Toyota P0325 Manual do Utilizador descarregar pdf

A09120

Knock Sensor

ECM

J/C

(Shielded)

KNK1

EB1

–DIAGNOSTICS ENGINE

DI–71

2000 CELICA (RM744U)

DTC P0325 Knock Sensor 1 Circuit Malfunction

CIRCUIT DESCRIPTION

The knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelec-

tric 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 Detecting Condition Trouble Area

P0325

No knock sensor 1 signal to ECM with engine speed, 2,000

rpm or more

S Open or short in knock sensor 1 circuit

S Knock sensor 1 (looseness)

S ECM

HINT:

If the ECM detects above diagnosis conditions, it operates the fail safe function in which the corrective retard

angle value is set to the maximum value.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using TOYOTA hand–held tester or OBD II scan tool. Because freeze frame records

the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining

whether the vehicle was running or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc.

at the time of the malfunction.

DI38A–03

1 2 3

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A09120K1Knock SensorECMJ1J/C(Shielded)KNK127E5W1EB1WAABRED1–DIAGNOSTICS ENGINEDI–712000 CELICA (RM744U)DTC P0325 Knock Sensor 1 Circuit MalfunctionC

A09086A09094LOCKKNK1DI–72–DIAGNOSTICS ENGINE2000 CELICA (RM744U)1 Check continuity between terminal KNK of ECM connector and body ground.PREPARATION

A00406KNK signal waveform0.5V/ Division0V0V5 m sec./Division100 sec./Division0.5V/ Division–DIAGNOSTICS ENGINEDI–732000 CELICA (RM744U)4 Do

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Toyota P0325 Manual do Utilizador