Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMITSUBISHI2004ECLIPSE L4-2.4L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWDESCRIPTION OF ON-BOARD DIAGNOSTICSON-BOARD DIAGNOSTICS
2004 Mitsubishi Eclipse L4-2.4L SOHC
On-Board Diagnostics
2004 Mitsubishi Eclipse L4-2.4L SOHCSECTION On-Board Diagnostics
ON-BOARD DIAGNOSTICS
The engine control module (ECM) or powertrain control module (PCM) monitors the input/output signals (some signals all the time and others under specified conditions) of the ECM or PCM . When a malfunction continues for a specified time or longer after the irregular signal is initially monitored, the ECM or PCM judges that a malfunction has occurred. After the ECM or PCM first detects a malfunction, a diagnostic trouble code is recorded when the engine is restarted and the same malfunction is re-detected. However, for items marked with a "*," a diagnostic trouble code is recorded on the first detection of the malfunction. There are 86 diagnostic items. The diagnostic results can be read out with a scan tool. Since memorization of the diagnostic trouble codes is backed up directly by the battery, the diagnostic results are memorized even if the ignition key is turned off. The diagnostic trouble codes will, however, be erased when the battery terminal or the ECM or PCM connector is disconnected. In addition, the diagnostic trouble code can also be erased by turning the ignition switch to "ON" position and sending the diagnostic trouble code erase signal from scan tool to the ECM or PCM .
NOTE: If the sensor connector is disconnected with the ignition switch turned on, the diagnostic trouble code is memorized. In this case, send the diagnostic trouble code erase signal to the ECM or PCM in order to erase the diagnostic memory. The 86 diagnostic items are all indicated sequentially from the smallest code number. The ECM or PCM records the engine operating condition when the diagnostic trouble code is set. This data is called "Freeze-frame" date. This data can be read by using the scan tool, and can then be used in simulation tests for troubleshooting. Data items are as follows:
NOTE: If the ECM or PCM detects multiple malfunctions, the ECM or PCM stores the data for only the first item that was detected.
However, if the ECM or PCM detects a misfire or a fuel system malfunction, the ECM or PCM stores the data by giving priority to the misfire or fuel system malfunction, regardless of the order in which the malfunction was detected.
NOTE: As for diagnostic trouble code P1603, "freeze frame" data is not memorized.
The engine control module (ECM)
NOTE: If the sensor connector is disconnected with the ignition switch turned on, the diagnostic trouble code is memorized. In this case, send the diagnostic trouble code erase signal to the ECM
NOTE: If the ECM
However, if the ECM
NOTE: As for diagnostic trouble code P1603, "freeze frame" data is not memorized.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.