Question about 1991 Toyota Pickup

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Check engine light tells me knock sensor or circut ecu

Where is knock sensor ,how do you check it?

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  • kelvin smotherman May 11, 2010




    what engine do you have 4 cly or 6cly





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On a 6 cylinder, the knock sensor is located under the intake manifold, on the inside edge of the cylinder block. You must remove the entire intake manifold assembly to access the knock sensor. If you are replacing it, it would be very advisable to replace the sensor AND the extension wire from it to the main harness. I have observed that the wire extensions become brittle over time, and they fail with regularity.

Posted on Dec 08, 2008

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1 Answer

Rattling noises when lightly accelerating


A light rattle is often 'pinging' or pre-detonation caused by using fuel of too low an octane rating. The puzzling thing here is that the knock sensor should send a signal to the car's computer (ECU) to cause it to adjust the ignition timing.

- is the check engine light blinking? If so get a readout of the trouble code held by the ECU, from a mechanic.
- fill up with fuel of a higher octane rating such as premium unleaded to see if that makes a difference. If so, have a mechanic check the knock sensor.
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Mar 22, 2016 | 2000 Nissan Altima

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Bad knock engine


Have you had it scanned? It might be something as simple as a bad knock sensor which is not telling your ECU (car's engine management computer) that it needs to back off it's timing. Get it scanned.

Feb 27, 2015 | 2007 Chevrolet Epica 2.0

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Toyota 4runner 1994 engine codes 12,52,71 what are these


Code 12 Engine revolution signal missing
Code 52 Knock sensor fault
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May 04, 2011 | Toyota 4Runner Cars & Trucks

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I have a code p0325 knock sensor 1, circuit bank 1 or single sensor problem


A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block.

This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.

Symptoms: You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.

Causes: A code P0325 most likely means one or more of the following has happened:
* The knock sensor is faulty and needs to be replaced
* There is a wiring short/fault in the knock sensor circuit

Possible Solutions
* Check the resistance of the knock sensor (compare it to factory specs)
* Check for broken/frayed wires leading to the sensor
* Replace the knock sensor


Test it and tell us news.

Mar 15, 2011 | 1999 Nissan Maxima

1 Answer

Service engine light on. Problem identified as P0332 Knock Sensor 2 Circut Low Input Bank 2


P0332 GM

Knock sensor circuit low voltage bank 2
- The ECM detects a KS signal voltage that is less than typical engine noise level for at least 4 seconds

Probable Cause[s]

  1. Open or short circuit condition
  2. Poor electrical connection
  3. Knock sensor
  4. ECM fault

Mar 13, 2011 | 2003 Chevrolet TrailBlazer

3 Answers

Onley firin on 2 clynders


I would check the injectors for each cylinder, and check for spark in each cylinder.

If the injectors are not firing in all cylinders, it may be a computer.

If spark occurs in some but not all cylinders, it could be an ignition coil.

DISTRIBUTORLESS IGNITION SYSTEM General Information A distributorless ignition system is used on all 2.2L and 2.5L models. The system consists of a cam and crankshaft angle sensor, knock sensor, two ignition coils, an Electronic Control Unit (ECU) and assorted sensors. The system control features a quick response learning control method that compares data stored in the ECU memory to data received from the sensors. Thus, the ECU constantly provides the optimum ignition timing in relation to output, fuel consumption, exhaust gas and other variables. The ECU receives signals from the airflow sensor, water temperature sensor, crank angle sensor, cam angle sensor, knock sensor and other various indicators to judge the operating condition of the engine. It then selects the optimum ignition timing stored in the memory and immediately transmits a primary current OFF signal to the igniter to control the ignition timing. The ECU also receives signals emitted from the knock sensor. Ignition timing is controlled so that advanced ignition timing is maintained immediately before engine knock occurs. Two ignition coils are used, one for the No. 1 and No. 2 cylinders, and one for the No. 3 and No. 4 cylinders. A simultaneous ignition type is employed for each bank of cylinders. This eliminates the distributor and achieves maintenance free operation. Ignition control under normal conditions is performed by the ECU measuring engine revolutions. Using the data it receives, the ECU decides the ignition timing according to engine operation. Ignition control under starting conditions is set by the ECU at 10°BTDC. prev.gif next.gif

Sep 02, 2010 | 1995 Subaru Impreza

1 Answer

93 buick no start 3.3 no check engine light. code43 knock sensor. checked for power at knock sensor none. replaced ecu. checked all fuses all good has spark. will fire if spray in throttle body .


Sounds more like you have a bad fuel pump.If you have a pressure tester then check the fuel pressure.You need top have between 41-47 psi fuel pressure.

Nov 22, 2009 | 1993 Buick Century

1 Answer

Check engine light tells me knock sensor or circut or ecu.


on a v-6, the knock sensor is located under the intake manifold assembly, on the inner edge of the cylinder block.

Dec 07, 2008 | 1991 Toyota Pickup

1 Answer

Knock sensor circuit problem


Well, you have another issue besides a knock sensor problem. A knock sensor code WILL NOT illuminate the check engine light. Check for other codes stored in the ECU. I have seen oxygen sensor issues cause knock sensor issues due to inaccurate fuel delivery resulting in engine ping at all times (causing the ECU to think that the knock sensor is bad because it's reporting ping at all times) - but also had codes for one or more O2 sensors.

Nissan Scope Technician- 10 years with Nissan

Oct 26, 2008 | 2000 Nissan Frontier

2 Answers

Check light


When a check engine light comes on you have to have someone plug in a OBD reader to turn the light off. One way you can do it is if you remove the negative battery cable from the battery for about 5 min to reset the ECU. This doesn't always work for every car. My suggestion is the OBD reader, it can also tell you if there is another ploblem not just the oil being low.

Aug 12, 2008 | 2000 Toyota Camry

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