Help... Two (2) questions that I hope someone can answer? 1) Just replaced my V6 engine in my 91 4Runner and now I'm showing a knock sensor code (5/2). What do I have to do inorder to fix the problem? 2) Mounted on the radiator bracket, next to the A/C accumulator is an item that is:
2" x 1/8"x 1/8" with a wire attached at each end and is connected to the same wire harness of the A/C. It looks like some type of fuse. What's the reason for that item? Thanks
You will need to replace the knock sensors and wires, very common to set that code off once that area has been disturbed for repair.
2nd. I believe you are describing an ambient air temp sensor.
Confused... When the code shows trouble with the knock sensor, does this mean the knock sensor is bad or the knock sensor detects a knock/miss in the engine?
OK, the knock sensor isnt really a sensor at all, it is a microphone and is usually bolted hi in the block or in the head area, GM puts them low in the block because I guess its cheaper. When the motor is running, the ecu hears it and all is well, but when it doesnt hear anything and its seeing an rpm signal, it flings a complaint
The ECU's won't throw a knock sensor code for actual knocking.
They simply retard ignition timing more and more until the knock goes away, then it starts adding timing back until it's at base timing, or knocking comes back.
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When you throw a code, it's normally at startup. If the ECU doesn't see any signal (engine noise) for 90 seconds, it'll throw a code. It's either the wire or the sensor isn't screwed in tight.
The knock sensor is fitted to 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.
For the 1MZ FE (my 98 Sienna), if no signal from the knock sensor(s) to ECM with engine speed between 2,000 rpm and 5,600 rpm, you will get one or both of these codes;
DTC P0325 Knock Sensor 1 Circuit Malfunction (right bank – firewall side)
DTC P0330 Knock Sensor 2 Circuit Malfunction (left bank – radiator side
When you get these codes, the ECM will operate in fail-safe mode to protect the engine. You will notice that your vehicle will not accelerate like it used to be.
code 52 is obd I toyota code. P codes are for obd II compliant vehicles(96 and up.)
all it means is you have a short or open in the ksensor circuit. if the harness is ok and it's plugged in after installing the new engine, then it's most likely a bad sensor. clear the code first. if you get a cel and get the same code(52), then replace the sensor.
I have a 91 runner v6 with a 52 code and have changed the KS & the wire and still have the code. I have checked continuity to the KS pin on the ECM and it has continuity. Do I need a new ECM?
Today I will run new RG-58 wire from the ECM to the new KS which I have mounted on the Dr. side rear engine hanger (as desribed in another thread). Wish me luck. I will come back and tell you what happened.
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