Re: Toyota OBD-1 Trouble Code 55 on a 1993 3vzFE V6 (Camry)
From the internet, take it for what it's worth:
"The code 55 you are getting, in Toyota terms, as as follows:
"No number one knock sensor signal to the ECU for four crank revolutions under these 2 conditions: Coolant temperature 140 degrees F or more; Engine speed between 1600 and 5200 RPM."
This indicates a failed (or a loose) knock sensor on the Right Bank of the engine. Since the knock sensor is basically a piezo-electric crystal, no continuity test can be performed with the intake manifold installed.
You can check the continuity form the Knock Sensor wires to the ECM, but, this may not prove useful to you.
Unfortunately, you are going to have to pull the intake, and check the knock sensor wiring integrity. If the connector is good, and the sensor is tight, I would suggest replacing the sensor. Actually, if you were in my shop, I would suggest replacing them both, as the whole intake will have to come off if the other sensor fails. Better to replace them both at once, than to pull the intake again."
<and>
"The 55 trouble code is for knock sensor malfunction on the right bank of the engine which would be the one near the firewall, there are two sensors one for each cylinder bank, were any of them replaced if not I would recommend replacing them both along with the wire sub-harness while the intake manifold is off. "
