Es

DTC

P0327

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

DTC

P0328

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

DTC

P0332

Knock Sensor 2 Circuit Low Input (Bank 2)

DTC

P0333

Knock Sensor 2 Circuit High Input (Bank 2)

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz and 15 kHz.

Knock sensors are fitted onto the engine block to detect engine knocking.

The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No.

DTC Detection Conditions

Trouble Areas

P0327 P0332

Output voltage of knock sensor 1 or 2 is 0.5 V or less (1 trip detection logic)

• Short in knock sensor 1 or 2 circuit

• ECM

P0328 P0333

Output voltage of knock sensor 1 or 2 is 4.5 V or more (1 trip detection logic)

• Open in knock sensor 1 or 2 circuit

When any of DTCs P0327, P0328, P0332 and P0333 are set, the ECM enters fail-safe mode. During failsafe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned OFF.

KNK1 Signal Waveform 1V/ DIV

A085286E10

KNK1 Signal Waveform 1V/ DIV

i i i i

1 1 1 1

1 1 1 1 -

1 msec./ Division

1 msec./ Division

Reference: Inspection using an oscilloscope The correct waveform is as shown.

Items

Contents

KNK2 - EKN2

Equipment Settings

0.01 to 10 V/Division, 0.01 to 10 msec./Division

Conditions

Keep engine speed at 4,000 rpm with warm engine

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