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
2001 Mitsubishi Montero XLS
A/C Control Unit: Montero
2001 Mitsubishi Montero XLSSECTION Montero
- Locate A/C Control Unit (ACCU) on top of evaporator case. Disconnect ACCU 10-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/White wire) is ACCU output. With A/C and blower motor on, battery voltage should be present when ACCU has received signals from pressure and temperature sensors confirming A/C operation is okay.
- Terminal No. 2 (Black wire) is ACCU ground. There should be zero volts at all times.
- Terminal No. 3 (Green/Blue wire) is ACCU power supply when A/C switch is in A/C mode. With ignition and blower on, and A/C switch at second level setting, battery voltage should be present.
- Terminal No. 5 (Green/Red wire) is ACCU power supply when A/C switch is in ECONO mode. With ignition and blower on, and A/C switch at first level setting, battery voltage should be present.
- Terminal No. 7 (Black wire) is ACCU ground. There should be zero volts at all times.
- Turn ignition off. Reconnect 10-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 (White/Blue wire) is air inlet sensor power supply. With ignition, backprobe 10-pin connector with blower and A/C on. Approximately 5.5 volts should be present.
- Terminal No. 8 (Blue/Yellow wire) is air thermosensor signal. When temperature of evaporator outlet port is 77°F (25°C), there should be approximately 3.6 volts present.
- Terminal No. 9 (Yellow/Green wire) is air inlet sensor signal. When temperature of evaporator outlet port is 77°F (25°C), there should be approximately 1.5 volts present.
- Terminal No. 10 (Blue/White wire) is air thermosensor power supply. With ignition, blower and A/C on, approximately 5.5 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.