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.
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HOMESERVICE MANUALSMITSUBISHI1990PRECIS BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSYSTEM DIAGNOSISENTERING ON-BOARD DIAGNOSTICS (USING DRB-II)STATE DISPLAYS
1990 Mitsubishi Precis Base, Standard
State Displays
1990 Mitsubishi Precis Base, StandardSECTION State Displays
- This allows technician to view conditions at signal level. The 2 types of signals are analog and digital. Analog signals are monitored at pins corresponding to vehicle harness splices (e.g. fuel pump relay).
- Digital signals correspond to data transmitted by the system controllers. Both signals are displayed in common units (e.g. temperature). Use up and down arrow keys on DRB-II to scroll through displays available.
- The following ENGINE state displays are available on DRB-II:
- Module Information
This mode allows technician to read ECU part number and application. - Engine Sensors
This mode allows technician to look at various engine sensors during engine operation. - Inputs/Outputs
This mode allows technician to read input and output states of various switches and sensors. - Custom Display
This screen allows technician to set up his/her own custom display. Two custom display screens can be programmed into DRB-II. - Minimum/Current/Maximum
The MIN/CURRENT/MAX display shows a history of conditions for a specific sensor. When this option is selected, maximum, current (static) and minimum values can be displayed for a specific sensor. To reset sensors to a zero value, simply press ENTER key. This display may be used to isolate intermittent faults. The MIN/CURRENT/MAX display allows technician to observe operation of 6 different sensor values. Information is displayed as a 3-digit number. The first value displayed is the minimum reading, the second number is the current reading and third valve is the maximum reading. Typically sensors range between 2-252. Values less than 2 or greater than 252 will usually indicate that a sensor is shorted or disconnected. Watch minimum and maximum values to help diagnose intermittent problems. - Monitors
This screen shows technician sensors and system controllers which affect fuel control, spark advance, RPM and A/C relay. There are 4 different screens available. As an example, screen No. 1 will show: airflow sensor, O2 sensor, battery and fuel injector. All of these inputs affect fuel control.
- Module Information
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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.