Once you find the 2000 Protege AC low pressure port cap, hook up the can of refrigerant to the low pressure port. How do you recharge AC in a 2000 Mazda Protege? The low side AC port location is the first thing to find when you are looking for how to put freon in a car. If there is a problem with your compressor or evaporator, adding freon will not restore cooling. The A/C system in your Protege consists of a compressor that is belt-driven, an evaporator and freon. Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a freon. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system. An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting.ĪDDITIONAL INFORMATION: Old PCM is fried, see the attached picture when attempts are made to communicate after fixing the wiring problem.Ĭheck the fuse box (Power Panel), it might be the reason why PCM isn’t able to receive power as well as communicate.Ĥ Easy Steps to Diagnose your Engine Computer (PCM/ECM/ECU Control Module) J2015 Toyota Camry Problems To Keep In Mind FebruCar Engine Computers No Longer the Brains How to Replace a PCM ECM ECU (Engine Computer) on 2003 Dodge Caravan 3.3L Febru2011 Jeep Grand Cherokee Problems AugBad Body Control Module Symptoms To Never Ignore Janu2004 Jeep Grand Cherokee Problems To Keep In Mind FebruHow to Replace a PCM ECM ECU (Engine Computer) on a 2001 Dodge RAM Truck Pick-up FebruThe P0132 Trouble Code, How To Deal With It MaHow Much Does a Powertrain Control Module cost Aug2002 Jeep Liberty 3.7L 56041606AG – PCM ECM ECU Control Module (Engine Computer) Replacement J2005 Ford Escape PCM Problems MaHow to Replace a PCM ECM ECU (Engine Computer) of a 1995 Jeep Grand Cherokee 5.When the air conditioner in your 2000 Mazda Protege starts blowing hot air, you likely have a freon leak. With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity!ĪDDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. With the ignition key ON and no bus activity, BUS + should read 0V BUS should read 5V TEST 5: Connect positive DMM lead to either DLC bias terminals Connect negative DMM lead to the ground terminal This tests the ECM Voltage supply as no power may be caused by a blown lighter fuse With the Ignition on, the voltage on class 2 serial data pin should be 5V or fluctuating between 3.5V and 5.0V, If open, PCM cannot transmit data to the scan tool.Ĭonnect positive DMM lead to DLC Battery + terminal Connect negative DMM lead to battery ground terminal (does not apply to a Mazda MPV)Ĭonnect the positive DMM lead to the class 2 Serial Data pin and the negative DMM lead to either pin 4 or pin 5 or a known good ground NOTE: An open circuit or high ground resistance means that the PCM will never enter diagnostic mode. With the ignition on, the voltage drop across the ground terminal should be 0.1 Volts or less Do not connect to the body or chassis ground but to the battery terminal directly. TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. If the scan tool does not receive data from an OBD II vehicle
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