Circuit Inspection

How to read and use each page is shown below.

►Diagnostic Trouble Code No. and Detection Item

►Circuit Description The major role and operation, etc. of the circuit and its component parts are explained.

P0325

Knock Sensor 1 Circuit Malfunction

CIRCUIT DESCRIPTION

Knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.

CIRCUIT DESCRIPTION

Knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.

DTC No.

DTC Detection Condition

Trou

ble Area

P0325

No knock sensor 1 signal to ECM with ehgine speed 1,200 rpm or more. n.

m Open or short in kno m Knock sensor 1 (loo m ECM

Ck sensorl circuit ieness)

If the ECM detects the above diagnosis conditions, it operates the failsafe function in which the corrective retard angle value is set to the maximum value.

If the ECM detects the above diagnosis conditions, it operates the failsafe function in which the corrective retard angle value is set to the maximum value.

►Indicates the diagnostic trouble code, diagnostic trouble code set parameter and suspect area of the problem.

WIRING DIAGRAM

Knock Sensor 1

►Wiring Diagram

This shows a wiring diagram of the circuit. Use this diagram together with ELECTRICAL WIRING DIAGRAM to thoroughly understand the circuit.

Wire colors are indicated by an alphabetical code.

The first letter indicates the basic wire color and the second letter indicates the color of the stripe.

V08423

►Indicates the position of the ignition switch during the check.

LOCK

(^T) Ignition Switch LOCK (OFF)

START

Ignition Switch START

Ignition Switch ON Ignition Switch ACC

inspection Procedure Use the inspection procedure to determine if the circuit is normal or abnormal, and, if it is abnormal, use it to determine whether the problem is located in the sensors, actuators, wire harness or ECU.

1 Check continuity between terminal KNK of ECM connector and body ground.

PREPARATION:

(a) Remove the glove compartment (See page SF-68).

(b) Disconnect the E6 connector from the ECM.

CHECK:

Measure the resistance between terminal KNK of the ECM connec-

1 Check continuity between terminal KNK of ECM connector and body ground.

PREPARATION:

(a) Remove the glove compartment (See page SF-68).

(b) Disconnect the E6 connector from the ECM.

CHECK:

Measure the resistance between terminal KNK of the ECM connec-

Conector Ecu Toyota Tercel

Hndicates the place to check the voltage or resistance. indicates the connector position to checked, from the front or back side. nrnrv

Wire Harness

Wire Harness

Check from the connector back side. (with harness)

Check from the connector front side. (without harness) In this case, care must be taken not to bend the terminals

Indicates the condition of the connector of ECU during the check. KNK

Indicates the condition of the connector of ECU during the check. KNK

E6 Connector

Connector being checked is connected.

r\ ffiffl T

E6 Connector Connector being checked is disconnected

V08425

FI0048

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