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DI-69
DIAGNOSTICS - ENGINE
DI6V9-04
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
S Open or short in knock sensor 1 circuit
No knock sensor 1 signal to ECM with engine speed, 2,000
P0325 S Knock sensor 1 (looseness)
rpm or more
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
ECM
K1
Knock Sensor 1 1 13 KNK1
1 W W
EA1 E6
(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.
PREPARATION:
KNK1
(a) Remove the connector cover from the ECM.
LOCK (b) Disconnect the E6 connector of the ECM.
CHECK:
Measure resistance between terminal KNK1 of the ECM con-
nector and body ground.
OK:
E6 Connector Resistance: 1 M or higher
AB0117
A00285 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 - ENGINE
4 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
KNK signal waveform S With the engine racing (4,000 rpm) measure between ter-
0.5V/ minal KNK of the ECM connector and body ground.
Division
HINT:
The correct waveforms are as shown.
0V
5 m sec./Division
0.5V/
Division
S Spread the time on the horizontal axis, and confirm that
0V period of the wave is 132 ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo