To use the On-Board Diagnostics (OBD) system on a 1989 Plymouth Voyager, you typically need to connect an OBD-I scanner to the diagnostic connector, which is usually located under the dashboard near the driver's seat. The scanner will read any trouble codes stored in the vehicle's computer, which can help diagnose issues with the engine or other systems. After connecting the scanner, follow the manufacturer's instructions to retrieve and interpret the codes. Keep in mind that OBD-I systems may have limited functionality compared to newer OBD-II systems.
Under the dash board I think.
my opinion-if it is designed for 87 use 89.
89 = 88 + (8 / 8)
With a bit of a cheat: 88 + 8/8 = 89
88 + 8/8 = 88 +1 = 89
In a 1989 Jeep Wagoneer, the OBD (On-Board Diagnostics) connection is typically located under the dashboard on the driver's side. You may need to look near the steering column or under the instrument panel. However, it’s important to note that vehicles from this era often do not have a standardized OBD-II port, as the OBD-II system was introduced in 1996. Instead, you may find a different diagnostic connector or may need to use a specific service manual for troubleshooting.
You can use either octane range of 87 to 89. But Daimler-Chrysler recommends to use 89 octane for optimum performance.
The electronic control module is located behind the right side of the dash board
88 + 8/888 + 8/8 = 89
61 = 89
The diagnostic port on a 1989 Honda Civic is found in the front of the engine bay. The wire harness will have and extra clip in front of the passenger side of the firewall. This is where a computer can be plugged in to check for codes.
It is so easy and so much faster when you use your own calculator: 89*97 = 8633