1. Retrieve Diagnostic Trouble Codes (DTCs):
Onboard Diagnostics Device: Check if your car has an onboard diagnostics device (OBD) that allows you to retrieve DTCs. In 1995 Volvo 940s, the OBD-I system may be present.
2. OBD-I Interface Connector:
Locate the OBD-I interface connector under the dashboard, usually near the steering column or center console. It has 16 pins and a plastic cover.
3. Check Engine Light:
Start the engine and turn the ignition key on and off three times, leaving the key on the third time. This may cause the "Check Engine" or "Service Engine Soon" light to blink or flash. Count the blinks to get the first part of the code. Repeat the process to receive additional digits of the code.
- A pause between blinks indicates a separation between codes.
- Long blinks represent the first digit, and shorter blinks represent the second digit of a two-digit code.
4. Interpret Codes:
Once you have the complete trouble codes, consult a Volvo fault code reference guide to understand the meaning of each code and the probable cause of the issue.
5. Repair Shop Manual (Optional):
If you want more detailed instructions and possible solutions, obtain a Volvo 940 repair shop manual or service guide. It may contain specific diagnostic steps and component testing procedures for your car model.
6. Seek Professional Assistance:
If you face difficulties interpreting the codes or require repairs beyond your comfort level, it may be best to seek assistance from a qualified automotive repair technician.
Note: The diagnostic codes obtained this way are generic OBD-I codes and may not provide model-specific information or manufacturer-specific codes. For a more thorough diagnosis, Volvo-specific diagnostic tools or professional equipment may be required.
