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DI-63
DIAGNOSTICS - ENGINE (5VZ-FE)
DI0S4-1 1
DTC P0325 Knock Sensor 1 Circuit Malfunction (Bank 1)
DTC P0330 Knock Sensor 2 Circuit Malfunction (Bank 2)
CIRCUIT DESCRIPTION
Knock sensors are fitted one to the right bank and left bank of 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 Detecting Condition Trouble Area
S Open or short in knock sensor 1 circuit
No knock sensor 1 signal to ECM with engine speed between
P0325 S Knock sensor 1 (looseness)
2000 rpm and 5,600 rpm
S ECM
S Open or short in knock sensor 2 circuit
No knock sensor 2 signal to ECM with engine speed between
P0330 S Knock sensor 2 (looseness)
2000 rpm and 5,600 rpm
S ECM
WIRING DIAGRAM
K2 ECM
Knock Sensor 1
(on Right Bank) 1 23
B B KNK1
EB1 E9
1
E1
K3
Knock Sensor 2
(on Left Bank) 2 22
GR GR KNK2
EB1 E9
1
E1
A03381
INSPECTION PROCEDURE
HINT:
S DTC P0325 is for the right bank knock sensor circuit.
S DTC P0330 is for the left bank knock sensor circuit.
2002 4RUNNER (RM887U)
Author : Date : 239
DI-64
DIAGNOSTICS - ENGINE (5VZ-FE)
S 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 was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
1 Connect OBD II scan tool or TOYOTA hand-held tester, and check knock sensor
circuit.
PREPARATION:
EB1 (a) Connect the OBD II scan tool or TOYOTA hand-held tes-
ECM
Knock Sensor ter to the DLC3.
1 1 27 KNK1
E9 (b) Disconnect the EB1 connector.
(c) Connect the terminals of the disconnected EB1 male con-
28 KNK2
nector and EB1 female as follows.
E9
22 Male connector Female connector
Female Male Terminal 1 Terminal 2
Connector Connector Terminal 2 Terminal 1
EB1
(d) Turn the ignition switch ON and push the OBDII scan tool
or TOYOTA hand-held tester main switch ON.
(e) After the engine is warmed up, perform quick racing to
4,000 rpm 3 times.
CHECK:
Check the DTC.
RESULT:
A03539
DTC same as when vehicle brought in
Type I
A00053 P0325 P0325 or P0330 P0330
A00054 A03394
DTC different to when vehicle brought in
Type II
P0325 P0330 or P0330 P0325
KNK Signal Waveform Reference: INSPECTION USING OSCILLOSCOPE
0.5V S With the engine racing (4,000 rpm), check the waveform
/Division between terminals KNK1, KNK2 of the ECM connector
and body ground.
0V HINT:
The correct waveform is as shown.
5 msec./Division
200mV S Spread the time on the horizontal axis, and confirm that
/Division
period of the wave is 0.141 msec. (Normal mode vibration
frequency of knock sensor: 7.1 kHz)
0V HINT:
If normal mode vibration frequency is not 7.1 kHz, the sensor
is malfunctioning.
FI6510 0.1 msec./Division Type II Go to step 3.
FI6607 A00113
2002 4RUNNER (RM887U)
Author : Date : 240
DI-65
DIAGNOSTICS - ENGINE (5VZ-FE)
Type I
2 Check for open and short in harness and connector between EB1 connector and
ECM (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28 ).
3 Check for open and short in harness and connector between EB1 connector and
knock sensor (See page IN-28 ).
HINT:
S If DTC P0325 has changed to P0330, check the knock sensor circuit on the right bank side.
S If DTC P0330 has changed to P0325, check the knock sensor circuit on the left bank side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.
2002 4RUNNER (RM887U)
Author : Date : 241
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