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 MANUALSMITSUBISHI2001MONTERO XLSREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSMANUAL A/C-HEATER SYSTEMSSYSTEM TESTSA/C CONTROL UNITMONTERO SPORT
2001 Mitsubishi Montero XLS
Montero Sport
2001 Mitsubishi Montero XLSSECTION Montero Sport
- Locate A/C Control Unit (ACCU) on top of evaporator case. Disconnect ACCU 20-pin connector. Inspect connector and wiring for damage. Turn ignition and A/C on. Set temperature control to maximum cooling and blower switch to high. Using a DVOM set to appropriate test function, inspect harness side of connector. See Fig 1. If all test readings in the following steps are as specified, replace ACCU.
- Terminal No. 1 (Blue/Red wire) is ACCU power supply. When ignition is on battery voltage should be present.
- Terminal No. 2 (Blue/Black wire) is ACCU switch input. When A/C or blower switch is off, no voltage should be present. When A/C, blower and ignition switches are on, battery voltage should be present.
- Terminal 8 (Black wires) are ACCU grounds. There should be zero volts at all times.
- Terminal No. 18 (Red/Black wire) is ACCU backup power supply. Battery voltage should be present at all times.
- Turn ignition off. Reconnect 20-pin connector. Turn ignition on. Turn A/C on. Set temperature control to maximum cooling and blower switch to high. If all test readings in the following steps are as specified, replace ACCU.
- Terminal No. 4 (Blue/Black wire) is A/C output. With A/C compressor relay off, backprobe 20-pin connector, no voltage should be present. With A/C compressor relay on, battery voltage should be present.
- Terminal No. 14 (Yellow/Red wire) is air thermosensor power supply and should be 4.8-5.2 volts at all times.
- Terminal No. 15 (Yellow wire) is air thermosensor return signal. With sensor temperature at 77°F (25°C), approximately 2.3-2.9 volts should be present.
- Terminal No. 16 (Black/Blue wire) is outside air temperature sensor power supply and should be 4.8-5.2 volts at all times.
- Terminal No. 17 (Yellow/Blue wire) is outside air temperature sensor input. With sensor temperature at 77°F (25°C), approximately 2.3-2.9 volts should be present.
- Terminal No. 19 (Yellow/White wire) is ambient sensor signal to Engine Control Module (ECM). With sensor temperature at 52°F (15°C), battery voltage should be present. With sensor temperature at 64°F (18°C), approximately 2 volts should be present.
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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.