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Subaru Legacy Service Manual: Dtc p0327 knock/combustion vibration sensor 1 circuit low bank 1 or single sensor

Subaru Legacy Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0327 knock/combustion vibration sensor 1 circuit low bank 1 or single sensor

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Poor driving performance

Knocking occurs

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

WIRING DIAGRAM:

Engine Electrical System ENGINE TYPE FB (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

Engine Electrical System ENGINE TYPE FB (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN ECM AND KNOCK SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Measure the resistance between ECM connectors.

Connector & terminal

(E158) No. 30 — (E158) No. 34:

Is the resistance less than 500 k--

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0327 KNOCK/COMBUSTION VIBRATION SENSOR 1 CIRCUIT LOW BANK 1 OR SINGLE SENSOR

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0327 KNOCK/COMBUSTION VIBRATION SENSOR 1 CIRCUIT LOW BANK 1 OR SINGLE SENSOR

2.CHECK KNOCK SENSOR.

1) Disconnect the connector from the knock sensor.

2) Measure the resistance between knock sensor terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 500 k--

Replace the knock sensor. Knock Sensor

Repair the short circuit to ground in harness between ECM connector and knock sensor connector.

NOTE:

The harness between both connectors are shielded. Remove the shield and repair the short circuit of harness.

3.CHECK INPUT SIGNAL OF ECM.

1) Connect the connector to ECM.

2) Turn the ignition switch to ON.

3) Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(E158) No. 30 (+) — Chassis ground (−):

Is the voltage 2 V or more-

Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

Repair the short circuit to ground in harness between ECM connector and knock sensor connector.

NOTE:

The harness between both connectors are shielded. Remove the shield and repair the short circuit of harness.

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

(A)

To knock sensor harness

(1)

Case

(3)

Piezoelectric element

(5)

Resistance

(2)

Weight

(4)

Nut

3. EXECUTION CONDITION

Secondary Parameters

Execution condition

None

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage

< 0.278 V

Time Needed for Diagnosis: 1000 ms

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

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Other materials:

Removal
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