Question about 1990 Plymouth Horizon
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Posted on Jan 02, 2017
The speedometer went out at 50,000 miles. The head gasket blew at 125,000 miles. I bought this car new when I started college, and it was the best front-wheel drive car I ever owned. The speedometer went at about 50,000 miles. I traced it to the printed circuit board, but Chrysler didn't carry the part, so I guessed my speed based on what gear I was in and my tachometer reading.
Posted on May 14, 2008
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
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