Fault phenomenon: oneMitsubishiV6(6G72engine)After the off-road vehicle is overhauled,air conditionerCompressor does not work, condenser fan does not work. Troubleshooting: find the AC compressor first through the circuit (as shown in Figure 1clutchrelayAnd condenser fanrelay, touch the two relays by hand, and turn on AC at the same timeswitchAnd blowerswitch, the relay does not act.Then unplug the two relays, detect that both relays have main fire but no control fire, artificially short circuit the 1-3 pins of the two relays, fan and compressorclutchIt works normally.This proves that there is a problem with their shared control power supply. It can be seen from the circuit diagram that their power supply comes fromair conditionerThe output of pin 1 of the amplifier and pin 1 of the air conditioning amplifier must meet two conditions: ① Air conditioning amplifier works: when the air conditioning switch is turned on, pin 3 or 5 is powered, and pin 6 or 7 is grounded;The temperature control thermistor works normally. ② AC fuse is in good condition. Check that the AC fuse is burnt out.After replacing one fuse, the fuse burned out again when the air conditioner was turned on.Insert the test pen into the fuse, find the 10 pin AC amplifier behind the glove box, unplug the plug, and the test pen light goes out, indicating that the circuit before the AC amplifier is intact, and the short circuit point should be in the circuit and device behind the AC amplifier.Retest AC amplifierWire harnessThe resistance of terminal plug pin l to ground is 0 Ω.In order to narrow the range, unplug the two relays, and the resistance of pin 1 to the ground is still 0 Ω.Then measure the water temperature switch(engineAt the water inlet);The blue-green cable of the plug (leading to the 37 # pin of the main computer) is grounded.Is there a short circuit to ground inside the main computer?Find the main computer on the passenger's side and find the problem: the plug is fastened to the protective bracket, and several wires are broken and grounded.After treatment, the compressor and fan still do not work after re commissioning, and the insurance is in good condition at this time.Re measure that there is no 12V output at pin 1 of AC amplifier.Analysis shows that AC amplifier may be burnt due to grounding of one pin.Remove the AC amplifier and open the case. There is no burn mark on the circuit board.Use a multimeter to measure a PNP power triode at the output end of pin 1, which is burnt out (e-b pole short circuit).Replace a power tube with similar parameters and try the machine again. The compressor and condenser work normally and the fault is eliminated. Fault summary:MitsubishiOff road vehicles have single air conditioning and dual air conditioning systems.V6 (6G72) is a dual air conditioning system.The circuit of Mitsubishi cars is relatively simple, but they have one common feature: the electricity of each unit is controlled by the AC amplifier leg.In the past, this phenomenon is rare, mostly because the fan works normally, but the compressor does not work.This kind of fault is mostly double pressure switch and water temperature switch fault.
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