Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0325p
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DI-62
DIAGNOSTICS - ENGINE
DI226-03
DTC P0325 Knock Sensor 1 Circuit Malfunction
DTC P0330 Knock Sensor 2 Circuit Malfunction
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)
2,000 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)
2,000 rpm and 5,600 rpm.
S ECM
If the ECM detects the 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
3
EA1
Knock Sensor 1
(On right bank)
1 27 KNKR
1 W W
EA1 E12
A
J14 4
A E1
J/C EA1
Knock Sensor 2
A (On left bank)
2 28 KNKL
1 W W
EA1 E12
BR
E1
EC
A09082
INSPECTION PROCEDURE
HINT:
S DTC P0325 is for the right bank knock sensor circuit. DTC P0330 is for the left bank knock sensor cir-
cuit.
2001 SIENNA (RM787U)
Author : Date : 216
DI-63
DIAGNOSTICS - ENGINE
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 warmed up or not, the air-fuel
ratio 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:
ECM (a) Connect the OBD II scan tool or TOYOTA hand-held tes-
ter to the DLC3.
Knock Sensor EC1
27 KNKR
(b) Disconnect the wire to wire connector EC1.
1 1 1
E12 (c) Connect the terminals of the disconnected EC1 male con-
nector and EC1 female as follows.
28 KNKL
1 Male connector Female connector
E12
2 2
Male Female Terminal 1 Terminal 2
Connector Connector Terminal 2 Terminal 1
(d) Turn the ignition switch ON and push the OBD II scan tool
or TOYOTA hand-held tester main switch ON.
EC1 (e) After the engine is warmed up, perform quick racing to
4,000 rpm three times.
CHECK:
Check the DTC.
RESULT:
DTC same as when vehicle brought in.
Type I
P0325 P0325 or P0330 P0330
A00304
DTC different to when vehicle brought in.
Type II
P0325 P0330 or P0330 P0325
KNK Signal Waveforms
Reference INSPECTION USING OSCILLOSCOPE
0.5 V
/Division S With the engine racing (4,000 rpm), measure between
terminals KNKR, KNKL of the ECM connector and body
ground.
0V
HINT:
The correct waveforms are as shown.
5 msec./Division
200 mV
/Division S Spread the time on the horizontal axis, and confirm that
period of the wave is 141 ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo