Toyota Weather Radio P0325 User Manual

DI–71  
DIAGNOSTICS  
ENGINE  
DI38A–03  
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.  
DTCDetectingCondition  
TroubleArea  
S Open or short in knock sensor 1 circuit  
S Knock sensor 1 (looseness)  
S ECM  
No knock sensor 1 signal to ECM with engine speed, 2,000  
rpm or more  
P0325  
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  
27  
E5  
1
EB1  
W
KNK1  
W
A
(Shielded)  
J1  
J/C  
1
A
BR  
K1  
Knock Sensor  
ED  
A09120  
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.  
2000 CELICA (RM744U)  
 
 
DI–73  
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–30).  
Reference: INSPECTION USING OSCILLOSCOPE  
KNK signal waveform  
S
With the engine racing (4,000 rpm) measure between ter-  
minal KNK of the ECM connector and body ground.  
0.5V/  
Division  
HINT:  
The correct waveforms are as shown.  
0V  
S
Spread the time on the horizontal axis, and confirm that  
period of the wave is 80 µ sec.  
5 m sec./Division  
(Normal mode vibration frequency of knock sensor:  
12.5 kHz (1ZZ–FE), 7.1 kHz (2ZZ–GE))  
0.5V/  
Division  
HINT:  
If normal mode vibration frequency is not 7.6 kHz the sensor is  
malfunctioning.  
0V  
100 sec./Division  
A00406  
2000 CELICA (RM744U)  
 

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