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DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR)

DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR)

OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the knock sensor. Judge NG when out of the standard value.

COMPONENT DESCRIPTION


(1)

Case

(4)

Nut

(A)

To knock sensor harness

(2)

Weight

(5)

Resistance

(3)

Piezoelectric element



ENABLE CONDITION

Secondary Parameters Enable Conditions
None



GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 1 second.

Judgment Value

Malfunction Criteria Threshold Value
Output voltage

< 0.238 V

Ignition switch

ON



Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as the malfunction occurs.

Normality Judgment

Judge OK and clear NG when the malfunction criteria below are completed.

Judgment Value

Malfunction Criteria Threshold Value
Output voltage

≥ 0.25 V

Ignition switch

ON



DTC CLEAR CONDITION


When the OK idling cycle was completed 40 times in a row

When “Clear Memory” was performed


MALFUNCTION INDICATOR LIGHT CLEAR CONDITION


When the OK driving cycle was completed 3 times in a row

When “Clear Memory” was performed


FAIL SAFE

Knock compensation:


At normal: Learned ignition timing value = knock F/B timing value + whole learning timing value + partial learning timing value.

At trouble: Learned ignition timing = −3°CA (Retard 3°CA)

Knock F/B timing value = 0°CA

Whole learning is not allowed.

Partial learning is not allowed.


ECM OPERATING AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)