The 1995 Mitsubishi Eclipse GS, a popular sport coupe, relies on its Powertrain Control Module (PCM) to manage engine functions. When issues arise, the PCM stores diagnostic trouble codes (DTCs), accessible through a scan tool or by manually counting engine light flashes. This article guides you through retrieving and interpreting these codes for a 1995 Mitsubishi Eclipse GS.
Retrieving PCM Codes on a 1995 Mitsubishi Eclipse GS
There are two primary methods for accessing diagnostic trouble codes on a 1995 Mitsubishi Eclipse GS:
1. Using a Scan Tool (MUT-II or General Scan Tool): A scan tool, specifically the Mitsubishi MUT-II or a compatible generic OBD-I scan tool, provides the most straightforward method. Connecting the tool to the vehicle’s diagnostic port allows direct access to stored codes and their corresponding definitions. This is the recommended method for accurate and efficient diagnosis. A 1995 Mitsubishi Eclipse GS requires an OBD1 scan tool.
2. Manual Flash Code Retrieval: If a scan tool isn’t available, codes can be retrieved manually:
- Insert the ignition key.
- Cycle the key ON-OFF-ON-OFF-ON within five seconds.
- Observe the engine light (CEL) for flashes.
- Count the flashes. Each flash sequence represents a two-digit code. A short pause separates the digits within a code, while a longer pause indicates the beginning of the next code.
- The sequence will end with a code 55, signifying the end of stored codes.
Understanding 1995 Mitsubishi Eclipse GS PCM Codes
Once retrieved, the codes need to be interpreted. Below is a partial list of common codes for the 1995 Eclipse GS (Note: This is not an exhaustive list. Consult a repair manual for complete code definitions):
- Code 12: Recent disconnection of power to the PCM. This may occur after battery service or electrical work.
- Code 17: EGR (Exhaust Gas Recirculation) solenoid circuit issue. Potential causes include a faulty solenoid, wiring problems, or a clogged EGR valve.
- Code 21: Issues with the injector control circuit. This could indicate faulty injectors, wiring harness problems, or a PCM malfunction.
- Code 24: Problems with the Throttle Position Sensor (TPS). This might involve a faulty TPS, wiring issues, or incorrect adjustment.
- Code 33: Engine taking too long to reach operating temperature. Possible causes include a malfunctioning coolant temperature sensor, thermostat issues, or cooling system problems.
- Code 41: Generator field not switching correctly. This often points to alternator or wiring issues.
- Code 55: End of codes; no failures detected.
Using the Information for Diagnosis
The retrieved codes provide valuable clues for diagnosing problems. However, they shouldn’t be the sole basis for repairs. Each code represents a potential area of concern, requiring further inspection.
For example, a Code 17 (EGR solenoid circuit) could stem from various issues within that system. Using a multimeter to test the solenoid’s resistance and checking for vacuum leaks are necessary steps to pinpoint the exact problem.
Conclusion
Understanding how to retrieve and interpret PCM codes is crucial for maintaining a 1995 Mitsubishi Eclipse GS. While a dedicated scan tool offers the easiest approach, the manual method provides a viable alternative. Remember that these codes are starting points for diagnosis. Always consult a repair manual and perform thorough testing to confirm the root cause of any problem before replacing parts. Proper diagnosis, using a 1995 Mitsubishi Eclipse Gs Scan Tool or manual code retrieval, is key to efficient repairs.
