTE: Refer to Connector Test Adapter Kit J 35616-A Notice in Service Precautions.

If the conditions is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions

TEST DESCRIPTION

Steps 1 - 6:

Steps 7 - 11: