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 ...
CIRCUIT DESCRIPTION The 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.
P0325
DTC Detecting Condition
Trouble Area Open or short in knock sensor 1 circuit Knock sensor 1 (looseness) ECM
No knock sensor 1 signal to ECM with engine speed, 2,000 rpm or more
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
ECM K1 Knock Sensor 1 1 W
1 EA1
13 E6
W
KNK1
(Shielded) BR EB
A09137
2002 ECHO (RM884U)
Author:
Date:
239
DI-70 DIAGNOSTICS
-
ENGINE
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.
1
Check continuity between terminal KNK1 of ECM connector and body ground. KNK1
LOCK
E6 Connector AB0117 A00285
PREPARATION: (a) Remove the connector cover from the ECM. (b) Disconnect the E6 connector of the ECM. CHECK: Measure resistance between terminal KNK1 of the ECM connector and body ground. OK: Resistance: 1 MΩ or higher
A00255
OK
Go to step 3.
NG
2
Check knock sensor 1 (See page SF-58 ).
NG
Replace knock sensor 1.
OK
3
Check for open and short in harness and connector between ECM and knock sensor 1 (See page IN-29 ).
NG
Repair or replace harness or connector.
OK
2002 ECHO (RM884U)
Author:
Date:
240
DI-71 DIAGNOSTICS
4
-
ENGINE
Does malfunction disappear when a good knock sensor 1 is installed?
YES
Replace knock sensor 1.
NO
Check and replace ECM (See page IN-29 ). Reference: INSPECTION USING OSCILLOSCOPE With the engine racing (4,000 rpm) measure between terminal KNK of the ECM connector and body ground. HINT: The correct waveforms are as shown.
KNK signal waveform 0.5V/ Division 0V
5 m sec./Division 0.5V/ Division
0V
100 sec./Division A00406
Spread the time on the horizontal axis, and confirm that period of the wave is 132 µ sec. (Normal mode vibration frequency of knock sensor: 7.6 kHz)
HINT: If normal mode vibration frequency is not 7.6 kHz the sensor is malfunctioning.
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