What does obd 1 34 mean for a self diagnoses test?

Answer 1

obd 1 code 34= knock sensor

the knock sensor is located underneath the intake manifold bolted into the engine and is hard to see unless with a flashlight.

The knock sensor is 125.00 min to replace and have to search around for one, as they are hard to come across, you may want to check eBay for cheaper ones.

Or, if you want to bypass the Knock sensor you can find the connector for it and install a resistor.

http://www2.zhome.com:81/ZCMnL/PICS/detonationSensor/detonationSensor.HTML

Actually, OBD 1 code 34 means different things for different vehicles. On GM Cars, code 34 is for the MAP sensor, or

Manifold Absolute Pressure Sensor, most often found on the intake manifold, or as in the Saturn S series, the Valve Cover itself. The connector wires are routed to the PCM, or Power Control Module, and depending on the vehicle, located usually under the dash.

GM Trouble Code 34 indicates that the Manifold Absolute Pressure (MAP) sensor is detecting unusually high vacuum in the manifold. Code 34 will get set when:

? Engine RPM less than 700.

? Manifold pressure reading less than 13 kPa.

? Conditions met for .22 second.

OR

? Engine RPM greater than 700.

? Throttle angle over 20%.

? Manifold pressure less than 13 kPa.

? Conditions met for .22 second.

Possible causes include:

1. Faulty MAP-to-ECM connection

2. Defective MAP sensor

3. Defective ECM

Check the shop manual for details on vehicle specific MAP sensor applications.

*You can find more info on the AUTOZONE.COM website, easy to use and understand, it's free and has priceless diagrams and repair info for most cars and trucks...