The oxygen sensor is located in the exhaust.īy detecting the amount of oxygen in the exhaust gases, the oxygen sensor provides the information needed to ensure engine efficiency.
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Source: How to Test Automotive Oxygen Sensors Infinite resistance indicates a burnt out sensor. The meter should read 0 ohms or close to that. To check for resistance, set the DVOM read ohms, then unplug the sensor.Ĭonnect one of the meter’s probe to the signal terminal of the MSF sensor and the other to ground. The readings should change accordingly, reaching up to 2 volts. Observe the readings, which should range 0.2 to 1.5 volts. Switch on the ignition but do not start the engine. They will usually be indicated as SIG and GND respectively. Reattach the sensor and identify the signal and power terminals. The meter reading should indicate a value close to the battery voltage or from between 10 to 13 volts. Unplug the sensor and connect the meter probes to the harness terminals- the negative to GND and the positive to B+. To test if the sensor is receiving power, set your DVOM to 20V DC. Inspect it for damage, dirt, or loose connections. Locate the sensor in the vehicle’s air intake duct. The signs that it has failed include misfires or the car stalling. Usually located in the area between the air filter and the throttle body, the MAF sensor helps the car computer to control engine performance. This sensor measures the amount of air entering the engine as well as its density. If the readings are zero Ohms, the sensor is shorted. If the resistance is infinite, you have an open circuit within the sensor. If they don’t match, the sensor is defective. Read the Ohm or resistance values and compare them to those of the manufacturer. Unplug the sensor and connect either leads to the DVOM probes. To test for resistance, set the DVOM to Ohms scale. The voltage should be within the manufacturer values, usually 200mv. Turn on the ignition without starting the engine.Ĭonnect the DVOM positive probe to one of the sensor connectors and the other probe to ground. Set the digital volt ohm meter to read millivolts. Inspect the sensor for visual signs of damage such as worn insulation or loose and damaged connectors or mounting bolts. Testing them for failure involves measuring voltage output and resistance then matching the results with those of the manufacturer. When the sensor fails, it can mean the engine performing poorly or even stalling.Ĭrankshaft or camshaft position sensors usually come with voltage or resistance specifications. This is important for the ECU to determine the timing of engine operations, such as fuel injection. The crankshaft position sensor continuously measures the rotational speed and position of the crankshaft.
Source: How to Test Automotive Crankshaft or Camshaft Position Sensor You may want to have an infrared thermometer with you or a scan tool to display testing data.įor proper testing results, ensure the battery is in perfect condition- fully charged and its connections intact and routed correctly These are the main testing tools testing required but you can equip yourself with extra ones if possible.
Jumper leads are also necessary for some tests.
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