Question about 1990 Plymouth Horizon
I did the engine code test and got back 3-4 anyone know what it means?
Code 34 is set when the computer does not detect a voltage to and through the speed control servo. The cruise control computer is built into the PCM, which grounds two windings in the servo mechanism to regulate the vacuum applied to the servo diaphragm.
Note: All Chrysler corporation fuel-injected engines have the computer circuitry and software for the cruise control system installed, even if there is no cruise control installed on the vehicle. If there is no cruise control installed on the care or truck, the computer will interpret this as an open winding and set code 34.
First: turn the key ON, turn the cruise switch ON, and look for +12 Volts on the dark blue/red wire that connects to the servo mechanism. This circuit is fed:
If no wiring problems are found, check the PCM connectors for corrosion, and reconnect. Reconnect the battery and test the circuit again. If the problem still exists, the PCM is probably bad. NOTE: Personally, if the truck was out of warranty I would try to find for a used servo before buying a new PCM.
Posted on Oct 16, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Apr 17, 2011 | 1996 Plymouth Breeze
Apr 13, 2011 | 1989 Plymouth Horizon America
Oct 18, 2009 | 1989 Plymouth Voyager
Sep 11, 2009 | 1996 Plymouth Voyager
Jun 04, 2009 | 1999 Plymouth Voyager
Mar 16, 2009 | 1989 Plymouth Horizon America
May 14, 2008 | 1989 Plymouth Horizon America
406 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: