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Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14505
Experience:  Toyota Master Diagnostic
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97 toyota camry: knock sensor..sensor wire harness and ecm - mil

Customer Question

97 toyota camry - knock sensor codes po325 and po330. has new knock sensors, knock sensor wire harness and ecm - mil still stays on? possible causes
Submitted: 6 years ago.
Category: Toyota
Expert:  Pavlin Koev replied 6 years ago.

Pavlin Koev :

.Hi and Welcome to JustAnswer! My name is XXXXX XXXXX I will do my best to help.

Pavlin Koev :

engine vibration will cause knock sensor to send signal.

Pavlin Koev :

check engine mounts, exhaust, any unusual noise or detonating noise from regular fuel.

Expert:  Skyvisions replied 6 years ago.

Thank you for choosing JustAnswer and allowing me to help you resolve your Toyota questions!


WRONG!! These codes will not set by excessive engine vibration or knock! They are designed to detect such things and adjust the timing accordingly. These codes mean there is no signal input when the engine speed reaches 2,000 to 5,600 rpm. This can only be caused by shorts or opens in the harness, sensors and so on. If you have the proper test equipment I can assist you further.



Customer: replied 6 years ago.
what type of equipment do i need i have a genysis. test lights and such. only thing i dont have is an occiloscope.
Expert:  Skyvisions replied 6 years ago.

Scope is ideal but do you have an ohmmeter and good understanding of how to use it? Do you have a wiring diagram? Where did you get the sensors from? Some history on the car leading up to this problem?



Customer: replied 6 years ago.
yes have a wiring diagram. no driving issues. run smooth. mil came on 3 weeks ago. took it local dealer said knock sensor bank 1 bad. suggested doing both and harnesss as already in there. so did that. knock sensors came from autozone. harness direct from toyota and ecm from l.k.q. dealer reflash ecm and said working fine. drives great mil came back after 80 miles.
Expert:  Skyvisions replied 6 years ago.

Glad to hear it is the Toyota sub harness. Sad to hear the Auto Zone sensors have had issues with these aftermarket ones and due to the pain in the arss in getting to them I never us anything but Toyota ones. This being said you need to rule out issues with the harness from the connector at the sub harness back to the computer. These input wires from the sensors are ground shielded. On some rare occasions I have seen the shielding short to the signal wire when hot. I have never seen an ECU go bad for these probably nothing wrong with yours. To rule out any issues with the harness what I have done is made a sub harness using shielded wire from radio shack and go from the connector to the ECU and clip the 2 input wires at the ecu, far enough back so you can reconnect the wires with soldier. I take the pins out but you are not going to have the tool to remove the locks on the connector. Run the wire into the computer and drive for awhile to see if there is a problem if the light comes on then this only leaves the sensors as the problem. The second check or test is to disconnect the the connectors at the computer and at the sub harness and ohm test the center signal wire to ground there should be no resistance to ground of any kind. This is not a guarantee because if the problem is intermittent or heat sensitive it may not show up unless you have a mega ohm tester. Let me know what you find.