Knock Sensor Circuit

[jonathanvb]

I have just done the engine diagonos thing and in the two series of flashes the first had 4 and the second had 3 which means the code is 43

I matched this and the problem was
Code 43 - Knock Sensor Circuit


I am just wondering if this is a problem and how it can be fixed


Thanks, Jonathan

[Doctor Bob]

what model car, what engine etc??

[jonathanvb]

1991 VN, V6 3.8 ltr

[Doctor Bob]

check the wire from the knock sensor to the ECM for continuity, if thats ok & the knock sensor is ok & torqued correctly the ECM is faulty.

Rob

[jonathanvb]

Where do i find the knock sensor and the ECM?

[Doctor Bob]

No offence but take it to a dealer or someone who knows what theyre doing.

[defa]

check the wire from the knock sensor to the ECM for continuity, if thats ok & the knock sensor is ok & torqued correctly the ECM is faulty.

Rob

i didn't realised they had to be torqued properly.. i replaced mine a month ago and just did it till it was farely firm. there isn't any drama's that can happen if it is screwed in too much or not enough is there....

[Doctor Bob]

i didn't realised they had to be torqued properly.. i replaced mine a month ago and just did it till it was farely firm. there isn't any drama's that can happen if it is screwed in too much or not enough is there....

if they are too tight they will be too sensitive & react to any small noise in the engine, too loose & they will be no use at all.
ALL threaded items on cars have a torque, & its there for a reason, sometimes to ensure the part its holding on doesnt fall off & sometimes for correct operation

Rob

[peter65]

From the book of words.....
1) the resistance of the knock sensor (sensor terminal to earth) should be 3000 to 5000 ohms.

2) if the sensor resistance is ok, check the voltage at the harness (should be 4 to 6v) - i guess with the ignition on (but the book does not specify). If it is not in this range, check the wiring (white/red) back to b11 of the ECU. if the voltage is between 4 to 6v, check the wiring for chafing due to engine vibration.

3) if no faults are found, renew the ECU.

the book says to tighten the sensor to the correct torque... but i am blowed if i can find where it says what the correct torque is.....

Notes:
1. dont drop or knock the sensor. it is easily damaged... and expensive.
2. to remove the wire from the sensor, squeeze the wide sides of the connector.

cheers peter.

[vt1538]

Knock sensor torque is 16 to 21 nm.