2001 Toyota Sienna Knock Sensor Failure ????

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jmrec100
Enthusiast | Posts: 273 | Joined: 09/10

Posted: 09/10/12
06:32 PM

My friend's 2001 Toyota Sienna , V6 3.0L Failed smog. Trouble code P0330. Some references are talking about the Knock sensor Circuit. There are 2 in this vehicle. Now where are they. The diagrams I have are not that clear where to look.
And could there be another problem?

waynep71222
Guru | Posts: 825 | Joined: 03/12

Posted: 09/10/12
07:32 PM

CIRCUIT DESCRIPTION

Knock sensors are fitted one each 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.

P0325
No knock sensor 1 signal to ECM with engine
speed 2,000 rpm or more.
• Open or short in knock sensor 1 circuit.
• Knock sensor 1 (looseness).
• ECM

P0330
• Open or short in knock sensor 2 circuit.
• Knock sensor 2 (looseness).
• ECM
No knock sensor 2 signal to ECM with engine
speed 2,000 rpm or more.
Diagnostic Trouble Code Detecting Condition

Trouble Area

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.

knock sensor 1 is on the right bank , white wire to ECM connector E8 pin 15
knock sensor 2 is on the left bank. white wire to ECM connector E8 pin 14.
there is a connection under the hood with connector designition EE1.. pins 1 and pin 2 for s1 and s2
ee1 is a 4 pin square connector.. only pins 1 and 2 are used for the knock sensor..

below the test says to use short jumpers to move pin 1 to pin 2 and pin 2 to pin 1.. so you can see if the sensor is bad.. or the computer..

(1) Remove the fuse cover on the instrument
panel.

(2) Connect the OBDII scan tool or TOYOTA
hand–held tester to the DLC 3.

(3) Disconnect the wire to wire connector EE1.

(4) Connect the terminals of the disconnected
EE1 male connector and EE1 female as follows.

(5) Turn ignition switch ON and OBDII scan tool
or TOYOTA hand–held tester main switch
ON.

(6) After the engine is warmed up, perform quick
racing (4,000 rpm) three times.
Check the diagnostic trouble code.

Connect the OBDII scan tool or TOYOTA hand–held tester and
check the knock sensor circuit.

Check for open and short in harness and connector between EE1
connector and ECM (See page IN–31).

did the trouble codes reverse.. P0300 to a P0335 or the other way...

DTC same as when vehicle brought in.
P0325" P0325 or P0330" P0330

DTC different to when vehicle brought in.
P0325" P0330 or P0330" P0325

(Normal mode vibration frequency of knock sensor: 7.1 kHz)
HINT: If normal mode vibration frequency is not 7.1 kHz, the sensor is malfunctioning.